pango: vendor as full-fork recipe (path=source, patches baked)
This commit is contained in:
@@ -3,9 +3,14 @@ name = "pango"
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version = "1.56"
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[source]
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tar = "https://download.gnome.org/sources/pango/1.56/pango-1.56.4.tar.xz"
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blake3 = "8042a82f08101c1dabcb337a96035167e3a300de395c57678ce1a133b2dba346"
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patches = ["redox.patch"]
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# Vendored local fork (full-fork model): builds from the committed source/
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# tree (offline, reproducible). source/ = pristine upstream + the patches below
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# BAKED IN. .patch files kept tracked so a version bump can re-apply them via
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# sync-recipe-source.sh.
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# upstream: https://download.gnome.org/sources/pango/1.56/pango-1.56.4.tar.xz
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# blake3: 8042a82f08101c1dabcb337a96035167e3a300de395c57678ce1a133b2dba346
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# patch (baked): redox.patch
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path = "source"
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[build]
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dependencies = [
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Binary file not shown.
@@ -0,0 +1 @@
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/subprojects/*/
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@@ -0,0 +1,199 @@
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include:
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- component: gitlab.gnome.org/GNOME/citemplates/release-service@master
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||||
inputs:
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dist-job-name: "linux-fedora"
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tarball-artifact-path: "_build/meson-dist/$CI_PROJECT_NAME-$CI_COMMIT_TAG.tar.xz"
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stages:
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- build
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- analysis
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- docs
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- deploy
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- release
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# Common variables
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variables:
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COMMON_MESON_FLAGS: ""
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MESON_TEST_TIMEOUT_MULTIPLIER: 2
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FEDORA_IMAGE: registry.gitlab.gnome.org/gnome/pango/fedora:v13
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.only-default:
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only:
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- branches
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except:
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- tags
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||||
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linux-fedora:
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image: $FEDORA_IMAGE
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stage: build
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needs: []
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||||
variables:
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||||
EXTRA_MESON_FLAGS: "--buildtype=debug --default-library=both"
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||||
script:
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||||
- git config --global --add safe.directory $CI_PROJECT_DIR
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||||
- meson setup ${COMMON_MESON_FLAGS} ${EXTRA_MESON_FLAGS} _build
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||||
- meson compile -C _build
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||||
- .gitlab-ci/run-tests.sh _build
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- meson dist -C _build --include-subprojects --no-tests
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||||
artifacts:
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||||
name: "${env:CI_JOB_NAME}-${env:CI_COMMIT_REF_NAME}"
|
||||
when: always
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||||
reports:
|
||||
junit:
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||||
- "${CI_PROJECT_DIR}/_build/meson-logs/testlog.junit.xml"
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paths:
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||||
- "${CI_PROJECT_DIR}/_build/meson-logs"
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||||
- "${CI_PROJECT_DIR}/_build/meson-dist/*.tar.xz"
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||||
- "${CI_PROJECT_DIR}/_build/hello.png"
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- "${CI_PROJECT_DIR}/_build/fontlist.txt"
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asan-build:
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extends: .only-default
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image: $FEDORA_IMAGE
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tags: [ asan ]
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stage: analysis
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needs: []
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script:
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- CC=clang meson setup --buildtype=debugoptimized -Db_sanitize=address -Db_lundef=false -Dintrospection=disabled _build
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- meson compile -C _build
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- .gitlab-ci/run-tests.sh _build
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artifacts:
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name: "${env:CI_JOB_NAME}-${env:CI_COMMIT_REF_NAME}"
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when: always
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reports:
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junit:
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- "${CI_PROJECT_DIR}/_build/meson-logs/testlog.junit.xml"
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paths:
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||||
- "${CI_PROJECT_DIR}/_build/meson-logs"
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- "${CI_PROJECT_DIR}/_build/hello.png"
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- "${CI_PROJECT_DIR}/_build/fontlist.txt"
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msys2-mingw64:
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extends: .only-default
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stage: build
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needs: []
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tags:
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- win32-ps
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variables:
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MSYSTEM: "MINGW64"
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CHERE_INVOKING: "yes"
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script:
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- C:\msys64\usr\bin\pacman --noconfirm -Syyuu
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- C:\msys64\usr\bin\bash -lc "bash -x ./.gitlab-ci/test-msys2.sh"
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- C:\msys64\usr\bin\bash -lc "bash -x ./.gitlab-ci/render-msys2.sh"
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- C:\msys64\usr\bin\bash -lc "bash -x ./.gitlab-ci/list-msys2.sh"
|
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artifacts:
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name: "${env:CI_JOB_NAME}-${env:CI_COMMIT_REF_NAME}"
|
||||
when: always
|
||||
reports:
|
||||
junit:
|
||||
- "${CI_PROJECT_DIR}/_build/meson-logs/testlog.junit.xml"
|
||||
paths:
|
||||
- "${CI_PROJECT_DIR}/_build/meson-logs"
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||||
- "${CI_PROJECT_DIR}/_build/hello.png"
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||||
- "${CI_PROJECT_DIR}/_build/fontlist.txt"
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||||
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vs2019-x64:
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# TODO: Uncomment this when ready to merge.
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# rules:
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# - if: $CI_PROJECT_NAMESPACE == "GNOME"
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stage: build
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tags:
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- win32-ps
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needs: []
|
||||
script:
|
||||
- .gitlab-ci/test-msvc.bat
|
||||
artifacts:
|
||||
name: "${env:CI_JOB_NAME}-${env:CI_COMMIT_REF_NAME}"
|
||||
when: always
|
||||
reports:
|
||||
junit:
|
||||
- "${CI_PROJECT_DIR}/_build/meson-logs/testlog.junit.xml"
|
||||
paths:
|
||||
- "${CI_PROJECT_DIR}/_build/meson-logs"
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||||
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||||
macos:
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extends: .only-default
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only:
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- branches@GNOME/pango
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- branches@dehesselle/pango
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stage: build
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tags:
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- macos
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- arm64
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needs: []
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variables:
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# ragel -Wno-unused-const-variable, -Wno-overloaded-virtual
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# pcre2 -Wno-overlength-strings
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# glib -Wno-deprecated-declarations, -Wno-literal-conversion
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# fribidi -Wno-deprecated-non-prototype, -Wno-enum-conversion
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# libpng -Wno-unused-but-set-variable
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# pixman -Wno-unknown-attributes
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# cairo -Wno-switch-enum, -Wno-deprecated-declarations, -Wno-unused-const-variable
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CFLAGS: "-Wno-overlength-strings -Wno-deprecated-non-prototype -Wno-enum-conversion -Wno-unused-but-set-variable -Wno-unknown-attributes -Wno-switch-enum -Wno-deprecated-declarations -Wno-unused-const-variable -Wno-literal-conversion"
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CXXFLAGS: "-Wno-overloaded-virtual -Wno-unused-const-variable"
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OBJCFLAGS: -Wno-deprecated-declarations
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||||
CCACHE_DIR: /Users/Shared/work/ccache
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CCACHE_VER: "4.9.1"
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||||
CCACHE_URL: https://github.com/ccache/ccache/releases/download/v$CCACHE_VER/ccache-$CCACHE_VER-darwin.tar.gz
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EXTRA_MESON_FLAGS: "-Dintrospection=disabled -Dpixman:tests=disabled -Dharfbuzz:ragel_subproject=true"
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PIP_CACHE_DIR: /Users/Shared/work/cache
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PIPENV_CACHE_DIR: $PIP_CACHE_DIR
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PYTHONPYCACHEPREFIX: $PIP_CACHE_DIR
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SDKROOT: /opt/sdks/MacOSX11.3.sdk
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before_script:
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- python3 -m venv .venv
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- curl -L $CCACHE_URL | tar -C .venv/bin -xz --strip-components=1 ccache-$CCACHE_VER-darwin/ccache
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- source .venv/bin/activate
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- pip3 install meson==1.4.2 ninja==1.11.1.1 packaging==23.2
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# Disable font-scale test as it SIGTRAPs. (The test code is skipped over by
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# inserting "return;" as first statement into the relevant function.)
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- |
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LINE_NO=$(grep -n "test_font_scale (void)" tests/test-font.c | awk -F ':' '{ print $1 }')
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sed -i '' ''$((LINE_NO+2))'i\
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return;' tests/test-font.c
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script:
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||||
- meson setup ${COMMON_MESON_FLAGS} ${EXTRA_MESON_FLAGS} _build
|
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- meson compile -C _build
|
||||
- .gitlab-ci/run-tests.sh _build
|
||||
artifacts:
|
||||
name: "${env:CI_JOB_NAME}-${env:CI_COMMIT_REF_NAME}"
|
||||
when: always
|
||||
reports:
|
||||
junit:
|
||||
- "${CI_PROJECT_DIR}/_build/meson-logs/testlog.junit.xml"
|
||||
paths:
|
||||
- "${CI_PROJECT_DIR}/_build/meson-logs"
|
||||
- "${CI_PROJECT_DIR}/_build/hello.png"
|
||||
- "${CI_PROJECT_DIR}/_build/fontlist.txt"
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||||
|
||||
reference:
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||||
image: $FEDORA_IMAGE
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stage: docs
|
||||
needs: []
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||||
variables:
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||||
EXTRA_MESON_FLAGS: ""
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script:
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||||
- meson ${COMMON_MESON_FLAGS} ${EXTRA_MESON_FLAGS} -Ddocumentation=true _build
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- ninja -C _build
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- mkdir -p _reference/
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- mv _build/docs/Pango/ _reference/
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- mv _build/docs/PangoCairo/ _reference/
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- mv _build/docs/PangoFc/ _reference/
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- mv _build/docs/PangoFT2/ _reference/
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- mv _build/docs/PangoOT/ _reference/
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- mv _build/docs/PangoXft/ _reference/
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||||
artifacts:
|
||||
paths:
|
||||
- _reference
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||||
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||||
pages:
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stage: deploy
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needs: ['reference']
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||||
script:
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- mv _reference/ public/
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artifacts:
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||||
paths:
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||||
- public
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||||
only:
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||||
- main
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||||
@@ -0,0 +1,38 @@
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## Pango CI infrastructure
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Pango uses different CI images depending on platform and jobs.
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||||
The CI images are Docker containers, generated either using `docker` or
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`podman`, and pushed to the GitLab [container registry][registry].
|
||||
|
||||
Each Docker image has a tag composed of two parts:
|
||||
|
||||
- `${image}`: the base image for a given platform, like "fedora" or
|
||||
"debian-stable"
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||||
- `${number}`: an incremental version number, or `latest`
|
||||
|
||||
See the [container registry][registry] for the available images for each
|
||||
branch, as well as their available versions.
|
||||
|
||||
### Checklist for Updating a CI image
|
||||
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||||
- [ ] Update the `${image}.Dockerfile` file with the dependencies
|
||||
- [ ] Run `./run-docker.sh build --base ${image} --base-version ${number}`
|
||||
- [ ] Run `./run-docker.sh push --base ${image} --base-version ${number}`
|
||||
once the Docker image is built; you may need to log in by using
|
||||
`docker login` or `podman login`
|
||||
- [ ] Update the `image` keys in the `.gitlab-ci.yml` file with the new
|
||||
image tag
|
||||
- [ ] Open a merge request with your changes and let it run
|
||||
|
||||
### Checklist for Adding a new CI image
|
||||
|
||||
- [ ] Write a new `${image}.Dockerfile` with the instructions to set up
|
||||
a build environment
|
||||
- [ ] Add the `pip3 install meson` incantation
|
||||
- [ ] Run `./run-docker.sh build --base ${image} --base-version ${number}`
|
||||
- [ ] Run `./run-docker.sh push --base ${image} --base-version ${number}`
|
||||
- [ ] Add the new job to `.gitlab-ci.yml` referencing the image
|
||||
- [ ] Open a merge request with your changes and let it run
|
||||
|
||||
[registry]: https://gitlab.gnome.org/GNOME/pango/container_registry
|
||||
@@ -0,0 +1,59 @@
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||||
FROM fedora:42
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||||
|
||||
RUN dnf -y install \
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||||
abattis-cantarell-fonts \
|
||||
cairo-devel \
|
||||
cairo-gobject-devel \
|
||||
ccache \
|
||||
clang \
|
||||
clang-analyzer \
|
||||
desktop-file-utils \
|
||||
diffutils \
|
||||
fontconfig-devel \
|
||||
fribidi-devel \
|
||||
gcc \
|
||||
gcc-c++ \
|
||||
gettext \
|
||||
git \
|
||||
glib2-devel \
|
||||
glib2-static \
|
||||
glibc-devel \
|
||||
glibc-headers \
|
||||
glibc-langpack-en \
|
||||
gobject-introspection-devel \
|
||||
google-droid-sans-fonts \
|
||||
gtk-doc \
|
||||
harfbuzz-devel \
|
||||
hicolor-icon-theme \
|
||||
itstool \
|
||||
json-glib-devel \
|
||||
libasan \
|
||||
lcov \
|
||||
libthai-devel \
|
||||
libubsan \
|
||||
libXft-devel \
|
||||
llvm \
|
||||
meson \
|
||||
ninja-build \
|
||||
python3 \
|
||||
python3-docutils \
|
||||
python3-jinja2 \
|
||||
python3-markdown \
|
||||
python3-packaging \
|
||||
python3-pip \
|
||||
python3-pygments \
|
||||
python3-toml \
|
||||
python3-typogrify \
|
||||
python3-wheel \
|
||||
redhat-rpm-config \
|
||||
thai-scalable-waree-fonts \
|
||||
&& dnf clean all
|
||||
|
||||
ARG HOST_USER_ID=5555
|
||||
ENV HOST_USER_ID ${HOST_USER_ID}
|
||||
RUN useradd -u $HOST_USER_ID -ms /bin/bash user
|
||||
|
||||
USER user
|
||||
WORKDIR /home/user
|
||||
|
||||
ENV LANG C.UTF-8
|
||||
@@ -0,0 +1,5 @@
|
||||
#!/bin/bash
|
||||
|
||||
set -e
|
||||
|
||||
PATH=_build/pango:$PATH _build/utils/pango-list --verbose --metrics > _build/fontlist.txt || true
|
||||
@@ -0,0 +1,5 @@
|
||||
#!/bin/bash
|
||||
|
||||
set -e
|
||||
|
||||
PATH=_build/pango:$PATH _build/utils/pango-view --no-display --output _build/hello.png utils/HELLO.txt || true
|
||||
+135
@@ -0,0 +1,135 @@
|
||||
#!/bin/bash
|
||||
|
||||
read_arg() {
|
||||
# $1 = arg name
|
||||
# $2 = arg value
|
||||
# $3 = arg parameter
|
||||
local rematch='^[^=]*=(.*)$'
|
||||
if [[ $2 =~ $rematch ]]; then
|
||||
read "$1" <<< "${BASH_REMATCH[1]}"
|
||||
else
|
||||
read "$1" <<< "$3"
|
||||
# There is no way to shift our callers args, so
|
||||
# return 1 to indicate they should do it instead.
|
||||
return 1
|
||||
fi
|
||||
}
|
||||
|
||||
set -e
|
||||
|
||||
build=0
|
||||
run=0
|
||||
push=0
|
||||
list=0
|
||||
print_help=0
|
||||
no_login=0
|
||||
|
||||
while (($# > 0)); do
|
||||
case "${1%%=*}" in
|
||||
build) build=1;;
|
||||
run) run=1;;
|
||||
push) push=1;;
|
||||
list) list=1;;
|
||||
help) print_help=1;;
|
||||
--base|-b) read_arg base "$@" || shift;;
|
||||
--base-version) read_arg base_version "$@" || shift;;
|
||||
--no-login) no_login=1;;
|
||||
*) echo -e "\e[1;31mERROR\e[0m: Unknown option '$1'"; exit 1;;
|
||||
esac
|
||||
shift
|
||||
done
|
||||
|
||||
if [ $print_help == 1 ]; then
|
||||
echo "$0 - Build and run Docker images"
|
||||
echo ""
|
||||
echo "Usage: $0 <command> [options] [basename]"
|
||||
echo ""
|
||||
echo "Available commands"
|
||||
echo ""
|
||||
echo " build --base=<BASENAME> - Build Docker image <BASENAME>.Dockerfile"
|
||||
echo " run --base=<BASENAME> - Run Docker image <BASENAME>"
|
||||
echo " push --base=<BASENAME> - Push Docker image <BASENAME> to the registry"
|
||||
echo " list - List available images"
|
||||
echo " help - This help message"
|
||||
echo ""
|
||||
exit 0
|
||||
fi
|
||||
|
||||
cd "$(dirname "$0")"
|
||||
|
||||
if [ $list == 1 ]; then
|
||||
echo "Available Docker images:"
|
||||
for f in *.Dockerfile; do
|
||||
filename=$( basename -- "$f" )
|
||||
basename="${filename%.*}"
|
||||
|
||||
echo -e " \e[1;39m$basename\e[0m"
|
||||
done
|
||||
exit 0
|
||||
fi
|
||||
|
||||
# All commands after this require --base to be set
|
||||
if [ -z $base ]; then
|
||||
echo "Usage: $0 <command>"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ ! -f "$base.Dockerfile" ]; then
|
||||
echo -e "\e[1;31mERROR\e[0m: Dockerfile for '$base' not found"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ -z $base_version ]; then
|
||||
base_version="latest"
|
||||
else
|
||||
base_version="v$base_version"
|
||||
fi
|
||||
|
||||
if [ ! -x "$(command -v docker)" ] || [ docker --help |& grep -q podman ]; then
|
||||
# Docker is actually implemented by podman, and its OCI output
|
||||
# is incompatible with some of the dockerd instances on GitLab
|
||||
# CI runners.
|
||||
echo "Using: Podman"
|
||||
format="--format docker"
|
||||
CMD="podman"
|
||||
else
|
||||
echo "Using: Docker"
|
||||
format=""
|
||||
CMD="sudo socker"
|
||||
fi
|
||||
|
||||
REGISTRY="registry.gitlab.gnome.org"
|
||||
TAG="${REGISTRY}/gnome/pango/${base}:${base_version}"
|
||||
|
||||
if [ $build == 1 ]; then
|
||||
echo -e "\e[1;32mBUILDING\e[0m: ${base} as ${TAG}"
|
||||
${CMD} build \
|
||||
${format} \
|
||||
--build-arg HOST_USER_ID="$UID" \
|
||||
--tag "${TAG}" \
|
||||
--file "${base}.Dockerfile" .
|
||||
exit $?
|
||||
fi
|
||||
|
||||
if [ $push == 1 ]; then
|
||||
echo -e "\e[1;32mPUSHING\e[0m: ${base} as ${TAG}"
|
||||
|
||||
if [ $no_login == 0 ]; then
|
||||
${CMD} login ${REGISTRY}
|
||||
fi
|
||||
|
||||
${CMD} push ${TAG}
|
||||
exit $?
|
||||
fi
|
||||
|
||||
if [ $run == 1 ]; then
|
||||
echo -e "\e[1;32mRUNNING\e[0m: ${base} as ${TAG}"
|
||||
${CMD} run \
|
||||
--rm \
|
||||
--volume "$(pwd)/..:/home/user/app" \
|
||||
--workdir "/home/user/app" \
|
||||
--tty \
|
||||
--interactive "${TAG}" \
|
||||
bash
|
||||
exit $?
|
||||
fi
|
||||
+28
@@ -0,0 +1,28 @@
|
||||
#!/bin/bash
|
||||
|
||||
set +x
|
||||
set +e
|
||||
|
||||
srcdir=$( pwd )
|
||||
builddir=$1
|
||||
|
||||
# Ignore memory leaks lower in dependencies
|
||||
export LSAN_OPTIONS=suppressions=$srcdir/lsan.supp:print_suppressions=0:symbolize=1
|
||||
export ASAN_SYMBOLIZER_PATH=/usr/bin/llvm-symbolizer
|
||||
|
||||
meson test -C ${builddir} \
|
||||
--timeout-multiplier "${MESON_TEST_TIMEOUT_MULTIPLIER}" \
|
||||
--print-errorlogs \
|
||||
--suite=pango
|
||||
|
||||
# Store the exit code for the CI run, but always
|
||||
# generate the reports
|
||||
exit_code=$?
|
||||
|
||||
cd ${builddir}
|
||||
|
||||
./utils/pango-list --verbose > fontlist.txt
|
||||
./tests/test-font -p /pango/font/metrics --verbose
|
||||
./utils/pango-view --no-display --output hello.png ${srcdir}/utils/HELLO.txt
|
||||
|
||||
exit $exit_code
|
||||
@@ -0,0 +1,18 @@
|
||||
@echo on
|
||||
:: vcvarsall.bat sets various env vars like PATH, INCLUDE, LIB, LIBPATH for the
|
||||
:: specified build architecture
|
||||
call "C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Auxiliary\Build\vcvarsall.bat" x64
|
||||
@echo on
|
||||
|
||||
:: Tests use the diff utility
|
||||
set PATH=%PATH%;C:\Program Files\Git\usr\bin
|
||||
|
||||
pip3 install --upgrade --user meson~=1.2 || goto :error
|
||||
meson setup -Dbackend_max_links=1 -Ddebug=false _build || goto :error
|
||||
meson compile -C _build || goto :error
|
||||
meson test -C _build -t "%MESON_TEST_TIMEOUT_MULTIPLIER%" --print-errorlogs --suite pango || goto :error
|
||||
|
||||
exit /b 0
|
||||
|
||||
:error
|
||||
exit /b 1
|
||||
@@ -0,0 +1,27 @@
|
||||
#!/bin/bash
|
||||
|
||||
set -e
|
||||
|
||||
if [[ "$MSYSTEM" == "MINGW32" ]]; then
|
||||
export MSYS2_ARCH="i686"
|
||||
else
|
||||
export MSYS2_ARCH="x86_64"
|
||||
fi
|
||||
|
||||
pacman --noconfirm -Suy
|
||||
|
||||
pacman --noconfirm -S --needed \
|
||||
base-devel \
|
||||
mingw-w64-$MSYS2_ARCH-gobject-introspection \
|
||||
mingw-w64-$MSYS2_ARCH-harfbuzz \
|
||||
mingw-w64-$MSYS2_ARCH-fontconfig \
|
||||
mingw-w64-$MSYS2_ARCH-fribidi \
|
||||
mingw-w64-$MSYS2_ARCH-libthai \
|
||||
mingw-w64-$MSYS2_ARCH-cairo \
|
||||
mingw-w64-$MSYS2_ARCH-meson \
|
||||
mingw-w64-$MSYS2_ARCH-toolchain \
|
||||
mingw-w64-$MSYS2_ARCH-cantarell-fonts
|
||||
|
||||
meson setup --buildtype debug _build
|
||||
meson compile -C _build
|
||||
meson test -C _build -t "$MESON_TEST_TIMEOUT_MULTIPLIER" --print-errorlogs --suite pango
|
||||
@@ -0,0 +1 @@
|
||||
pango-1.56.4.tar.xz
|
||||
@@ -0,0 +1,127 @@
|
||||
Formatting
|
||||
==========
|
||||
|
||||
The Pango formatting style is basically the GNU style of formatting
|
||||
(see http://www.gnu.org/prep/standards.html), with a few additions.
|
||||
In brief overview:
|
||||
|
||||
- Two character indents are used; braces go on a separate line, and
|
||||
get a separate indentation level, so the total indent for an
|
||||
enclosed block is 4 characters.
|
||||
|
||||
|
||||
```c
|
||||
if (x < foo (y, z))
|
||||
haha = bar[4] + 5;
|
||||
else
|
||||
{
|
||||
while (z)
|
||||
{
|
||||
haha += foo (z, z);
|
||||
z--;
|
||||
}
|
||||
return abc (haha);
|
||||
}
|
||||
```
|
||||
|
||||
- Spaces should be present between function name and argument block,
|
||||
and after commas.
|
||||
|
||||
foo (z, z)
|
||||
|
||||
- In pointer types, the '*' is grouped with the variable name,
|
||||
not with the base type.
|
||||
|
||||
int *a;
|
||||
|
||||
Not:
|
||||
|
||||
int* a;
|
||||
|
||||
In cases where there is no variable name, for instance, return
|
||||
values, there should be a single space between the base type
|
||||
and the '*'.
|
||||
|
||||
- function and variable names are lower_case_with_underscores
|
||||
type names are StudlyCaps, macro names are UPPER_CASE_WITH_UNDERSCORES
|
||||
|
||||
|
||||
Documentation comments
|
||||
======================
|
||||
|
||||
All public API functions should have inline documentation headers
|
||||
in the gtk-doc / gnome-doc style. For instance:
|
||||
|
||||
```c
|
||||
/**
|
||||
* pango_layout_get_line:
|
||||
* @layout: a `PangoLayout`
|
||||
* @line: the index of a line, which must be between 0 and
|
||||
* `pango_layout_get_line_count(layout) - 1`, inclusive.
|
||||
*
|
||||
* Retrieves a particular line from a `PangoLayout` (or @layout.)
|
||||
*
|
||||
* Return value: the requested `PangoLayoutLine`, or %NULL
|
||||
* if the index is out of range. This layout line can
|
||||
* be ref'ed and retained, but will become invalid
|
||||
* if changes are made to the `PangoLayout`.
|
||||
*
|
||||
* Since: 1.6
|
||||
*/
|
||||
PangoLayoutLine *
|
||||
pango_layout_get_line (PangoLayout *layout,
|
||||
int line)
|
||||
[...]
|
||||
```
|
||||
|
||||
Choosing Function Names
|
||||
=======================
|
||||
|
||||
- Don't abbreviate in unexpected ways:
|
||||
|
||||
```c
|
||||
pango_layout_get_line_count ();
|
||||
```
|
||||
|
||||
Not:
|
||||
|
||||
```c
|
||||
pango_layout_ln_cnt ();
|
||||
```
|
||||
|
||||
- function that retrieve a value in a side-effect free fashion, should
|
||||
include "get" in the name.
|
||||
|
||||
```c
|
||||
int pango_layout_get_line_count (PangoLayout *layout);
|
||||
```
|
||||
|
||||
Not:
|
||||
|
||||
```c
|
||||
pango_layout_line_count ();
|
||||
```
|
||||
|
||||
|
||||
- functions that set a single parameter in a side-effect free fashion
|
||||
should include "set" in the name, for instance:
|
||||
|
||||
```c
|
||||
void pango_layout_set_width (PangoLayout *layout,
|
||||
int width);
|
||||
```
|
||||
|
||||
Other comments
|
||||
==============
|
||||
|
||||
- Avoid unsigned values for all but flags fields. This is because
|
||||
the way C handles unsigned values generates bugs like crazy:
|
||||
|
||||
If width is unsigned and 10, then:
|
||||
|
||||
```c
|
||||
int new_width = MAX (width - 15, 1);
|
||||
```
|
||||
|
||||
produces 4294967291, not 1.
|
||||
|
||||
@@ -0,0 +1,482 @@
|
||||
GNU LIBRARY GENERAL PUBLIC LICENSE
|
||||
Version 2, June 1991
|
||||
|
||||
Copyright (C) 1991 Free Software Foundation, Inc.
|
||||
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
|
||||
[This is the first released version of the library GPL. It is
|
||||
numbered 2 because it goes with version 2 of the ordinary GPL.]
|
||||
|
||||
Preamble
|
||||
|
||||
The licenses for most software are designed to take away your
|
||||
freedom to share and change it. By contrast, the GNU General Public
|
||||
Licenses are intended to guarantee your freedom to share and change
|
||||
free software--to make sure the software is free for all its users.
|
||||
|
||||
This license, the Library General Public License, applies to some
|
||||
specially designated Free Software Foundation software, and to any
|
||||
other libraries whose authors decide to use it. You can use it for
|
||||
your libraries, too.
|
||||
|
||||
When we speak of free software, we are referring to freedom, not
|
||||
price. Our General Public Licenses are designed to make sure that you
|
||||
have the freedom to distribute copies of free software (and charge for
|
||||
this service if you wish), that you receive source code or can get it
|
||||
if you want it, that you can change the software or use pieces of it
|
||||
in new free programs; and that you know you can do these things.
|
||||
|
||||
To protect your rights, we need to make restrictions that forbid
|
||||
anyone to deny you these rights or to ask you to surrender the rights.
|
||||
These restrictions translate to certain responsibilities for you if
|
||||
you distribute copies of the library, or if you modify it.
|
||||
|
||||
For example, if you distribute copies of the library, whether gratis
|
||||
or for a fee, you must give the recipients all the rights that we gave
|
||||
you. You must make sure that they, too, receive or can get the source
|
||||
code. If you link a program with the library, you must provide
|
||||
complete object files to the recipients so that they can relink them
|
||||
with the library, after making changes to the library and recompiling
|
||||
it. And you must show them these terms so they know their rights.
|
||||
|
||||
Our method of protecting your rights has two steps: (1) copyright
|
||||
the library, and (2) offer you this license which gives you legal
|
||||
permission to copy, distribute and/or modify the library.
|
||||
|
||||
Also, for each distributor's protection, we want to make certain
|
||||
that everyone understands that there is no warranty for this free
|
||||
library. If the library is modified by someone else and passed on, we
|
||||
want its recipients to know that what they have is not the original
|
||||
version, so that any problems introduced by others will not reflect on
|
||||
the original authors' reputations.
|
||||
|
||||
Finally, any free program is threatened constantly by software
|
||||
patents. We wish to avoid the danger that companies distributing free
|
||||
software will individually obtain patent licenses, thus in effect
|
||||
transforming the program into proprietary software. To prevent this,
|
||||
we have made it clear that any patent must be licensed for everyone's
|
||||
free use or not licensed at all.
|
||||
|
||||
Most GNU software, including some libraries, is covered by the ordinary
|
||||
GNU General Public License, which was designed for utility programs. This
|
||||
license, the GNU Library General Public License, applies to certain
|
||||
designated libraries. This license is quite different from the ordinary
|
||||
one; be sure to read it in full, and don't assume that anything in it is
|
||||
the same as in the ordinary license.
|
||||
|
||||
The reason we have a separate public license for some libraries is that
|
||||
they blur the distinction we usually make between modifying or adding to a
|
||||
program and simply using it. Linking a program with a library, without
|
||||
changing the library, is in some sense simply using the library, and is
|
||||
analogous to running a utility program or application program. However, in
|
||||
a textual and legal sense, the linked executable is a combined work, a
|
||||
derivative of the original library, and the ordinary General Public License
|
||||
treats it as such.
|
||||
|
||||
Because of this blurred distinction, using the ordinary General
|
||||
Public License for libraries did not effectively promote software
|
||||
sharing, because most developers did not use the libraries. We
|
||||
concluded that weaker conditions might promote sharing better.
|
||||
|
||||
However, unrestricted linking of non-free programs would deprive the
|
||||
users of those programs of all benefit from the free status of the
|
||||
libraries themselves. This Library General Public License is intended to
|
||||
permit developers of non-free programs to use free libraries, while
|
||||
preserving your freedom as a user of such programs to change the free
|
||||
libraries that are incorporated in them. (We have not seen how to achieve
|
||||
this as regards changes in header files, but we have achieved it as regards
|
||||
changes in the actual functions of the Library.) The hope is that this
|
||||
will lead to faster development of free libraries.
|
||||
|
||||
The precise terms and conditions for copying, distribution and
|
||||
modification follow. Pay close attention to the difference between a
|
||||
"work based on the library" and a "work that uses the library". The
|
||||
former contains code derived from the library, while the latter only
|
||||
works together with the library.
|
||||
|
||||
Note that it is possible for a library to be covered by the ordinary
|
||||
General Public License rather than by this special one.
|
||||
|
||||
GNU LIBRARY GENERAL PUBLIC LICENSE
|
||||
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
|
||||
|
||||
0. This License Agreement applies to any software library which
|
||||
contains a notice placed by the copyright holder or other authorized
|
||||
party saying it may be distributed under the terms of this Library
|
||||
General Public License (also called "this License"). Each licensee is
|
||||
addressed as "you".
|
||||
|
||||
A "library" means a collection of software functions and/or data
|
||||
prepared so as to be conveniently linked with application programs
|
||||
(which use some of those functions and data) to form executables.
|
||||
|
||||
The "Library", below, refers to any such software library or work
|
||||
which has been distributed under these terms. A "work based on the
|
||||
Library" means either the Library or any derivative work under
|
||||
copyright law: that is to say, a work containing the Library or a
|
||||
portion of it, either verbatim or with modifications and/or translated
|
||||
straightforwardly into another language. (Hereinafter, translation is
|
||||
included without limitation in the term "modification".)
|
||||
|
||||
"Source code" for a work means the preferred form of the work for
|
||||
making modifications to it. For a library, complete source code means
|
||||
all the source code for all modules it contains, plus any associated
|
||||
interface definition files, plus the scripts used to control compilation
|
||||
and installation of the library.
|
||||
|
||||
Activities other than copying, distribution and modification are not
|
||||
covered by this License; they are outside its scope. The act of
|
||||
running a program using the Library is not restricted, and output from
|
||||
such a program is covered only if its contents constitute a work based
|
||||
on the Library (independent of the use of the Library in a tool for
|
||||
writing it). Whether that is true depends on what the Library does
|
||||
and what the program that uses the Library does.
|
||||
|
||||
1. You may copy and distribute verbatim copies of the Library's
|
||||
complete source code as you receive it, in any medium, provided that
|
||||
you conspicuously and appropriately publish on each copy an
|
||||
appropriate copyright notice and disclaimer of warranty; keep intact
|
||||
all the notices that refer to this License and to the absence of any
|
||||
warranty; and distribute a copy of this License along with the
|
||||
Library.
|
||||
|
||||
You may charge a fee for the physical act of transferring a copy,
|
||||
and you may at your option offer warranty protection in exchange for a
|
||||
fee.
|
||||
|
||||
2. You may modify your copy or copies of the Library or any portion
|
||||
of it, thus forming a work based on the Library, and copy and
|
||||
distribute such modifications or work under the terms of Section 1
|
||||
above, provided that you also meet all of these conditions:
|
||||
|
||||
a) The modified work must itself be a software library.
|
||||
|
||||
b) You must cause the files modified to carry prominent notices
|
||||
stating that you changed the files and the date of any change.
|
||||
|
||||
c) You must cause the whole of the work to be licensed at no
|
||||
charge to all third parties under the terms of this License.
|
||||
|
||||
d) If a facility in the modified Library refers to a function or a
|
||||
table of data to be supplied by an application program that uses
|
||||
the facility, other than as an argument passed when the facility
|
||||
is invoked, then you must make a good faith effort to ensure that,
|
||||
in the event an application does not supply such function or
|
||||
table, the facility still operates, and performs whatever part of
|
||||
its purpose remains meaningful.
|
||||
|
||||
(For example, a function in a library to compute square roots has
|
||||
a purpose that is entirely well-defined independent of the
|
||||
application. Therefore, Subsection 2d requires that any
|
||||
application-supplied function or table used by this function must
|
||||
be optional: if the application does not supply it, the square
|
||||
root function must still compute square roots.)
|
||||
|
||||
These requirements apply to the modified work as a whole. If
|
||||
identifiable sections of that work are not derived from the Library,
|
||||
and can be reasonably considered independent and separate works in
|
||||
themselves, then this License, and its terms, do not apply to those
|
||||
sections when you distribute them as separate works. But when you
|
||||
distribute the same sections as part of a whole which is a work based
|
||||
on the Library, the distribution of the whole must be on the terms of
|
||||
this License, whose permissions for other licensees extend to the
|
||||
entire whole, and thus to each and every part regardless of who wrote
|
||||
it.
|
||||
|
||||
Thus, it is not the intent of this section to claim rights or contest
|
||||
your rights to work written entirely by you; rather, the intent is to
|
||||
exercise the right to control the distribution of derivative or
|
||||
collective works based on the Library.
|
||||
|
||||
In addition, mere aggregation of another work not based on the Library
|
||||
with the Library (or with a work based on the Library) on a volume of
|
||||
a storage or distribution medium does not bring the other work under
|
||||
the scope of this License.
|
||||
|
||||
3. You may opt to apply the terms of the ordinary GNU General Public
|
||||
License instead of this License to a given copy of the Library. To do
|
||||
this, you must alter all the notices that refer to this License, so
|
||||
that they refer to the ordinary GNU General Public License, version 2,
|
||||
instead of to this License. (If a newer version than version 2 of the
|
||||
ordinary GNU General Public License has appeared, then you can specify
|
||||
that version instead if you wish.) Do not make any other change in
|
||||
these notices.
|
||||
|
||||
Once this change is made in a given copy, it is irreversible for
|
||||
that copy, so the ordinary GNU General Public License applies to all
|
||||
subsequent copies and derivative works made from that copy.
|
||||
|
||||
This option is useful when you wish to copy part of the code of
|
||||
the Library into a program that is not a library.
|
||||
|
||||
4. You may copy and distribute the Library (or a portion or
|
||||
derivative of it, under Section 2) in object code or executable form
|
||||
under the terms of Sections 1 and 2 above provided that you accompany
|
||||
it with the complete corresponding machine-readable source code, which
|
||||
must be distributed under the terms of Sections 1 and 2 above on a
|
||||
medium customarily used for software interchange.
|
||||
|
||||
If distribution of object code is made by offering access to copy
|
||||
from a designated place, then offering equivalent access to copy the
|
||||
source code from the same place satisfies the requirement to
|
||||
distribute the source code, even though third parties are not
|
||||
compelled to copy the source along with the object code.
|
||||
|
||||
5. A program that contains no derivative of any portion of the
|
||||
Library, but is designed to work with the Library by being compiled or
|
||||
linked with it, is called a "work that uses the Library". Such a
|
||||
work, in isolation, is not a derivative work of the Library, and
|
||||
therefore falls outside the scope of this License.
|
||||
|
||||
However, linking a "work that uses the Library" with the Library
|
||||
creates an executable that is a derivative of the Library (because it
|
||||
contains portions of the Library), rather than a "work that uses the
|
||||
library". The executable is therefore covered by this License.
|
||||
Section 6 states terms for distribution of such executables.
|
||||
|
||||
When a "work that uses the Library" uses material from a header file
|
||||
that is part of the Library, the object code for the work may be a
|
||||
derivative work of the Library even though the source code is not.
|
||||
Whether this is true is especially significant if the work can be
|
||||
linked without the Library, or if the work is itself a library. The
|
||||
threshold for this to be true is not precisely defined by law.
|
||||
|
||||
If such an object file uses only numerical parameters, data
|
||||
structure layouts and accessors, and small macros and small inline
|
||||
functions (ten lines or less in length), then the use of the object
|
||||
file is unrestricted, regardless of whether it is legally a derivative
|
||||
work. (Executables containing this object code plus portions of the
|
||||
Library will still fall under Section 6.)
|
||||
|
||||
Otherwise, if the work is a derivative of the Library, you may
|
||||
distribute the object code for the work under the terms of Section 6.
|
||||
Any executables containing that work also fall under Section 6,
|
||||
whether or not they are linked directly with the Library itself.
|
||||
|
||||
6. As an exception to the Sections above, you may also compile or
|
||||
link a "work that uses the Library" with the Library to produce a
|
||||
work containing portions of the Library, and distribute that work
|
||||
under terms of your choice, provided that the terms permit
|
||||
modification of the work for the customer's own use and reverse
|
||||
engineering for debugging such modifications.
|
||||
|
||||
You must give prominent notice with each copy of the work that the
|
||||
Library is used in it and that the Library and its use are covered by
|
||||
this License. You must supply a copy of this License. If the work
|
||||
during execution displays copyright notices, you must include the
|
||||
copyright notice for the Library among them, as well as a reference
|
||||
directing the user to the copy of this License. Also, you must do one
|
||||
of these things:
|
||||
|
||||
a) Accompany the work with the complete corresponding
|
||||
machine-readable source code for the Library including whatever
|
||||
changes were used in the work (which must be distributed under
|
||||
Sections 1 and 2 above); and, if the work is an executable linked
|
||||
with the Library, with the complete machine-readable "work that
|
||||
uses the Library", as object code and/or source code, so that the
|
||||
user can modify the Library and then relink to produce a modified
|
||||
executable containing the modified Library. (It is understood
|
||||
that the user who changes the contents of definitions files in the
|
||||
Library will not necessarily be able to recompile the application
|
||||
to use the modified definitions.)
|
||||
|
||||
b) Accompany the work with a written offer, valid for at
|
||||
least three years, to give the same user the materials
|
||||
specified in Subsection 6a, above, for a charge no more
|
||||
than the cost of performing this distribution.
|
||||
|
||||
c) If distribution of the work is made by offering access to copy
|
||||
from a designated place, offer equivalent access to copy the above
|
||||
specified materials from the same place.
|
||||
|
||||
d) Verify that the user has already received a copy of these
|
||||
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|
||||
|
||||
For an executable, the required form of the "work that uses the
|
||||
Library" must include any data and utility programs needed for
|
||||
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|
||||
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|
||||
distributed (in either source or binary form) with the major
|
||||
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|
||||
which the executable runs, unless that component itself accompanies
|
||||
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|
||||
|
||||
It may happen that this requirement contradicts the license
|
||||
restrictions of other proprietary libraries that do not normally
|
||||
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|
||||
use both them and the Library together in an executable that you
|
||||
distribute.
|
||||
|
||||
7. You may place library facilities that are a work based on the
|
||||
Library side-by-side in a single library together with other library
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
all its terms and conditions for copying, distributing or modifying
|
||||
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|
||||
|
||||
10. Each time you redistribute the Library (or any work based on the
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
You are not responsible for enforcing compliance by third parties to
|
||||
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|
||||
|
||||
11. If, as a consequence of a court judgment or allegation of patent
|
||||
infringement or for any other reason (not limited to patent issues),
|
||||
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|
||||
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|
||||
excuse you from the conditions of this License. If you cannot
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
|
||||
If any portion of this section is held invalid or unenforceable under any
|
||||
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|
||||
and the section as a whole is intended to apply in other circumstances.
|
||||
|
||||
It is not the purpose of this section to induce you to infringe any
|
||||
patents or other property right claims or to contest validity of any
|
||||
such claims; this section has the sole purpose of protecting the
|
||||
integrity of the free software distribution system which is
|
||||
implemented by public license practices. Many people have made
|
||||
generous contributions to the wide range of software distributed
|
||||
through that system in reliance on consistent application of that
|
||||
system; it is up to the author/donor to decide if he or she is willing
|
||||
to distribute software through any other system and a licensee cannot
|
||||
impose that choice.
|
||||
|
||||
This section is intended to make thoroughly clear what is believed to
|
||||
be a consequence of the rest of this License.
|
||||
|
||||
12. If the distribution and/or use of the Library is restricted in
|
||||
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|
||||
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|
||||
an explicit geographical distribution limitation excluding those countries,
|
||||
so that distribution is permitted only in or among countries not thus
|
||||
excluded. In such case, this License incorporates the limitation as if
|
||||
written in the body of this License.
|
||||
|
||||
13. The Free Software Foundation may publish revised and/or new
|
||||
versions of the Library General Public License from time to time.
|
||||
Such new versions will be similar in spirit to the present version,
|
||||
but may differ in detail to address new problems or concerns.
|
||||
|
||||
Each version is given a distinguishing version number. If the Library
|
||||
specifies a version number of this License which applies to it and
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
14. If you wish to incorporate parts of the Library into other free
|
||||
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|
||||
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|
||||
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|
||||
Software Foundation; we sometimes make exceptions for this. Our
|
||||
decision will be guided by the two goals of preserving the free status
|
||||
of all derivatives of our free software and of promoting the sharing
|
||||
and reuse of software generally.
|
||||
|
||||
NO WARRANTY
|
||||
|
||||
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
|
||||
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|
||||
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
|
||||
OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
|
||||
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|
||||
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||||
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
|
||||
LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
|
||||
THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
||||
|
||||
16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
|
||||
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
|
||||
AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
|
||||
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||||
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|
||||
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||||
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|
||||
FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
|
||||
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
||||
DAMAGES.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
How to Apply These Terms to Your New Libraries
|
||||
|
||||
If you develop a new library, and you want it to be of the greatest
|
||||
possible use to the public, we recommend making it free software that
|
||||
everyone can redistribute and change. You can do so by permitting
|
||||
redistribution under these terms (or, alternatively, under the terms of the
|
||||
ordinary General Public License).
|
||||
|
||||
To apply these terms, attach the following notices to the library. It is
|
||||
safest to attach them to the start of each source file to most effectively
|
||||
convey the exclusion of warranty; and each file should have at least the
|
||||
"copyright" line and a pointer to where the full notice is found.
|
||||
|
||||
<one line to give the library's name and a brief idea of what it does.>
|
||||
Copyright (C) <year> <name of author>
|
||||
|
||||
This library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Library General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2 of the License, or (at your option) any later version.
|
||||
|
||||
This library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Library General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Library General Public
|
||||
License along with this library; if not, write to the
|
||||
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
Boston, MA 02111-1307 USA.
|
||||
|
||||
Also add information on how to contact you by electronic and paper mail.
|
||||
|
||||
You should also get your employer (if you work as a programmer) or your
|
||||
school, if any, to sign a "copyright disclaimer" for the library, if
|
||||
necessary. Here is a sample; alter the names:
|
||||
|
||||
Yoyodyne, Inc., hereby disclaims all copyright interest in the
|
||||
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
|
||||
|
||||
<signature of Ty Coon>, 1 April 1990
|
||||
Ty Coon, President of Vice
|
||||
|
||||
That's all there is to it!
|
||||
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,76 @@
|
||||
Pango
|
||||
=====
|
||||
|
||||
Pango is a library for layout and rendering of text, with an emphasis
|
||||
on internationalization. Pango can be used anywhere that text layout
|
||||
is needed; however, most of the work on Pango so far has been done using
|
||||
the GTK widget toolkit as a test platform. Pango forms the core of text
|
||||
and font handling for GTK.
|
||||
|
||||
Pango is designed to be modular; the core Pango layout can be used
|
||||
with different font backends. There are three basic backends, with
|
||||
multiple options for rendering with each.
|
||||
|
||||
- Client-side fonts using the FreeType and FontConfig libraries.
|
||||
Rendering can be with with Cairo or Xft libraries, or directly
|
||||
to an in-memory buffer with no additional libraries.
|
||||
- Native fonts on Microsoft Windows. Rendering can be done via Cairo
|
||||
or directly using the native Win32 API.
|
||||
- Native fonts on MacOS X with the CoreText framework, rendering via
|
||||
Cairo.
|
||||
|
||||
The integration of Pango with [Cairo](https://cairographics.org)
|
||||
provides a complete solution with high quality text handling and
|
||||
graphics rendering.
|
||||
|
||||
As well as the low level layout rendering routines, Pango includes
|
||||
PangoLayout, a high level driver for laying out entire blocks of text,
|
||||
and routines to assist in editing internationalized text.
|
||||
|
||||
For more information about Pango, see:
|
||||
|
||||
https://www.pango.org/
|
||||
|
||||
Dependencies
|
||||
------------
|
||||
Pango depends on the GLib library; more information about GLib can
|
||||
be found at https://www.gtk.org/.
|
||||
|
||||
To use the Free Software stack backend, Pango depends on the following
|
||||
libraries:
|
||||
|
||||
- [FontConfig](https://www.fontconfig.org) for font discovery,
|
||||
- [FreeType](https://www.freetype.org) for font access,
|
||||
- [HarfBuzz](http://www.harfbuzz.org) for complex text shaping
|
||||
- [fribidi](http://fribidi.org) for bidirectional text handling
|
||||
|
||||
Cairo support depends on the [Cairo](https://cairographics.org) library.
|
||||
The Cairo backend is the preferred backend to use Pango with and is
|
||||
subject of most of the development in the future. It has the
|
||||
advantage that the same code can be used for display and printing.
|
||||
|
||||
We suggest using Pango with Cairo as described above, but you can also
|
||||
do X-specific rendering using the Xft library. The Xft backend uses
|
||||
version 2 of the Xft library to manage client side fonts. Version 2 of
|
||||
Xft is available from https://xlibs.freedesktop.org/release/. You'll
|
||||
need the libXft package, and possibly the libXrender and renderext
|
||||
packages as well. You'll also need FontConfig.
|
||||
|
||||
Installation of Pango on Win32 is possible, see README.win32.
|
||||
|
||||
License
|
||||
-------
|
||||
Most of the code of Pango is licensed under the terms of the
|
||||
GNU Lesser Public License (LGPL) - see the file COPYING for details.
|
||||
|
||||
Versioning
|
||||
----------
|
||||
|
||||
Historically, Pango was following the traditionally even/odd library
|
||||
versioning scheme where stable releases are marked by even minor
|
||||
and development releases by an odd minor.
|
||||
|
||||
In recent years, Pango development has slowed down so much that it
|
||||
no longer makes sense to have unstable cycles, or even unstable releases.
|
||||
Going forward, pango versions will simply be increasing triples, with
|
||||
no particular significance to the parity of the minor version.
|
||||
@@ -0,0 +1,112 @@
|
||||
## Preface
|
||||
|
||||
The Pango backend written for Win32 is PangoWin32. PangoWin32 uses
|
||||
the Win32 GDI font API. GTK+ 2.8 and later on Win32 however actually
|
||||
uses the PangoCairo backend (which then uses only small parts of
|
||||
PangoWin32). Much of the GDI/DirectWrite font API calls are in Cairo.
|
||||
|
||||
The PangoFt2 backend was originally written with Win32 in mind, but
|
||||
its main use nowadays is on other platforms than Win32.
|
||||
|
||||
## ToolChain Requirement for Building Pango for Win32
|
||||
|
||||
You need to have gcc (mingw-w64) or Visual Studio 2015 or later (Visual
|
||||
Studio 2019 or later is recommended if introspection files are being built),
|
||||
along with Python 3.7.x+ and Meson 0.60.0 at the time of writing. If building
|
||||
the introspection files, you will also need to ensure that the Python
|
||||
release series and build architecture (i.e. Win32 (x86)/ x64 (amd64/x86-64)/ARM64
|
||||
(aarch64)) matches the Python release series and build architecture that was used
|
||||
to build GObject-Introspection is installed onthe system.
|
||||
|
||||
Cross-compiling Pango for ARM64/aarch64 with Visual Studio 2017 or later is
|
||||
also supported, provided if a cross compilation file for Meson is properly
|
||||
setup for such builds (please refer to the Meson documentation for further
|
||||
instructions). Support for introspection for cross-compiled ARM64 builds is
|
||||
currently not supported, as introspection builds are currently not supported
|
||||
for any cross-builds where the compiled code cannot run on the build system.
|
||||
|
||||
The Ninja build utility must also be in your PATH, unless using the
|
||||
Visual Studio IDE as noted [below](#building-pango).
|
||||
|
||||
## Dependencies
|
||||
|
||||
You will also need the following libraries installed with their headers
|
||||
and import libraries, and their DLLs, if applicable, needs to be found in
|
||||
%PATH%. All of their required dependencies are required as well. Their
|
||||
pkg-config files are needed on all builds unless otherwise noted, where
|
||||
only their headers/import libraries are needed on Visual Studio (please also read
|
||||
[this section](#additional-notes-on-building-pangoft2) for more info for enabling
|
||||
PangoFt2):
|
||||
|
||||
* GLib
|
||||
* Fribidi
|
||||
* Cairo (also via headers and libs; with Win32 support built in, and FreeType and
|
||||
FontConfig support built in if building PangoFT2; Cairo 1.18.0 or later is highly
|
||||
recommended)
|
||||
* HarfBuzz (GLib support required, and FreeType2 support if building PangoFT2;
|
||||
for Visual Studio builds, this needs to be built with Visual Studio 2017 15.9.x or
|
||||
later--if building introspection files, Visual Studio 2019 or later is highly
|
||||
recommended)
|
||||
* FreeType (needed if building PangoFT2)
|
||||
* FontConfig (needed if building PangoFT2)
|
||||
|
||||
Please see `meson.build` to see what versions are needed for these dependencies.
|
||||
|
||||
## Building Pango
|
||||
|
||||
1. Invoke the Meson configuration as follows, in a directory separate from the
|
||||
sources:
|
||||
|
||||
1.1. MinGW (please adjust the paths accordingly, in a MSYS/MSYS2 bash prompt):
|
||||
```
|
||||
PATH=/devel/dist/glib-2.8.0/bin:$PATH ACLOCAL_FLAGS="-I /devel/dist/glib-2.8.0/share/aclocal" CC='gcc -mtune=pentium3' CPPFLAGS='-I/opt/gnu/include' LDFLAGS='-L/opt/gnu/lib' CFLAGS=-O meson setup $(pango_root_srcdir) --buildtype=$(buildtype) --prefix=$(PREFIX) [--pkg-config-path=...]
|
||||
```
|
||||
|
||||
1.2 Visual Studio (set the `%INCLUDE%`, `%LIB%`, `%PATH%` envvars as needed
|
||||
before running the following in a Visual Studio command prompt)
|
||||
|
||||
```
|
||||
meson $(pango_root_srcdir) --buildtype=$(buildtype) --prefix=$(PREFIX) [--pkg-config-path=...]
|
||||
```
|
||||
|
||||
For Visual Studio builds, support for building using Visual Studio Project
|
||||
Files is also supported to some extent. Append `--backend=vs` to the Meson
|
||||
configuration command above to use this support. Note that this support
|
||||
may not work as well as the builds that are carried out by `ninja`, and
|
||||
issues in regards to building with Meson using Visual Studio Project files
|
||||
(i.e. `msbuild`) should be reported to the Meson project.
|
||||
|
||||
2. Build Pango by running Ninja (or with the generated Visual Studio project
|
||||
files).
|
||||
|
||||
3. Run tests and/or install the build using the `test` and `install` targets. To
|
||||
run the tests, you may need to have GNU `diff` in your `%PATH%`, that can be
|
||||
obtained via installing MSYS2 for Visual Studio users (the path where GNU `diff`
|
||||
is located should be towards the end of your `%PATH%`).
|
||||
|
||||
## Additional notes on building PangoFt2
|
||||
Please take note of the following items when attempting to build with PangoFt2 on
|
||||
Windows, in addition to the things mentioned [here](#dependencies), when invoking
|
||||
Meson to configure the build (builds of Cairo, HarfBuzz and FreeType as subprojects
|
||||
will be built consistent with the descriptions below):
|
||||
* Pango: You need to pass in `-Dfontconfig=enabled -Dfreetype=enabled` when
|
||||
building Pango itself, as FontConfig/FreeType support needs to be explicitly
|
||||
enabled for Windows builds, that is used to build PangoFt2.
|
||||
* Cairo: Cairo needs to be built with FreeType *and* FontConfig support, which
|
||||
must be explicitly enabled as they are disabled by default, in particular when
|
||||
building Cairo 1.17.x or later, which is also done by Meson. Pass in
|
||||
`-Dfontconfig=enabled -Dfreetype=enabled` when building Cairo.
|
||||
* HarfBuzz: HarfBuzz needs to be built with FreeType support enabled, so ensure
|
||||
that is true by using `-Dfreetype=enabled`.
|
||||
* FreeType: If Pango is being built without FreeType *and* HarfBuzz
|
||||
found, FreeType will be built without HarfBuzz support. In this case, if building
|
||||
FreeType with HarfBuzz is desired, first build and install PangoFt2 along with
|
||||
FreeType and HarfBuzz, and then do a separate standalone build of FreeType against
|
||||
that PangoFt2 build, and you will have your FreeType build with HarfBuzz enabled.
|
||||
This is consistent with the official instructions for building FreeType that has
|
||||
HarfBuzz enabled, from scratch.
|
||||
|
||||
See the following GNOME Live! page for a more detailed description of building
|
||||
Pango's dependencies with Visual Studio:
|
||||
|
||||
https://wiki.gnome.org/Projects/GTK/Win32/MSVCCompilationOfGTKStack
|
||||
@@ -0,0 +1,13 @@
|
||||
Abigail Brady (Indic shapers)
|
||||
Hans Breuer (Windows backend)
|
||||
Matthias Clasen (Documentation)
|
||||
Sivaraj Doddannan (Tamil shaper)
|
||||
Behdad Esfahbod
|
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Dov Grobgeld (Hebrew shaper)
|
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Karl Koehler (Arabic shaper)
|
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Alex Larsson (FreeType and Windows backends)
|
||||
Tor Lillqvist (FreeType and Windows backends)
|
||||
Changwoo Ryu (Hangul shaper)
|
||||
Havoc Pennington
|
||||
Roozbeh Pournader (Arabic shaper)
|
||||
Chookij Vanatham (Hebrew shaper)
|
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@@ -0,0 +1,23 @@
|
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#!/usr/bin/env python3
|
||||
|
||||
import os
|
||||
import shutil
|
||||
|
||||
references = [
|
||||
'docs/Pango',
|
||||
'docs/PangoCairo',
|
||||
'docs/PangoFc',
|
||||
'docs/PangoFT2',
|
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'docs/PangoOT',
|
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'docs/PangoXft',
|
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]
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sourceroot = os.environ.get('MESON_SOURCE_ROOT')
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buildroot = os.environ.get('MESON_BUILD_ROOT')
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distroot = os.environ.get('MESON_DIST_ROOT')
|
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|
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for reference in references:
|
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src_path = os.path.join(buildroot, reference)
|
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if os.path.isdir(src_path):
|
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shutil.copytree(src_path, dst_path)
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6300 2475 m
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Center
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gidocgen = find_program('gi-docgen', required: get_option('documentation'), native: true)
|
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|
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gidocgen_common_args = [
|
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'--quiet',
|
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'--no-namespace-dir',
|
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]
|
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|
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if get_option('werror')
|
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gidocgen_common_args += ['--fatal-warnings']
|
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endif
|
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|
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docs_dir = pango_datadir / 'doc'
|
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|
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if get_option('documentation') and not build_gir
|
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error('API reference requires introspection.')
|
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endif
|
||||
|
||||
pango_content_files = [
|
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'pango_rendering.md',
|
||||
'pango_markup.md',
|
||||
'pango_fonts.md',
|
||||
'pango_bidi.md',
|
||||
'pango-name.png',
|
||||
'layout-light.png',
|
||||
'layout-dark.png',
|
||||
'pipeline-light.png',
|
||||
'pipeline-dark.png',
|
||||
'rects1.png',
|
||||
'rects2.png',
|
||||
'rects3.png',
|
||||
'arabic-markup.png',
|
||||
'blue-text.png',
|
||||
'align-left.png',
|
||||
'align-center.png',
|
||||
'align-right.png',
|
||||
'align-left-justify.png',
|
||||
'align-center-justify.png',
|
||||
'align-right-justify.png',
|
||||
'vertical-light.png',
|
||||
'vertical-dark.png',
|
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'm-south.png',
|
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'm-west.png',
|
||||
'm-north.png',
|
||||
'm-east.png',
|
||||
'bidi-input-light.png',
|
||||
'bidi-input-dark.png',
|
||||
'bidi-annotate-light.png',
|
||||
'bidi-annotate-dark.png',
|
||||
'split-cursor.png',
|
||||
'split-cursor-light.png',
|
||||
'split-cursor-dark.png',
|
||||
'fontmetrics-light.png',
|
||||
'fontmetrics-dark.png',
|
||||
'caret-metrics-light.png',
|
||||
'caret-metrics-dark.png',
|
||||
'cursor-positions-light.png',
|
||||
'cursor-positions-dark.png',
|
||||
'glyphstring-positions-light.png',
|
||||
'glyphstring-positions-dark.png',
|
||||
'baseline-shift-light.png',
|
||||
'baseline-shift-dark.png',
|
||||
]
|
||||
|
||||
doc_conf = configuration_data()
|
||||
doc_conf.set('PANGO_VERSION', meson.project_version())
|
||||
|
||||
if get_option('documentation')
|
||||
pango_toml = configure_file(input: 'pango.toml.in',
|
||||
output: 'pango.toml',
|
||||
configuration: doc_conf)
|
||||
|
||||
custom_target('pango-doc',
|
||||
input: pango_gir[0],
|
||||
output: 'Pango',
|
||||
command: [
|
||||
gidocgen,
|
||||
'generate',
|
||||
gidocgen_common_args,
|
||||
'--add-include-path=@0@'.format(meson.current_build_dir() / '../pango'),
|
||||
'--config', pango_toml,
|
||||
'--output-dir=@OUTPUT@',
|
||||
'--content-dir=@0@'.format(meson.current_source_dir()),
|
||||
'@INPUT@',
|
||||
],
|
||||
depend_files: [ pango_toml, pango_content_files],
|
||||
build_by_default: true,
|
||||
install: true,
|
||||
install_dir: docs_dir,
|
||||
)
|
||||
|
||||
if build_pangoft2
|
||||
pangoft2_toml = configure_file(input: 'pangoft2.toml.in',
|
||||
output: 'pangoft2.toml',
|
||||
configuration: doc_conf)
|
||||
|
||||
custom_target('pangoft-doc',
|
||||
input: pangoft2_gir[0],
|
||||
output: 'PangoFT2',
|
||||
command: [
|
||||
gidocgen,
|
||||
'generate',
|
||||
gidocgen_common_args,
|
||||
'--add-include-path=@0@'.format(meson.current_build_dir() / '../pango'),
|
||||
'--config', pangoft2_toml,
|
||||
'--output-dir=@OUTPUT@',
|
||||
'--content-dir=@0@'.format(meson.current_source_dir()),
|
||||
'@INPUT@',
|
||||
],
|
||||
depend_files: [ pangoft2_toml, 'pango-name.png' ],
|
||||
build_by_default: true,
|
||||
install: true,
|
||||
install_dir: docs_dir,
|
||||
)
|
||||
endif
|
||||
|
||||
if xft_dep.found() and fontconfig_dep.found()
|
||||
pangoxft_toml = configure_file(input: 'pangoxft.toml.in',
|
||||
output: 'pangoxft.toml',
|
||||
configuration: doc_conf)
|
||||
|
||||
custom_target('pangoxft-doc',
|
||||
input: pangoxft_gir[0],
|
||||
output: 'PangoXft',
|
||||
command: [
|
||||
gidocgen,
|
||||
'generate',
|
||||
gidocgen_common_args,
|
||||
'--add-include-path=@0@'.format(meson.current_build_dir() / '../pango'),
|
||||
'--config', pangoxft_toml,
|
||||
'--output-dir=@OUTPUT@',
|
||||
'--content-dir=@0@'.format(meson.current_source_dir()),
|
||||
'@INPUT@',
|
||||
],
|
||||
depend_files: [ pangoxft_toml, 'pango-name.png' ],
|
||||
build_by_default: true,
|
||||
install: true,
|
||||
install_dir: docs_dir,
|
||||
)
|
||||
endif
|
||||
|
||||
if cairo_dep.found()
|
||||
pangocairo_content_files = [
|
||||
'pango_cairo.md',
|
||||
'pango-name.png',
|
||||
'rotated-text.png',
|
||||
]
|
||||
|
||||
pangocairo_toml = configure_file(input: 'pangocairo.toml.in',
|
||||
output: 'pangocairo.toml',
|
||||
configuration: doc_conf)
|
||||
|
||||
custom_target('pangocairo-doc',
|
||||
input: pangocairo_gir[0],
|
||||
output: 'PangoCairo',
|
||||
command: [
|
||||
gidocgen,
|
||||
'generate',
|
||||
gidocgen_common_args,
|
||||
'--add-include-path=@0@'.format(meson.current_build_dir() / '../pango'),
|
||||
'--config', pangocairo_toml,
|
||||
'--output-dir=@OUTPUT@',
|
||||
'--content-dir=@0@'.format(meson.current_source_dir()),
|
||||
'@INPUT@',
|
||||
],
|
||||
depend_files: [ pangocairo_toml, pangocairo_content_files ],
|
||||
build_by_default: true,
|
||||
install: true,
|
||||
install_dir: docs_dir,
|
||||
)
|
||||
endif
|
||||
|
||||
if fontconfig_dep.found()
|
||||
pangoot_toml = configure_file(input: 'pangoot.toml.in',
|
||||
output: 'pangoot.toml',
|
||||
configuration: doc_conf)
|
||||
|
||||
custom_target('pangoot-doc',
|
||||
input: pangoot_gir[0],
|
||||
output: 'PangoOT',
|
||||
command: [
|
||||
gidocgen,
|
||||
'generate',
|
||||
gidocgen_common_args,
|
||||
'--add-include-path=@0@'.format(meson.current_build_dir() / '../pango'),
|
||||
'--config', pangoot_toml,
|
||||
'--output-dir=@OUTPUT@',
|
||||
'--content-dir=@0@'.format(meson.current_source_dir()),
|
||||
'@INPUT@',
|
||||
],
|
||||
depend_files: [ pangoot_toml, 'pango-name.png' ],
|
||||
build_by_default: true,
|
||||
install: true,
|
||||
install_dir: docs_dir,
|
||||
)
|
||||
|
||||
pangofc_toml = configure_file(input: 'pangofc.toml.in',
|
||||
output: 'pangofc.toml',
|
||||
configuration: doc_conf)
|
||||
|
||||
custom_target('pangofc-doc',
|
||||
input: pangofc_gir[0],
|
||||
output: 'PangoFc',
|
||||
command: [
|
||||
gidocgen,
|
||||
'generate',
|
||||
gidocgen_common_args,
|
||||
'--add-include-path=@0@'.format(meson.current_build_dir() / '../pango'),
|
||||
'--config', pangofc_toml,
|
||||
'--output-dir=@OUTPUT@',
|
||||
'--content-dir=@0@'.format(meson.current_source_dir()),
|
||||
'@INPUT@',
|
||||
],
|
||||
depend_files: [ pangofc_toml, 'pango-name.png' ],
|
||||
build_by_default: true,
|
||||
install: true,
|
||||
install_dir: docs_dir,
|
||||
)
|
||||
endif
|
||||
endif
|
||||
|
||||
rst2man = find_program('rst2man', 'rst2man.py', required: get_option('man-pages'))
|
||||
rst2html5 = find_program('rst2html5', 'rst2html5.py', required: get_option('documentation'))
|
||||
|
||||
rst_files = [
|
||||
[ 'pango-view', '1' ],
|
||||
[ 'pango-list', '1' ],
|
||||
[ 'pango-segmentation', '1' ],
|
||||
]
|
||||
|
||||
rst2x_flags = [
|
||||
'--syntax-highlight=none',
|
||||
]
|
||||
|
||||
if get_option('man-pages')
|
||||
|
||||
foreach rst: rst_files
|
||||
man_name = rst[0]
|
||||
man_section = rst.get(1, '1')
|
||||
|
||||
custom_target('man-@0@'.format(man_name),
|
||||
input: '@0@.rst'.format(man_name),
|
||||
output: '@0@.@1@'.format(man_name, man_section),
|
||||
command: [
|
||||
rst2man,
|
||||
rst2x_flags,
|
||||
'@INPUT@',
|
||||
],
|
||||
capture: true,
|
||||
install: true,
|
||||
install_dir: get_option('mandir') / 'man@0@'.format(man_section),
|
||||
install_tag: 'doc',
|
||||
)
|
||||
endforeach
|
||||
endif
|
||||
|
||||
if get_option('documentation')
|
||||
|
||||
foreach rst: rst_files
|
||||
man_name = rst[0]
|
||||
|
||||
custom_target(
|
||||
input: '@0@.rst'.format(man_name),
|
||||
output: '@0@.html'.format(man_name),
|
||||
command: [
|
||||
rst2html5,
|
||||
rst2x_flags,
|
||||
'@INPUT@',
|
||||
],
|
||||
capture: true,
|
||||
install: true,
|
||||
install_dir: docs_dir / 'Pango',
|
||||
install_tag: 'doc',
|
||||
)
|
||||
endforeach
|
||||
endif
|
||||
@@ -0,0 +1,49 @@
|
||||
.. _pango-list(1):
|
||||
|
||||
==========
|
||||
pango-list
|
||||
==========
|
||||
|
||||
----------------------
|
||||
Pango font enumeration
|
||||
----------------------
|
||||
|
||||
:Version: Pango
|
||||
:Manual section: 1
|
||||
:Manual group: Pango commands
|
||||
|
||||
SYNOPSIS
|
||||
--------
|
||||
|
||||
| **pango-list** [OPTIONS...]
|
||||
|
||||
DESCRIPTION
|
||||
-----------
|
||||
|
||||
``pango-list`` enumerates fonts using Pangos font map apis.
|
||||
|
||||
HELP OPTIONS
|
||||
------------
|
||||
|
||||
``-h, --help``
|
||||
|
||||
Show help options.
|
||||
|
||||
``--version``
|
||||
|
||||
Print the command's version and exit.
|
||||
|
||||
APPLICATION OPTIONS
|
||||
-------------------
|
||||
|
||||
``--verbose``
|
||||
|
||||
Print verbose information.
|
||||
|
||||
``--metrics``
|
||||
|
||||
Print font metrics.
|
||||
|
||||
``--variations``
|
||||
|
||||
Print font variations.
|
||||
Binary file not shown.
|
After Width: | Height: | Size: 13 KiB |
Binary file not shown.
|
After Width: | Height: | Size: 2.0 KiB |
Binary file not shown.
|
After Width: | Height: | Size: 13 KiB |
Binary file not shown.
|
After Width: | Height: | Size: 13 KiB |
@@ -0,0 +1,50 @@
|
||||
.. _pango-segmentation(1):
|
||||
|
||||
==================
|
||||
pango-segmentation
|
||||
==================
|
||||
|
||||
-----------------------
|
||||
Pango text segmentation
|
||||
-----------------------
|
||||
|
||||
:Version: Pango
|
||||
:Manual section: 1
|
||||
:Manual group: Pango commands
|
||||
|
||||
SYNOPSIS
|
||||
--------
|
||||
|
||||
| **pango-segmentation** [OPTIONS...] [FILE]
|
||||
|
||||
DESCRIPTION
|
||||
-----------
|
||||
|
||||
``pango-segmentation`` shows text boundaries determined by Pango.
|
||||
|
||||
These can be graphemes (cursor positions), words boundaries, word
|
||||
starts and ends, line break possibilities, sentence boundaries, or
|
||||
sentence starts and ends.
|
||||
|
||||
HELP OPTIONS
|
||||
------------
|
||||
|
||||
``-h, --help``
|
||||
|
||||
Show help options.
|
||||
|
||||
``--version``
|
||||
|
||||
Print the command's version and exit.
|
||||
|
||||
APPLICATION OPTIONS
|
||||
-------------------
|
||||
|
||||
``--text=STRING``
|
||||
|
||||
Text to display (instead of ``FILE``).
|
||||
|
||||
``--kind=KIND``
|
||||
|
||||
The boundary to show. ``KIND`` can be one of grapheme, word, words, line, sentence,
|
||||
sentences. (default: grapheme).
|
||||
@@ -0,0 +1,211 @@
|
||||
.. _pango-view(1):
|
||||
|
||||
==========
|
||||
pango-view
|
||||
==========
|
||||
|
||||
-----------------
|
||||
Pango text viewer
|
||||
-----------------
|
||||
|
||||
:Version: Pango
|
||||
:Manual section: 1
|
||||
:Manual group: Pango commands
|
||||
|
||||
SYNOPSIS
|
||||
--------
|
||||
|
||||
| **pango-view** [OPTIONS...] FILE
|
||||
|
||||
DESCRIPTION
|
||||
-----------
|
||||
|
||||
``pango-view`` formats a text using Pango, with options to exercise
|
||||
most of Pango's layout features.
|
||||
|
||||
HELP OPTIONS
|
||||
------------
|
||||
|
||||
``-h, --help``
|
||||
|
||||
Show help options.
|
||||
|
||||
``--help-all``
|
||||
|
||||
Show all help options.
|
||||
|
||||
``--help-cairo``
|
||||
|
||||
Show help for options understood by the cairo backend.
|
||||
|
||||
``--version``
|
||||
|
||||
Print the command's version and exit.
|
||||
|
||||
CAIRO BACKEND OPTIONS
|
||||
---------------------
|
||||
|
||||
``--annotate=FLAGS``
|
||||
|
||||
Annotate the output. Comma-separated list of gravity, progression, baselines,
|
||||
layout, line, run, cluster, char, glyph, caret, slope
|
||||
|
||||
APPLICATION OPTIONS
|
||||
-------------------
|
||||
|
||||
``--no-auto-dir``
|
||||
|
||||
No layout direction according to contents.
|
||||
|
||||
``--backend=cairo/xft/ft2``
|
||||
|
||||
Pango backend to use for rendering (default: cairo).
|
||||
|
||||
``--background=red/#rrggbb/#rrggbbaa/transparent``
|
||||
|
||||
Set the background color.
|
||||
|
||||
``-q, --no-display``
|
||||
|
||||
Do not display (just write to file or whatever).
|
||||
|
||||
``--dpi=number``
|
||||
|
||||
Set the resolution.
|
||||
|
||||
``--align=left/center/right``
|
||||
|
||||
Set text alignment.
|
||||
|
||||
``--ellipsize=start/middle/end``
|
||||
|
||||
Set ellipsization mode.
|
||||
|
||||
``--font=description``
|
||||
|
||||
Set the font description.
|
||||
|
||||
``--foreground=red/#rrggbb/#rrggbbaa``
|
||||
|
||||
Set the text color.
|
||||
|
||||
``--gravity=south/east/north/west/auto``
|
||||
|
||||
Set base gravity: glyph rotation.
|
||||
|
||||
``--gravity-hint=natural/strong/line``
|
||||
|
||||
Set gravity hint.
|
||||
|
||||
``--header``
|
||||
|
||||
Display the options in the output.
|
||||
|
||||
``--height=+points/-numlines``
|
||||
|
||||
Set height in points (positive) or number of lines (negative) for ellipsizing.
|
||||
|
||||
``--hinting=none/auto/slight/medium/full``
|
||||
|
||||
Set hinting style.
|
||||
|
||||
``--antialias=none/gray/subpixel``
|
||||
|
||||
Set antialiasing.
|
||||
|
||||
``--hint-metrics=on/off``
|
||||
|
||||
Set hint metrics.
|
||||
|
||||
``--subpixel-positions``
|
||||
|
||||
Set subpixel positioning.
|
||||
|
||||
``--subpixel-order=rgb/bgr/vrgb/vbgr``
|
||||
|
||||
Set subpixel order.
|
||||
|
||||
``--indent=points``
|
||||
|
||||
Set paragraph indentation (in points).
|
||||
|
||||
``--spacing=points``
|
||||
|
||||
Set line spacing (in points).
|
||||
|
||||
``--line-spacing=factor``
|
||||
|
||||
Set spread factor for line height.
|
||||
|
||||
``--justify``
|
||||
|
||||
Stretch paragraph lines to be justified.
|
||||
|
||||
``--justify-last-line``
|
||||
|
||||
Justify the last line of the paragraph.
|
||||
|
||||
``--language=en_US/etc``
|
||||
|
||||
Set language to use for font selection.
|
||||
|
||||
``--margin=CSS-style numbers in pixels``
|
||||
|
||||
Set the margin on the output in pixels.
|
||||
|
||||
``--markup``
|
||||
|
||||
Interpret text as Pango markup.
|
||||
|
||||
``-o, --output=file``
|
||||
|
||||
Save rendered image to output file.
|
||||
|
||||
``--pixels``
|
||||
|
||||
Use pixel units instead of points (sets dpi to 72).
|
||||
|
||||
``--pango-units``
|
||||
|
||||
Use Pango units instead of points.
|
||||
|
||||
``--rtl``
|
||||
|
||||
Set base direction to right-to-left.
|
||||
|
||||
``--rotate=degrees``
|
||||
|
||||
Set angle at which to rotate results,
|
||||
|
||||
``-n, --runs=integer``
|
||||
|
||||
Run Pango layout engine this many times.
|
||||
|
||||
``--single-par``
|
||||
|
||||
Enable single-paragraph mode.
|
||||
|
||||
``-t, --text=string``
|
||||
|
||||
Text to display (instead of a file).
|
||||
|
||||
``--waterfall``
|
||||
|
||||
Create a waterfall display.
|
||||
|
||||
``-w, --width=points``
|
||||
|
||||
Width in points to which to wrap lines or ellipsize.
|
||||
|
||||
``--wrap=word/char/word-char``
|
||||
|
||||
Text wrapping mode (needs a width to be set).
|
||||
|
||||
``--serialized=FILE``
|
||||
|
||||
Create layout from a serialized file,
|
||||
|
||||
``--serialize-to=FILE``
|
||||
|
||||
Serialize result to a file.
|
||||
|
||||
@@ -0,0 +1,112 @@
|
||||
[library]
|
||||
namespace = "Pango"
|
||||
version = "@PANGO_VERSION@"
|
||||
browse_url = "https://gitlab.gnome.org/GNOME/pango/"
|
||||
repository_url = "https://gitlab.gnome.org/GNOME/pango.git"
|
||||
docs_url = "https://docs.gtk.org/Pango"
|
||||
website_url = "https://www.pango.org"
|
||||
authors = "Owen Taylor, Behdad Esfahbod"
|
||||
logo_url = "pango-name.png"
|
||||
license = "LGPL-2.1-or-later"
|
||||
description = "Internationalized text layout and rendering"
|
||||
dependencies = [ "GObject-2.0", "HarfBuzz-0.0", "PangoCairo-1.0",
|
||||
"PangoFc-1.0", "PangoFT2-1.0", "PangoOT-1.0",
|
||||
"PangoXft-1.0" ]
|
||||
related = [ "PangoCairo-1.0", "PangoFc-1.0", "PangoFT2-1.0", "PangoOT-1.0",
|
||||
"PangoXft-1.0" ]
|
||||
devhelp = true
|
||||
search_index = true
|
||||
|
||||
[dependencies."GObject-2.0"]
|
||||
name = "GObject"
|
||||
description = "The base type system library"
|
||||
docs_url = "https://docs.gtk.org/gobject/"
|
||||
|
||||
[dependencies."HarfBuzz-0.0"]
|
||||
name = "HarfBuzz"
|
||||
description = "A text shaping library"
|
||||
docs_url = "https://harfbuzz.github.io/"
|
||||
|
||||
[related."PangoCairo-1.0"]
|
||||
name = "PangoCairo"
|
||||
description = "Cairo support for Pango"
|
||||
docs_url = "../PangoCairo/"
|
||||
|
||||
[related."PangoFc-1.0"]
|
||||
name = "PangoFc"
|
||||
description = "Fontconfig support for Pango"
|
||||
docs_url = "../PangoFc/"
|
||||
|
||||
[related."PangoFT2-1.0"]
|
||||
name = "PangoFT2"
|
||||
description = "FreeType support for Pango"
|
||||
docs_url = "../PangoFT2/"
|
||||
|
||||
[related."PangoOT-1.0"]
|
||||
name = "PangoOT"
|
||||
description = "OpenType support for Pango"
|
||||
docs_url = "../PangoOT/"
|
||||
|
||||
[related."PangoXft-1.0"]
|
||||
name = "PangoXft"
|
||||
description = "Xft support for Pango"
|
||||
docs_url = "../PangoXft/"
|
||||
|
||||
[theme]
|
||||
name = "basic"
|
||||
show_index_summary = true
|
||||
|
||||
[source-location]
|
||||
base_url = "https://gitlab.gnome.org/GNOME/pango/-/blob/main/"
|
||||
|
||||
[extra]
|
||||
content_files = [
|
||||
"pango_rendering.md",
|
||||
"pango_markup.md",
|
||||
"pango_fonts.md",
|
||||
"pango_bidi.md",
|
||||
"tools.md",
|
||||
]
|
||||
|
||||
content_images = [
|
||||
"pango-name.png",
|
||||
"layout-light.png",
|
||||
"layout-dark.png",
|
||||
"pipeline-light.png",
|
||||
"pipeline-dark.png",
|
||||
"rects1.png",
|
||||
"rects2.png",
|
||||
"rects3.png",
|
||||
"arabic-markup.png",
|
||||
"blue-text.png",
|
||||
"align-left.png",
|
||||
"align-center.png",
|
||||
"align-right.png",
|
||||
"align-left-justify.png",
|
||||
"align-center-justify.png",
|
||||
"align-right-justify.png",
|
||||
"vertical-light.png",
|
||||
"vertical-dark.png",
|
||||
"m-south.png",
|
||||
"m-west.png",
|
||||
"m-north.png",
|
||||
"m-east.png",
|
||||
"bidi-input-light.png",
|
||||
"bidi-input-dark.png",
|
||||
"bidi-annotate-light.png",
|
||||
"bidi-annotate-dark.png",
|
||||
"split-cursor-light.png",
|
||||
"split-cursor-dark.png",
|
||||
"fontmetrics-light.png",
|
||||
"fontmetrics-dark.png",
|
||||
"caret-metrics-light.png",
|
||||
"caret-metrics-dark.png",
|
||||
"cursor-positions-light.png",
|
||||
"cursor-positions-dark.png",
|
||||
"glyphstring-positions-light.png",
|
||||
"glyphstring-positions-dark.png",
|
||||
"baseline-shift-light.png",
|
||||
"baseline-shift-dark.png",
|
||||
]
|
||||
|
||||
urlmap_file = "urlmap.js"
|
||||
@@ -0,0 +1,65 @@
|
||||
pango_alignment_get_type
|
||||
pango_attr_iterator_get_type
|
||||
pango_attr_list_get_type
|
||||
pango_attr_type_get_type
|
||||
pango_attribute_get_type
|
||||
pango_bidi_type_get_type
|
||||
pango_cairo_fc_font_get_type
|
||||
pango_cairo_fc_font_map_get_type
|
||||
pango_cairo_font_get_type
|
||||
pango_cairo_font_map_get_type
|
||||
pango_cairo_renderer_get_type
|
||||
pango_color_get_type
|
||||
pango_context_get_type
|
||||
pango_coverage_get_type
|
||||
pango_coverage_level_get_type
|
||||
pango_direction_get_type
|
||||
pango_ellipsize_mode_get_type
|
||||
pango_engine_get_type
|
||||
pango_engine_lang_get_type
|
||||
pango_engine_shape_get_type
|
||||
pango_fc_decoder_get_type
|
||||
pango_fc_font_get_type
|
||||
pango_fc_font_map_get_type
|
||||
pango_font_description_get_type
|
||||
pango_font_face_get_type
|
||||
pango_font_family_get_type
|
||||
pango_font_get_type
|
||||
pango_font_map_get_type
|
||||
pango_font_mask_get_type
|
||||
pango_font_metrics_get_type
|
||||
pango_fontset_get_type
|
||||
pango_fontset_simple_get_type
|
||||
pango_ft2_font_get_type
|
||||
pango_ft2_font_map_get_type
|
||||
pango_ft2_renderer_get_type
|
||||
pango_glyph_item_get_type
|
||||
pango_glyph_item_iter_get_type
|
||||
pango_glyph_string_get_type
|
||||
pango_gravity_get_type
|
||||
pango_gravity_hint_get_type
|
||||
pango_item_get_type
|
||||
pango_language_get_type
|
||||
pango_layout_get_type
|
||||
pango_layout_iter_get_type
|
||||
pango_layout_line_get_type
|
||||
pango_matrix_get_type
|
||||
pango_ot_info_get_type
|
||||
pango_ot_ruleset_get_type
|
||||
pango_render_part_get_type
|
||||
pango_renderer_get_type
|
||||
pango_script_get_type
|
||||
pango_script_iter_get_type
|
||||
pango_shape_flags_get_type
|
||||
pango_show_flags_get_type
|
||||
pango_stretch_get_type
|
||||
pango_style_get_type
|
||||
pango_tab_align_get_type
|
||||
pango_tab_array_get_type
|
||||
pango_underline_get_type
|
||||
pango_variant_get_type
|
||||
pango_weight_get_type
|
||||
pango_wrap_mode_get_type
|
||||
pango_xft_font_get_type
|
||||
pango_xft_font_map_get_type
|
||||
pango_xft_renderer_get_type
|
||||
@@ -0,0 +1,79 @@
|
||||
---
|
||||
Title: Bidirectional and Vertical Text
|
||||
---
|
||||
|
||||
# Bidirectional Text
|
||||
|
||||
Pango supports bidirectional text (like Arabic and Hebrew) automatically.
|
||||
Some applications however, need some help to correctly handle bidirectional text.
|
||||
|
||||
The [enum@Pango.Direction] type can be used with [method@Pango.Context.set_base_dir]
|
||||
to instruct Pango about direction of text, though in most cases Pango detects
|
||||
that correctly and automatically. For application that need more direct
|
||||
control over bidirectional setting of text, Pango provides APIs such as
|
||||
[func@unichar_direction], [func@find_base_dir], [func@get_mirror_char]
|
||||
or [func@Pango.BidiType.for_unichar].
|
||||
|
||||
Here is an example for mixed-direction text (shown in logical order):
|
||||
|
||||
<picture>
|
||||
<source srcset="bidi-input-dark.png" media="(prefers-color-scheme: dark)">
|
||||
<img alt="mixed-direction text, logical order" src="bidi-input-light.png">
|
||||
</picture>
|
||||
|
||||
(the text to copy is: abאב12αβ )
|
||||
|
||||
Pango reorders the text according to the direction of the runs:
|
||||
|
||||
<picture>
|
||||
<source srcset="bidi-annotate-dark.png" media="(prefers-color-scheme: dark)">
|
||||
<img alt="mixed-direction text, visual order" src="bidi-annotate-light.png">
|
||||
</picture>
|
||||
|
||||
# Vertical Text
|
||||
|
||||
Pango is not only capable of vertical text layout, it can handle mixed vertical
|
||||
and non-vertical text correctly. This section describes the types used for setting
|
||||
vertical text parameters.
|
||||
|
||||
<picture>
|
||||
<source srcset="vertical-dark.png" media="(prefers-color-scheme: dark)">
|
||||
<img alt="gravity west, rotated 90 degrees" align="right" valign="top" src="vertical-light.png">
|
||||
</picture>
|
||||
The way this is implemented is through the concept of *gravity*. Gravity tells glyphs which way is down, so the gravity of normal Latin text is south. A gravity value of east means that glyphs will be rotated ninety degrees
|
||||
counterclockwise. So, to render vertical text one needs
|
||||
to set the gravity and rotate the layout using the matrix machinery already
|
||||
in place. This has the huge advantage that most algorithms working on a
|
||||
[class@Pango.Layout] do not need any change as the assumption that lines run
|
||||
in the X direction and stack in the Y direction holds even for vertical text
|
||||
layouts.
|
||||
|
||||
Here is an example for some English text rendered with gravity west, rotated 90 degrees:
|
||||
|
||||
Applications should only need to set base gravity on [class@Pango.Context] in use,
|
||||
and let Pango decide the gravity assigned to each run of text. This automatically
|
||||
handles text with mixed scripts. A very common use is to set the context base
|
||||
gravity to auto using [method@Pango.Context.set_base_gravity] and rotate the layout
|
||||
normally. Pango will make sure that Asian languages take the right form, while
|
||||
other scripts are rotated normally.
|
||||
|
||||
The correct way to set gravity on a layout is to set it on the context associated
|
||||
with it using [method@Pango.Context.set_base_gravity]. The context of a layout can
|
||||
be accessed using [method@Pango.Layout.get_context]. The currently set base gravity
|
||||
of the context can be accessed using [method@Pango.Context.get_base_gravity] and the
|
||||
*resolved* gravity of it using [method@Pango.Context.get_gravity]. The resolved
|
||||
gravity is the same as the base gravity for the most part, except that if the base
|
||||
gravity is set to `PANGO_GRAVITY_AUTO`, the resolved gravity will depend on the
|
||||
current matrix set on context, and is derived using [func@Pango.Gravity.get_for_matrix].
|
||||
|
||||
The next thing an application may want to set on the context is the *gravity hint*.
|
||||
A [enum@Pango.GravityHint] instructs how different scripts should react to the set
|
||||
base gravity.
|
||||
|
||||
Font descriptions have a gravity property too, that can be set using
|
||||
[method@Pango.FontDescription.set_gravity] and accessed using
|
||||
[method@Pango.FontDescription.get_gravity]. However, those are rarely useful
|
||||
from application code and are mainly used by `PangoLayout` internally.
|
||||
|
||||
Last but not least, one can create `PangoAttributes` for gravity and gravity
|
||||
hint using [func@attr_gravity_new] and [func@attr_gravity_hint_new].
|
||||
@@ -0,0 +1,129 @@
|
||||
---
|
||||
Title: Rendering with Cairo
|
||||
---
|
||||
|
||||
# Rendering with Cairo
|
||||
|
||||
The Cairo library is a vector graphics library with a powerful rendering model.
|
||||
It has such features as anti-aliased primitives, alpha-compositing, and gradients.
|
||||
Multiple backends for Cairo are available, to allow rendering to images, to PDF
|
||||
files, and to the screen on X and on other windowing systems. The functions in
|
||||
this section allow using Pango to render to Cairo surfaces.
|
||||
|
||||
Using Pango with Cairo is straightforward. A `PangoContext` created with
|
||||
pango_cairo_font_map_create_context() can be used on any Cairo context (`cairo_t`),
|
||||
but needs to be updated to match the current transformation matrix and target
|
||||
surface of the Cairo context using pango_cairo_update_context(). The convenience
|
||||
functions pango_cairo_create_layout() and pango_cairo_update_layout() handle
|
||||
the common case where the program doesn't need to manipulate the properties of
|
||||
the `PangoContext`.
|
||||
|
||||
When you get the metrics of a layout or of a piece of a layout using functions
|
||||
such as pango_layout_get_extents(), the reported metrics are in user-space
|
||||
coordinates. If a piece of text is 10 units long, and you call
|
||||
`cairo_scale (cr, 2.0)`, it still is more-or-less 10 units long. However, the
|
||||
results will be affected by hinting (that is, the process of adjusting the text
|
||||
to look good on the pixel grid), so you shouldn't assume they are completely
|
||||
independent of the current transformation matrix. Note that the basic metrics
|
||||
functions in Pango report results in integer Pango units. To get to the floating
|
||||
point units used in Cairo divide by `PANGO_SCALE`.
|
||||
|
||||
## Using Pango with Cairo
|
||||
|
||||
```
|
||||
#include <math.h>
|
||||
#include <pango/pangocairo.h>
|
||||
|
||||
#define RADIUS 150
|
||||
#define N_WORDS 10
|
||||
#define FONT "Sans Bold 27"
|
||||
|
||||
static void
|
||||
draw_text (cairo_t *cr)
|
||||
{
|
||||
PangoLayout *layout;
|
||||
PangoFontDescription *desc;
|
||||
int i;
|
||||
|
||||
/* Center coordinates on the middle of the region we are drawing */
|
||||
cairo_translate (cr, RADIUS, RADIUS);
|
||||
|
||||
/* Create a PangoLayout, set the font and text */
|
||||
layout = pango_cairo_create_layout (cr);
|
||||
|
||||
pango_layout_set_text (layout, "Text", -1);
|
||||
desc = pango_font_description_from_string (FONT);
|
||||
pango_layout_set_font_description (layout, desc);
|
||||
pango_font_description_free (desc);
|
||||
|
||||
/* Draw the layout N_WORDS times in a circle */
|
||||
for (i = 0; i < N_WORDS; i++)
|
||||
{
|
||||
int width, height;
|
||||
double angle = (360. * i) / N_WORDS;
|
||||
double red;
|
||||
|
||||
cairo_save (cr);
|
||||
|
||||
/* Gradient from red at angle == 60 to blue at angle == 240 */
|
||||
red = (1 + cos ((angle - 60) * G_PI / 180.)) / 2;
|
||||
cairo_set_source_rgb (cr, red, 0, 1.0 - red);
|
||||
|
||||
cairo_rotate (cr, angle * G_PI / 180.);
|
||||
|
||||
/* Inform Pango to re-layout the text with the new transformation */
|
||||
pango_cairo_update_layout (cr, layout);
|
||||
|
||||
pango_layout_get_size (layout, &width, &height);
|
||||
cairo_move_to (cr, - ((double)width / PANGO_SCALE) / 2, - RADIUS);
|
||||
pango_cairo_show_layout (cr, layout);
|
||||
|
||||
cairo_restore (cr);
|
||||
}
|
||||
|
||||
/* free the layout object */
|
||||
g_object_unref (layout);
|
||||
}
|
||||
|
||||
int
|
||||
main (int argc, char **argv)
|
||||
{
|
||||
cairo_t *cr;
|
||||
char *filename;
|
||||
cairo_status_t status;
|
||||
cairo_surface_t *surface;
|
||||
|
||||
if (argc != 2)
|
||||
{
|
||||
g_printerr ("Usage: cairosimple OUTPUT_FILENAME\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
filename = argv[1];
|
||||
|
||||
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
|
||||
2 * RADIUS, 2 * RADIUS);
|
||||
cr = cairo_create (surface);
|
||||
|
||||
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
|
||||
cairo_paint (cr);
|
||||
draw_text (cr);
|
||||
cairo_destroy (cr);
|
||||
|
||||
status = cairo_surface_write_to_png (surface, filename);
|
||||
cairo_surface_destroy (surface);
|
||||
|
||||
if (status != CAIRO_STATUS_SUCCESS)
|
||||
{
|
||||
g_printerr ("Could not save png to '%s'\n", filename);
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
```
|
||||
|
||||
Once you build and run the example code above, you should see the
|
||||
following result:
|
||||
|
||||
|
||||
@@ -0,0 +1,65 @@
|
||||
---
|
||||
Title: Fonts and Glyphs
|
||||
---
|
||||
|
||||
# Fonts
|
||||
|
||||
Pango supports a flexible architecture where a particular rendering architecture
|
||||
can supply an implementation of fonts. The `PangoFont` structure represents an
|
||||
abstract rendering-system-independent font. Pango provides routines to list
|
||||
available fonts, and to load a font matching a given description.
|
||||
|
||||
Conceptually, Pango groups fonts into faces and families which are identified
|
||||
by a name. A *font face* provides the different sizes of a single font style.
|
||||
A *font family* provides the available styles of a font.
|
||||
|
||||
As an example, "Helvetica" is a family, "Helvetica Bold" is a face of this
|
||||
family, and "Helvetica Bold 12pt" is a concrete font of this face.
|
||||
|
||||
# Font Enumeration
|
||||
|
||||
The central object for dealing with the available fonts on a system and caching
|
||||
loaded fonts is a [class@Pango.FontMap]. An application typically uses a single
|
||||
font map.
|
||||
|
||||
Since the font map depends on the rendering architecture in use, you'll need to
|
||||
use the backend function pango_cairo_font_map_get_default() to obtain the default
|
||||
fontmap. Depending on the platform, it will return a `PangoCairoFcFontMap`, a
|
||||
`PangoCairoWin32FontMap` or a `PangoCairoCoreTextFontMap`.
|
||||
|
||||
Once you have a fontmap, you can enumerate the available font families with
|
||||
[method@Pango.FontMap.list_families]. To enumerate the faces of a font family,
|
||||
use [method@Pango.FontFamily.list_faces].
|
||||
|
||||
# Font Descriptions
|
||||
|
||||
Since loading fonts uses system resources, Pango provides a way to describe
|
||||
a font without loading it. A [struct@Pango.FontDescription] is a struct that
|
||||
contains enough information to load a concrete font with
|
||||
[method@Pango.FontMap.load_font] or [method@Pango.Context.load_font]. You can
|
||||
obtain a font description from a font face using [method@Pango.FontFace.describe],
|
||||
or by parsing a string such as
|
||||
|
||||
Helvetica Bold 12pt
|
||||
|
||||
with [func@Pango.FontDescription.from_string].
|
||||
|
||||
# Glyphs
|
||||
|
||||
A font provides information about glyphs and how to position and render them.
|
||||
The Pango rendering pipeline uses this information to create a
|
||||
[struct@Pango.GlyphString], which contains the glyphs corresponding to the
|
||||
characters in the text and related information such as glyph positions and sizes,
|
||||
and clustering information (i.e. which glyphs correspond to which characters).
|
||||
|
||||
|
||||
|
||||
A glyph is identified by a [alias@Pango.Glyph], which is a numeric ID. Note that
|
||||
glyph IDs are font-specific: the same character can be represented by diffferent
|
||||
glyph IDs in different fonts.
|
||||
|
||||
The mapping between characters and glyphs is in general neither 1-1 nor a map:
|
||||
a single glyph may represent multiple characters (as is the case with ligatures),
|
||||
a single character may be represented by multiple glyphs (for example, when
|
||||
combining accents and base character), and in complex scripts, multiple characters
|
||||
may form clusters that get rearranged and represented by multiple glyphs.
|
||||
@@ -0,0 +1,249 @@
|
||||
---
|
||||
Title: Text Attributes and Markup
|
||||
---
|
||||
|
||||
# Text Attributes
|
||||
|
||||
Attributed text is used in a number of places in Pango. It is used as the
|
||||
input to the itemization process and also when creating a [class@Pango.Layout].
|
||||
|
||||
Attributes can influence the various stages of the rendering pipeline. For example,
|
||||
font or size attributes will influence the font selection that is happening during
|
||||
itemization, font features and letterspacing attributes will influence shaping, and
|
||||
color or underline attributes will be used for rendering.
|
||||
|
||||
Pango uses a simple structs for individual attributes, such as
|
||||
[struct@Pango.AttrColor] or [struct@Pango.AttrFontDesc]. Each attribute has a type,
|
||||
and a start and end index that determine the range of characters that the attribute
|
||||
applies to. See the [enum@Pango.AttrType] enumeration for all the possible
|
||||
attribute types.
|
||||
|
||||
Attributes rarely come alone. Pango uses the [struct@Pango.AttrList] structure
|
||||
to hold all attributes that apply to a piece of text.
|
||||
|
||||
# Pango Markup
|
||||
|
||||
Frequently, you want to display some text to the user with attributes applied to
|
||||
part of the text (for example, you might want bold or italicized words). With the
|
||||
base Pango interfaces, you could create a [struct@Pango.AttrList] and apply it to
|
||||
the text; the problem is that you'd need to apply attributes to some numeric range
|
||||
of characters, for example "characters 12-17." This is broken from an
|
||||
internationalization standpoint; once the text is translated, the word you wanted
|
||||
to italicize could be in a different position.
|
||||
|
||||
The solution is to include the text attributes in the string to be translated.
|
||||
Pango provides this feature with a small markup language. You can parse a marked-up
|
||||
string into the string text plus a [struct@Pango.AttrList] using either of
|
||||
[func@parse_markup] or [func@markup_parser_new].
|
||||
|
||||
A simple example of a marked-up string might be:
|
||||
|
||||
```
|
||||
<span foreground="blue" size="x-large">Blue text</span> is <i>cool</i>!
|
||||
```
|
||||
|
||||
|
||||
|
||||
A more elaborate example of using markup to color combining marks in
|
||||
Arabic text:
|
||||
|
||||
```
|
||||
<span foreground="purple">ا</span><span foreground="red">َ</span>ل<span foreground="blue">ْ</span>ع<span foreground="red">َ</span>ر<span foreground="red">َ</span>ب<span foreground="red">ِ</span>ي<span foreground="green">ّ</span><span foreground="red">َ</span>ة<span foreground="blue">ُ</span>
|
||||
```
|
||||
|
||||
|
||||
|
||||
Pango uses GMarkup to parse this language, which means that XML features
|
||||
such as numeric character entities such as `©` for © can be used too.
|
||||
|
||||
The root tag of a marked-up document is `<markup>`, but [func@Pango.parse_markup]
|
||||
allows you to omit this tag, so you will most likely never need to use it.
|
||||
The most general markup tag is `<span>`, then there are some convenience
|
||||
tags.
|
||||
|
||||
## The `<span>` Attributes
|
||||
|
||||
font
|
||||
font_desc
|
||||
: A font description string, such as "Sans Italic 12". See
|
||||
[func@Pango.FontDescription.from_string] for a description of the format of
|
||||
the string representation. Note that any other span attributes will override
|
||||
this description. So if you have "Sans Italic" and also a style="normal"
|
||||
attribute, you will get Sans normal, not italic.
|
||||
|
||||
font_family
|
||||
face
|
||||
: A font family name.
|
||||
|
||||
font_size
|
||||
size
|
||||
: Font size in 1024ths of a point, or in points (e.g. '12.5pt'), or one of the
|
||||
absolute sizes 'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large',
|
||||
'xx-large', or a percentage (e.g. '200%'), or one of the relative sizes 'smaller'
|
||||
or 'larger'.
|
||||
If you want to specify a absolute size, it's usually easier to take advantage
|
||||
of the ability to specify a partial font description using 'font'; you can use
|
||||
font='12.5' rather than size='12800' or size='12.5pt'.
|
||||
Support for specifying font sizes in points or as percentages was added in
|
||||
Pango 1.50.
|
||||
|
||||
font_style
|
||||
style
|
||||
: One of 'normal', 'oblique', 'italic'.
|
||||
|
||||
font_weight
|
||||
weight
|
||||
: One of 'ultralight', 'light', 'normal', 'bold', 'ultrabold', 'heavy', or a
|
||||
numeric weight.
|
||||
|
||||
font_variant
|
||||
variant
|
||||
: One of 'normal', 'small-caps', 'all-small-caps', 'petite-caps', 'all-petite-caps',
|
||||
'unicase', 'title-caps'. Values other than 'normal' and 'small-caps' are available
|
||||
since 1.50.
|
||||
|
||||
font_stretch
|
||||
stretch
|
||||
: One of 'ultracondensed', 'extracondensed',
|
||||
'condensed', 'semicondensed', 'normal', 'semiexpanded', 'expanded',
|
||||
'extraexpanded', 'ultraexpanded'.
|
||||
|
||||
font_features
|
||||
: A comma-separated list of OpenType font feature settings, in the same syntax as
|
||||
accepted by CSS. E.g: `font_features='dlig=1, -kern, afrc on'`.
|
||||
|
||||
foreground
|
||||
fgcolor
|
||||
color
|
||||
: An RGB color specification such as '#00FF00' or a color name such as 'red'.
|
||||
Since 1.38, an RGBA color specification such as '#00FF007F' will be interpreted
|
||||
as specifying both a foreground color and foreground alpha.
|
||||
|
||||
background
|
||||
bgcolor
|
||||
: An RGB color specification such as '#00FF00' or a color name such as 'red'.
|
||||
Since 1.38, an RGBA color specification such as '#00FF007F' will be interpreted
|
||||
as specifying both a background color and background alpha.
|
||||
|
||||
alpha
|
||||
fgalpha
|
||||
: An alpha value for the foreground color, either a plain integer between 1 and
|
||||
65536 or a percentage value like '50%'.
|
||||
|
||||
background_alpha
|
||||
bgalpha
|
||||
: An alpha value for the background color, either a plain integer between 1 and
|
||||
65536 or a percentage value like '50%'.
|
||||
|
||||
underline
|
||||
: One of 'none', 'single', 'double', 'low', 'error'.
|
||||
|
||||
underline_color
|
||||
: The color of underlines; an RGB color specification such as '#00FF00' or a color
|
||||
name such as 'red'.
|
||||
|
||||
overline
|
||||
: One of 'none' or 'single'. Overline support was added in Pango 1.46.
|
||||
|
||||
overline_color
|
||||
: The color of overlines; an RGB color specification such as '#00FF00' or a color
|
||||
name such as 'red'. Overline support was added in Pango 1.46.
|
||||
|
||||
rise
|
||||
: Vertical displacement, in Pango units or in points (e.g. '5pt'). Can be
|
||||
negative for subscript, positive for superscript.
|
||||
Support for specifying rise in points was added in Pango 1.50.
|
||||
|
||||
baseline_shift
|
||||
: Vertical displacement. In contrast to rise, baseline_shift attributes are cumulative.
|
||||
The value can be a length in Pango units or in points (e.g. '5pt'), or 'superscript'
|
||||
or 'subscript'. Available since 1.50.
|
||||
|
||||
font_scale:
|
||||
: Font size change. The possible values are 'superscript', 'subscript' or 'small-caps'.
|
||||
This is similar to the font_size values 'smaller' or 'larger', but uses font metrics
|
||||
to find the new size. Available since 1.50.
|
||||
|
||||
strikethrough
|
||||
: 'true' or 'false' whether to strike through the text.
|
||||
|
||||
strikethrough_color
|
||||
: The color of strikethrough lines; an RGB color specification such as '#00FF00'
|
||||
or a color name such as 'red'.
|
||||
|
||||
fallback
|
||||
: 'true' or 'false' whether to enable fallback. If disabled, then characters will
|
||||
only be used from the closest matching font on the system. No fallback will be
|
||||
done to other fonts on the system that might contain the characters in the text.
|
||||
Fallback is enabled by default. Most applications should not disable fallback.
|
||||
|
||||
lang
|
||||
: A language code, indicating the text language.
|
||||
|
||||
letter_spacing
|
||||
: Inter-letter spacing in 1024ths of a point.
|
||||
|
||||
gravity
|
||||
: One of 'south', 'east', 'north', 'west', 'auto'.
|
||||
|
||||
gravity_hint
|
||||
: One of 'natural', 'strong', 'line'.
|
||||
|
||||
show
|
||||
: Specifies what special characters to show visibly. The value can be 'none'
|
||||
or a combination of 'spaces', 'line-breaks' and 'ignorables', combined with '|'.
|
||||
Support for showing special characters was added in Pango 1.44.
|
||||
|
||||
insert_hyphens
|
||||
: 'true' or 'false' to indicate whether hyphens should be inserted when breaking
|
||||
lines in the middle of words. Available since Pango 1.44.
|
||||
|
||||
allow_breaks
|
||||
: 'true' or 'false' to indicate whether breaking lines is allowed. Available
|
||||
since Pango 1.44.
|
||||
|
||||
line_height
|
||||
: Overrides the line height. The value can be either a factor (< 1024) that is
|
||||
used to scale up the logical extents of runs or an absolute value (in 1024th
|
||||
of a point).
|
||||
Available since Pango 1.50.
|
||||
|
||||
text_transform
|
||||
: Specifies how characters are transformed during shaping. The values can be
|
||||
'none', 'lowercase', 'uppercase' or 'capitalize'. Support for text transformation
|
||||
was added in Pango 1.50.
|
||||
|
||||
segment
|
||||
: Overrides word or sentence boundaries. The value can be 'word' or 'sentence',
|
||||
to indicate that the span should be treated as a single word or sentence.
|
||||
Overlapping segments will be split to allow this, and line breaks will be
|
||||
adjusted accordingly. Available since Pango 1.50.
|
||||
|
||||
## Convenience Tags
|
||||
|
||||
`<b>`
|
||||
: Bold
|
||||
|
||||
`<big>`
|
||||
: Makes font relatively larger, equivalent to `<span size="larger">`
|
||||
|
||||
`<i>`
|
||||
: Italic
|
||||
|
||||
`<s>`
|
||||
: Strikethrough
|
||||
|
||||
`<sub>`
|
||||
: Subscript
|
||||
|
||||
`<sup>`
|
||||
: Superscript
|
||||
|
||||
`<small>`
|
||||
: Makes font relatively smaller, equivalent to `<span size="smaller">`
|
||||
|
||||
`<tt>`
|
||||
: Monospace font
|
||||
|
||||
`<u>`
|
||||
: Underline
|
||||
@@ -0,0 +1,40 @@
|
||||
---
|
||||
Title: The Rendering Pipeline
|
||||
---
|
||||
|
||||
# The Rendering Pipeline
|
||||
|
||||
The Pango rendering pipeline takes a string of Unicode characters, converts them
|
||||
it into glyphs, and renders them on some output medium. This section describes the
|
||||
various stages of this pipeline and the APIs that implement them.
|
||||
|
||||
<picture>
|
||||
<source srcset="pipeline-dark.png" media="(prefers-color-scheme: dark)">
|
||||
<img alt="Pango Rendering Pipeline" src="pipeline-light.png">
|
||||
</picture>
|
||||
|
||||
Itemization
|
||||
: breaks a piece of text into segments with consistent direction and shaping
|
||||
properties. Among other things, this determines which font to use for each
|
||||
character. Use [func@Pango.itemize] or [func@Pango.itemize_with_base_dir]
|
||||
to itemize text.
|
||||
|
||||
Shaping
|
||||
: converts characters into glyphs. Use [func@Pango.shape],
|
||||
[func@Pango.shape_full] or [func@Pango.shape_item] to shape text.
|
||||
|
||||
Line Breaking
|
||||
: determines where line breaks should be inserted into a sequence of glyphs.
|
||||
The functions [func@Pango.default_break], [func@Pango.tailor_break] and
|
||||
[func@Pango.attr_break] determine possible line breaks. The actual line
|
||||
breaking is done by [class@Pango.Layout].
|
||||
|
||||
Justification
|
||||
: adjusts inter-word spacing to form lines of even length. This is done by
|
||||
[class@Pango.Layout].
|
||||
|
||||
Rendering
|
||||
: takes a string of positioned glyphs, and renders them onto a surface.
|
||||
This is accomplished by a [class@Pango.Renderer] object. The functions
|
||||
pango_cairo_show_glyph_string() and pango_cairo_show_layout() use a
|
||||
[class@Pango.Renderer] to draw text onto a cairo surface.
|
||||
@@ -0,0 +1,26 @@
|
||||
Title: Xft Fonts and Rendering
|
||||
|
||||
The Xft library is a library for displaying fonts on the X window
|
||||
system; internally it uses the fontconfig library to locate font
|
||||
files, and the FreeType library to load and render fonts. The
|
||||
Xft backend is the recommended Pango font backend for screen
|
||||
display with X. (The Cairo back end is another possibility.)
|
||||
|
||||
Using the Xft backend is generally straightforward;
|
||||
[func@PangoXft.get_context] creates a context for a specified display
|
||||
and screen. You can then create a [class@Pango.Layout] with that context
|
||||
and render it with [func@PangoXft.render_layout]. At a more advanced
|
||||
level, the low-level fontconfig options used for rendering fonts
|
||||
can be affected using [func@PangoXft.set_default_substitute], and
|
||||
[func@PangoXft.substitute_changed].
|
||||
|
||||
A range of functions for drawing pieces of a layout, such as individual
|
||||
layout lines and glyphs strings are provided. You can also directly
|
||||
create a [class@PangoXft.Renderer]. Finally, in some advanced cases,
|
||||
it is useful to derive from [class@PangoXft.Renderer]. Deriving from
|
||||
[class@PangoXft.Renderer] is useful for two reasons. One reason is be
|
||||
to support custom attributes by overriding `PangoRendererClass` virtual
|
||||
functions like 'prepare_run' or 'draw_shape'. The other reason is to
|
||||
customize exactly how the final bits are drawn to the destination by
|
||||
overriding the `PangoXftRendererClass` virtual functions
|
||||
'composite_glyphs' and 'composite_trapezoids'.
|
||||
@@ -0,0 +1,43 @@
|
||||
[library]
|
||||
namespace = "PangoCairo"
|
||||
version = "@PANGO_VERSION@"
|
||||
browse_url = "https://gitlab.gnome.org/GNOME/pango/"
|
||||
repository_url = "https://gitlab.gnome.org/GNOME/pango.git"
|
||||
docs_url = "https://docs.gtk.org/PangoCairo"
|
||||
website_url = "https://www.pango.org"
|
||||
authors = "Owen Taylor, Behdad Esfahbod"
|
||||
logo_url = "pango-name.png"
|
||||
license = "LGPL-2.1-or-later"
|
||||
description = "Cairo support for Pango"
|
||||
dependencies = [ "Pango-1.0", "cairo-1.0" ]
|
||||
devhelp = true
|
||||
search_index = true
|
||||
|
||||
[dependencies."Pango-1.0"]
|
||||
name = "Pango"
|
||||
description = "A library for layout out and rendering of text"
|
||||
docs_url = "../Pango/"
|
||||
|
||||
[dependencies."cairo-1.0"]
|
||||
name = "cairo"
|
||||
description = "A vector graphics library"
|
||||
docs_url = "https://www.cairographics.org/manual/"
|
||||
|
||||
[theme]
|
||||
name = "basic"
|
||||
show_index_summary = true
|
||||
|
||||
[source-location]
|
||||
base_url = "https://gitlab.gnome.org/GNOME/pango/-/blob/main/"
|
||||
|
||||
[extra]
|
||||
content_files = [
|
||||
"pango_cairo.md",
|
||||
]
|
||||
|
||||
content_images = [
|
||||
"pango-name.png",
|
||||
"rotated-text.png"
|
||||
]
|
||||
|
||||
urlmap_file = "urlmap.js"
|
||||
@@ -0,0 +1,40 @@
|
||||
[library]
|
||||
namespace = "PangoFc"
|
||||
version = "@PANGO_VERSION@"
|
||||
browse_url = "https://gitlab.gnome.org/GNOME/pango/"
|
||||
repository_url = "https://gitlab.gnome.org/GNOME/pango.git"
|
||||
docs_url = "https://docs.gtk.org/PangoFc"
|
||||
website_url = "https://www.pango.org"
|
||||
authors = "Owen Taylor, Behdad Esfahbod"
|
||||
logo_url = "pango-name.png"
|
||||
license = "LGPL-2.1-or-later"
|
||||
description = "Fontconfig support for Pango"
|
||||
dependencies = [ "Pango-1.0", "fontconfig-2.0" ]
|
||||
devhelp = true
|
||||
search_index = true
|
||||
|
||||
[dependencies."Pango-1.0"]
|
||||
name = "Pango"
|
||||
description = "A library for layout out and rendering of text"
|
||||
docs_url = "../Pango/"
|
||||
|
||||
[dependencies."fontconfig-2.0"]
|
||||
name = "fontconfig"
|
||||
description = "A font configuration and enumeration library"
|
||||
docs_url = "https://www.fontconfig.org"
|
||||
|
||||
[theme]
|
||||
name = "basic"
|
||||
show_index_summary = true
|
||||
|
||||
[source-location]
|
||||
base_url = "https://gitlab.gnome.org/GNOME/pango/-/blob/main/"
|
||||
|
||||
[extra]
|
||||
|
||||
content_images = [
|
||||
"pango-name.png"
|
||||
]
|
||||
|
||||
urlmap_file = "urlmap.js"
|
||||
|
||||
@@ -0,0 +1,40 @@
|
||||
[library]
|
||||
namespace = "PangoFT2"
|
||||
version = "@PANGO_VERSION@"
|
||||
browse_url = "https://gitlab.gnome.org/GNOME/pango/"
|
||||
repository_url = "https://gitlab.gnome.org/GNOME/pango.git"
|
||||
docs_url = "https://docs.gtk.org/PangoFT2"
|
||||
website_url = "https://www.pango.org"
|
||||
authors = "Owen Taylor, Behdad Esfahbod"
|
||||
logo_url = "pango-name.png"
|
||||
license = "LGPL-2.1-or-later"
|
||||
description = "FreeType support for Pango"
|
||||
dependencies = [ "Pango-1.0", "freetype2-2.0" ]
|
||||
devhelp = true
|
||||
search_index = true
|
||||
|
||||
[dependencies."Pango-1.0"]
|
||||
name = "Pango"
|
||||
description = "A library for layout out and rendering of text"
|
||||
docs_url = "../Pango/"
|
||||
|
||||
[dependencies."freetype2-2.0"]
|
||||
name = "freetype2"
|
||||
description = "A font loading and rendering library"
|
||||
docs_url = "https://www.freetype.org"
|
||||
|
||||
[theme]
|
||||
name = "basic"
|
||||
show_index_summary = true
|
||||
|
||||
[source-location]
|
||||
base_url = "https://gitlab.gnome.org/GNOME/pango/-/blob/main/"
|
||||
|
||||
[extra]
|
||||
|
||||
content_images = [
|
||||
"pango-name.png"
|
||||
]
|
||||
|
||||
urlmap_file = "urlmap.js"
|
||||
|
||||
@@ -0,0 +1,34 @@
|
||||
[library]
|
||||
namespace = "PangoOT"
|
||||
version = "@PANGO_VERSION@"
|
||||
browse_url = "https://gitlab.gnome.org/GNOME/pango/"
|
||||
repository_url = "https://gitlab.gnome.org/GNOME/pango.git"
|
||||
docs_url = "https://docs.gtk.org/PangoOT"
|
||||
website_url = "https://www.pango.org"
|
||||
authors = "Owen Taylor, Behdad Esfahbod"
|
||||
logo_url = "pango-name.png"
|
||||
license = "LGPL-2.1-or-later"
|
||||
description = "OpenType support for Pango"
|
||||
dependencies = [ "Pango-1.0" ]
|
||||
devhelp = true
|
||||
search_index = true
|
||||
|
||||
[dependencies."Pango-1.0"]
|
||||
name = "Pango"
|
||||
description = "A library for layout out and rendering of text"
|
||||
docs_url = "../Pango/"
|
||||
|
||||
[theme]
|
||||
name = "basic"
|
||||
show_index_summary = true
|
||||
|
||||
[source-location]
|
||||
base_url = "https://gitlab.gnome.org/GNOME/pango/-/blob/main/"
|
||||
|
||||
[extra]
|
||||
|
||||
content_images = [
|
||||
"pango-name.png"
|
||||
]
|
||||
|
||||
urlmap_file = "urlmap.js"
|
||||
@@ -0,0 +1,42 @@
|
||||
[library]
|
||||
namespace = "PangoXft"
|
||||
version = "@PANGO_VERSION@"
|
||||
browse_url = "https://gitlab.gnome.org/GNOME/pango/"
|
||||
repository_url = "https://gitlab.gnome.org/GNOME/pango.git"
|
||||
docs_url = "https://docs.gtk.org/PangoXft"
|
||||
website_url = "https://www.pango.org"
|
||||
authors = "Owen Taylor, Behdad Esfahbod"
|
||||
logo_url = "pango-name.png"
|
||||
license = "LGPL-2.1-or-later"
|
||||
description = "Xft support for Pango"
|
||||
dependencies = [ "Pango-1.0", "xft-2.0" ]
|
||||
devhelp = true
|
||||
search_index = true
|
||||
|
||||
[dependencies."Pango-1.0"]
|
||||
name = "Pango"
|
||||
description = "A library for layout out and rendering of text"
|
||||
docs_url = "../Pango/"
|
||||
|
||||
[dependencies."xft-2.0"]
|
||||
name = "xft"
|
||||
description = "X11 client-side font rendering library"
|
||||
docs_url = "https://x.org"
|
||||
|
||||
[theme]
|
||||
name = "basic"
|
||||
show_index_summary = true
|
||||
|
||||
[source-location]
|
||||
base_url = "https://gitlab.gnome.org/GNOME/pango/-/blob/main/"
|
||||
|
||||
[extra]
|
||||
content_files = [
|
||||
"pango_xft.md"
|
||||
]
|
||||
|
||||
content_images = [
|
||||
"pango-name.png"
|
||||
]
|
||||
|
||||
urlmap_file = "urlmap.js"
|
||||
Binary file not shown.
|
After Width: | Height: | Size: 9.7 KiB |
Binary file not shown.
|
After Width: | Height: | Size: 9.4 KiB |
Binary file not shown.
|
After Width: | Height: | Size: 3.1 KiB |
@@ -0,0 +1,251 @@
|
||||
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<svg
|
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xmlns:dc="http://purl.org/dc/elements/1.1/"
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xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
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xmlns:svg="http://www.w3.org/2000/svg"
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xmlns="http://www.w3.org/2000/svg"
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sodipodi:docname="pipeline.svg"
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<metadata
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id="metadata965">
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<rdf:RDF>
|
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<cc:Work
|
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rdf:about="">
|
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<dc:format>image/svg+xml</dc:format>
|
||||
<dc:type
|
||||
rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
|
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<dc:title></dc:title>
|
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</cc:Work>
|
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</rdf:RDF>
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inkscape:stockid="Arrow2Mend"
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inkscape:isstock="true">
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inkscape:connector-curvature="0" />
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inkscape:pageopacity="0"
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<text
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xml:space="preserve"
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x="702.94543"
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y="169.18546"
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id="text1281"><tspan
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sodipodi:role="line"
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id="tspan1279"
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x="702.94543"
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y="169.18546">Justification</tspan></text>
|
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<text
|
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xml:space="preserve"
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xml:space="preserve"
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id="text1289"><tspan
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sodipodi:role="line"
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id="tspan1291"
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x="136.84364"
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y="169.70181">Itemization</tspan></text>
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<text
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xml:space="preserve"
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style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:18.66666603px;line-height:1.25;font-family:Cantarell;-inkscape-font-specification:'Cantarell, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none"
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x="311.20001"
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y="169.70181"
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id="text1295"><tspan
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sodipodi:role="line"
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id="tspan1293"
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x="311.20001"
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y="169.70181">Shaping</tspan></text>
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<text
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xml:space="preserve"
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style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:18.66666603px;line-height:1.25;font-family:Cantarell;-inkscape-font-specification:'Cantarell, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none"
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x="496.31274"
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y="169.70181"
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id="text1299"><tspan
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sodipodi:role="line"
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id="tspan1297"
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x="496.31274"
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y="169.70181">Line Breaking</tspan></text>
|
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<text
|
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xml:space="preserve"
|
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style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:18.66666603px;line-height:1.25;font-family:Cantarell;-inkscape-font-specification:'Cantarell, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:center;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none"
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x="893.9491"
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y="169.56364"
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id="text1303"><tspan
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sodipodi:role="line"
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id="tspan1301"
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x="893.9491"
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y="169.56364">Rendering</tspan></text>
|
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</g>
|
||||
</svg>
|
||||
|
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|
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|
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|
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|
After Width: | Height: | Size: 11 KiB |
@@ -0,0 +1,9 @@
|
||||
Title: Tools and Demos
|
||||
|
||||
Pango ships with a number of tools and demos that come with their own
|
||||
documentation in the form of man pages.
|
||||
|
||||
- [pango-view](pango-view.html)
|
||||
- [pango-list](pango-list.html)
|
||||
- [pango-segmentation](pango-segmentation.html)
|
||||
|
||||
@@ -0,0 +1,11 @@
|
||||
// SPDX-FileCopyrightText: 2021 GNOME Foundation
|
||||
// SPDX-License-Identifier: LGPL-2.1-or-later
|
||||
|
||||
// A map between namespaces and base URLs for their online documentation
|
||||
baseURLs = [
|
||||
[ 'GLib', 'https://docs.gtk.org/glib/' ],
|
||||
[ 'GObject', 'https://docs.gtk.org/gobject/' ],
|
||||
[ 'Gio', 'https://docs.gtk.org/gio/' ],
|
||||
[ 'Pango', 'https://docs.gtk.org/Pango/' ],
|
||||
[ 'PangoCairo', 'https://docs.gtk.org/PangoCairo/' ],
|
||||
]
|
||||
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|
After Width: | Height: | Size: 10 KiB |
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|
After Width: | Height: | Size: 9.7 KiB |
@@ -0,0 +1,236 @@
|
||||
/* Example code to show how to use pangocairo to render arbitrary shapes
|
||||
* inside a text layout, positioned by Pango. This has become possibly
|
||||
* using the following API added in Pango 1.18:
|
||||
*
|
||||
* pango_cairo_context_set_shape_renderer ()
|
||||
*
|
||||
* This examples uses a small parser to convert shapes in the format of
|
||||
* SVG paths to cairo instructions. You can typically extract these from
|
||||
* the SVG file's <path> elements directly.
|
||||
*
|
||||
* The code then searches for the Unicode bullet character in the layout
|
||||
* text and automatically adds PangoAttribtues to the layout to replace
|
||||
* each of the with a rendering of the GNOME Foot logo.
|
||||
*
|
||||
*
|
||||
* Written by Behdad Esfahbod, 2007
|
||||
*
|
||||
* Permission to use, copy, modify, distribute, and sell this example
|
||||
* for any purpose is hereby granted without fee.
|
||||
* It is provided "as is" without express or implied warranty.
|
||||
*/
|
||||
|
||||
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
|
||||
#include <pango/pangocairo.h>
|
||||
|
||||
#define BULLET "•"
|
||||
|
||||
const char text[] =
|
||||
"The GNOME project provides two things:\n"
|
||||
"\n"
|
||||
" • The GNOME desktop environment\n"
|
||||
" • The GNOME development platform\n"
|
||||
" • Planet GNOME";
|
||||
|
||||
typedef struct {
|
||||
double width, height;
|
||||
const char *path;
|
||||
} MiniSvg;
|
||||
|
||||
static MiniSvg GnomeFootLogo = {
|
||||
96.2152, 118.26,
|
||||
"M 86.068,1 C 61.466,0 56.851,35.041 70.691,35.041 C 84.529,35.041 110.671,0 86.068,0 z "
|
||||
"M 45.217,30.699 C 52.586,31.149 60.671,2.577 46.821,4.374 C 32.976,6.171 37.845,30.249 45.217,30.699 z "
|
||||
"M 11.445,48.453 C 16.686,46.146 12.12,23.581 3.208,29.735 C -5.7,35.89 6.204,50.759 11.445,48.453 z "
|
||||
"M 26.212,36.642 C 32.451,35.37 32.793,9.778 21.667,14.369 C 10.539,18.961 19.978,37.916 26.212,36.642 L 26.212,36.642 z "
|
||||
"M 58.791,93.913 C 59.898,102.367 52.589,106.542 45.431,101.092 C 22.644,83.743 83.16,75.088 79.171,51.386 C 75.86,31.712 15.495,37.769 8.621,68.553 C 3.968,89.374 27.774,118.26 52.614,118.26 C 64.834,118.26 78.929,107.226 81.566,93.248 C 83.58,82.589 57.867,86.86 58.791,93.913 L 58.791,93.913 z "
|
||||
"\0"
|
||||
};
|
||||
|
||||
static void
|
||||
mini_svg_render (MiniSvg *shape,
|
||||
cairo_t *cr,
|
||||
gboolean do_path)
|
||||
{
|
||||
double x, y;
|
||||
const char *p;
|
||||
char op[2];
|
||||
int len;
|
||||
|
||||
cairo_get_current_point (cr, &x, &y);
|
||||
cairo_translate (cr, x, y);
|
||||
|
||||
for (p = shape->path; sscanf (p, "%1s %n", op, &len), p += len, *p;)
|
||||
switch (*op)
|
||||
{
|
||||
case 'M':
|
||||
{
|
||||
sscanf (p, "%lf,%lf %n", &x, &y, &len); p += len;
|
||||
cairo_move_to (cr, x, y);
|
||||
break;
|
||||
}
|
||||
case 'L':
|
||||
{
|
||||
sscanf (p, "%lf,%lf %n", &x, &y, &len); p += len;
|
||||
cairo_line_to (cr, x, y);
|
||||
break;
|
||||
}
|
||||
case 'C':
|
||||
{
|
||||
double x1, y1, x2, y2, x3, y3;
|
||||
sscanf (p, "%lf,%lf %lf,%lf %lf,%lf %n", &x1, &y1, &x2, &y2, &x3, &y3, &len); p += len;
|
||||
cairo_curve_to (cr, x1, y1, x2, y2, x3, y3);
|
||||
break;
|
||||
}
|
||||
case 'z':
|
||||
{
|
||||
cairo_close_path (cr);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
{
|
||||
g_warning ("Invalid MiniSvg operation '%c'", *op);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!do_path)
|
||||
cairo_fill (cr);
|
||||
}
|
||||
|
||||
static void
|
||||
mini_svg_shape_renderer (cairo_t *cr,
|
||||
PangoAttrShape *attr,
|
||||
gboolean do_path,
|
||||
gpointer data G_GNUC_UNUSED)
|
||||
{
|
||||
MiniSvg *shape = (MiniSvg *) attr->data;
|
||||
double scale_x, scale_y;
|
||||
|
||||
scale_x = (double) attr->ink_rect.width / (PANGO_SCALE * shape->width );
|
||||
scale_y = (double) attr->ink_rect.height / (PANGO_SCALE * shape->height);
|
||||
|
||||
cairo_rel_move_to (cr,
|
||||
(double) attr->ink_rect.x / PANGO_SCALE,
|
||||
(double) attr->ink_rect.y / PANGO_SCALE);
|
||||
cairo_scale (cr, scale_x, scale_y);
|
||||
|
||||
mini_svg_render (shape, cr, do_path);
|
||||
}
|
||||
|
||||
|
||||
static PangoLayout *
|
||||
get_layout (cairo_t *cr)
|
||||
{
|
||||
PangoLayout *layout;
|
||||
PangoAttrList *attrs;
|
||||
PangoRectangle ink_rect = {1 * PANGO_SCALE, -11 * PANGO_SCALE, 8 * PANGO_SCALE, 10 * PANGO_SCALE};
|
||||
PangoRectangle logical_rect = {0 * PANGO_SCALE, -12 * PANGO_SCALE, 10 * PANGO_SCALE, 12 * PANGO_SCALE};
|
||||
const char *p;
|
||||
|
||||
/* Create a PangoLayout, set the font and text */
|
||||
layout = pango_cairo_create_layout (cr);
|
||||
|
||||
pango_cairo_context_set_shape_renderer (pango_layout_get_context (layout),
|
||||
mini_svg_shape_renderer, NULL, NULL);
|
||||
|
||||
pango_layout_set_text (layout, text, -1);
|
||||
|
||||
attrs = pango_attr_list_new ();
|
||||
|
||||
/* Set gnome shape attributes for all bullets */
|
||||
for (p = text; (p = strstr (p, BULLET)); p += strlen (BULLET))
|
||||
{
|
||||
PangoAttribute *attr;
|
||||
|
||||
attr = pango_attr_shape_new_with_data (&ink_rect,
|
||||
&logical_rect,
|
||||
&GnomeFootLogo,
|
||||
NULL, NULL);
|
||||
|
||||
attr->start_index = p - text;
|
||||
attr->end_index = attr->start_index + strlen (BULLET);
|
||||
|
||||
pango_attr_list_insert (attrs, attr);
|
||||
}
|
||||
|
||||
pango_layout_set_attributes (layout, attrs);
|
||||
pango_attr_list_unref (attrs);
|
||||
|
||||
return layout;
|
||||
}
|
||||
|
||||
static void
|
||||
draw_text (cairo_t *cr, int *width, int *height)
|
||||
{
|
||||
|
||||
PangoLayout *layout = get_layout (cr);
|
||||
|
||||
/* Adds a fixed 10-pixel margin on the sides. */
|
||||
|
||||
if (width || height)
|
||||
{
|
||||
pango_layout_get_pixel_size (layout, width, height);
|
||||
if (width)
|
||||
*width += 20;
|
||||
if (height)
|
||||
*height += 20;
|
||||
}
|
||||
|
||||
cairo_move_to (cr, 10, 10);
|
||||
pango_cairo_show_layout (cr, layout);
|
||||
|
||||
g_object_unref (layout);
|
||||
}
|
||||
|
||||
int main (int argc, char **argv)
|
||||
{
|
||||
cairo_t *cr;
|
||||
char *filename;
|
||||
cairo_status_t status;
|
||||
cairo_surface_t *surface;
|
||||
int width, height;
|
||||
|
||||
if (argc != 2)
|
||||
{
|
||||
g_printerr ("Usage: cairoshape OUTPUT_FILENAME\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
filename = argv[1];
|
||||
|
||||
/* First create and use a 0x0 surface, to measure how large
|
||||
* the final surface needs to be */
|
||||
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
|
||||
0, 0);
|
||||
cr = cairo_create (surface);
|
||||
draw_text (cr, &width, &height);
|
||||
cairo_destroy (cr);
|
||||
cairo_surface_destroy (surface);
|
||||
|
||||
/* Now create the final surface and draw to it. */
|
||||
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
|
||||
width, height);
|
||||
cr = cairo_create (surface);
|
||||
|
||||
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
|
||||
cairo_paint (cr);
|
||||
cairo_set_source_rgb (cr, 0.0, 0.0, 0.5);
|
||||
draw_text (cr, NULL, NULL);
|
||||
cairo_destroy (cr);
|
||||
|
||||
/* Write out the surface as PNG */
|
||||
status = cairo_surface_write_to_png (surface, filename);
|
||||
cairo_surface_destroy (surface);
|
||||
|
||||
if (status != CAIRO_STATUS_SUCCESS)
|
||||
{
|
||||
g_printerr ("Could not save png to '%s'\n", filename);
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,106 @@
|
||||
/* Simple example to use pangocairo to render rotated text */
|
||||
|
||||
#include <math.h>
|
||||
#include <pango/pangocairo.h>
|
||||
|
||||
static void
|
||||
draw_text (cairo_t *cr)
|
||||
{
|
||||
#define RADIUS 200
|
||||
#define N_WORDS 8
|
||||
#define FONT_WITH_MANUAL_SIZE "Times new roman,Sans"
|
||||
#define FONT_SIZE 36
|
||||
#define DEVICE_DPI 72
|
||||
|
||||
/* The following number applies a cairo CTM. Tests for
|
||||
* https://bugzilla.gnome.org/show_bug.cgi?id=700592
|
||||
*/
|
||||
#define TWEAKABLE_SCALE ((double) 0.1)
|
||||
|
||||
PangoLayout *layout;
|
||||
PangoFontDescription *desc;
|
||||
int i;
|
||||
|
||||
/* Center coordinates on the middle of the region we are drawing
|
||||
*/
|
||||
cairo_translate (cr, RADIUS / TWEAKABLE_SCALE, RADIUS / TWEAKABLE_SCALE);
|
||||
|
||||
/* Create a PangoLayout, set the font and text */
|
||||
layout = pango_cairo_create_layout (cr);
|
||||
|
||||
pango_layout_set_text (layout, "Test\nسَلام", -1);
|
||||
|
||||
desc = pango_font_description_from_string (FONT_WITH_MANUAL_SIZE);
|
||||
pango_font_description_set_absolute_size(desc, FONT_SIZE * DEVICE_DPI * PANGO_SCALE / (72.0 * TWEAKABLE_SCALE));
|
||||
//pango_font_description_set_size(desc, 27 * PANGO_SCALE / TWEAKABLE_SCALE);
|
||||
|
||||
printf("PANGO_SCALE = %d\n", PANGO_SCALE);
|
||||
pango_layout_set_font_description (layout, desc);
|
||||
pango_font_description_free (desc);
|
||||
|
||||
/* Draw the layout N_WORDS times in a circle */
|
||||
for (i = 0; i < N_WORDS; i++)
|
||||
{
|
||||
int width, height;
|
||||
double angle = (360. * i) / N_WORDS;
|
||||
double red;
|
||||
|
||||
cairo_save (cr);
|
||||
|
||||
/* Gradient from red at angle == 60 to blue at angle == 240 */
|
||||
red = (1 + cos ((angle - 60) * G_PI / 180.)) / 2;
|
||||
cairo_set_source_rgb (cr, red, 0, 1.0 - red);
|
||||
|
||||
cairo_rotate (cr, angle * G_PI / 180.);
|
||||
|
||||
/* Inform Pango to re-layout the text with the new transformation */
|
||||
pango_cairo_update_layout (cr, layout);
|
||||
|
||||
pango_layout_get_size (layout, &width, &height);
|
||||
cairo_move_to (cr,( - (((double)width) / PANGO_SCALE) / 2.0) , (- RADIUS) / TWEAKABLE_SCALE);
|
||||
pango_cairo_show_layout (cr, layout);
|
||||
|
||||
cairo_restore (cr);
|
||||
}
|
||||
|
||||
/* free the layout object */
|
||||
g_object_unref (layout);
|
||||
}
|
||||
|
||||
int main (int argc, char **argv)
|
||||
{
|
||||
cairo_t *cr;
|
||||
char *filename;
|
||||
cairo_status_t status;
|
||||
cairo_surface_t *surface;
|
||||
|
||||
if (argc != 2)
|
||||
{
|
||||
g_printerr ("Usage: cairosimple OUTPUT_FILENAME\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
filename = argv[1];
|
||||
|
||||
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
|
||||
2 * RADIUS, 2 * RADIUS);
|
||||
cr = cairo_create (surface);
|
||||
|
||||
cairo_scale(cr, 1 * TWEAKABLE_SCALE, 1 * TWEAKABLE_SCALE);
|
||||
|
||||
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
|
||||
cairo_paint (cr);
|
||||
draw_text (cr);
|
||||
cairo_destroy (cr);
|
||||
|
||||
status = cairo_surface_write_to_png (surface, filename);
|
||||
cairo_surface_destroy (surface);
|
||||
|
||||
if (status != CAIRO_STATUS_SUCCESS)
|
||||
{
|
||||
g_printerr ("Could not save png to '%s'\n", filename);
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,625 @@
|
||||
/* Example code to show how to use pangocairo to render text
|
||||
* projected on a path.
|
||||
*
|
||||
*
|
||||
* Written by Behdad Esfahbod, 2006..2007
|
||||
*
|
||||
* Permission to use, copy, modify, distribute, and sell this example
|
||||
* for any purpose is hereby granted without fee.
|
||||
* It is provided "as is" without express or implied warranty.
|
||||
*/
|
||||
|
||||
#include <math.h>
|
||||
#include <stdlib.h>
|
||||
#include <pango/pangocairo.h>
|
||||
|
||||
void fancy_cairo_stroke (cairo_t *cr);
|
||||
void fancy_cairo_stroke_preserve (cairo_t *cr);
|
||||
|
||||
/* A fancy cairo_stroke[_preserve]() that draws points and control
|
||||
* points, and connects them together.
|
||||
*/
|
||||
static void
|
||||
_fancy_cairo_stroke (cairo_t *cr, cairo_bool_t preserve)
|
||||
{
|
||||
int i;
|
||||
double line_width;
|
||||
cairo_path_t *path;
|
||||
cairo_path_data_t *data;
|
||||
const double dash[] = {10, 10};
|
||||
|
||||
cairo_save (cr);
|
||||
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
|
||||
|
||||
line_width = cairo_get_line_width (cr);
|
||||
path = cairo_copy_path (cr);
|
||||
cairo_new_path (cr);
|
||||
|
||||
cairo_save (cr);
|
||||
cairo_set_line_width (cr, line_width / 3);
|
||||
cairo_set_dash (cr, dash, G_N_ELEMENTS (dash), 0);
|
||||
for (i=0; i < path->num_data; i += path->data[i].header.length) {
|
||||
data = &path->data[i];
|
||||
switch (data->header.type) {
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
cairo_move_to (cr, data[1].point.x, data[1].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
cairo_line_to (cr, data[1].point.x, data[1].point.y);
|
||||
cairo_move_to (cr, data[2].point.x, data[2].point.y);
|
||||
cairo_line_to (cr, data[3].point.x, data[3].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
cairo_stroke (cr);
|
||||
cairo_restore (cr);
|
||||
|
||||
cairo_save (cr);
|
||||
cairo_set_line_width (cr, line_width * 4);
|
||||
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
|
||||
for (i=0; i < path->num_data; i += path->data[i].header.length) {
|
||||
data = &path->data[i];
|
||||
switch (data->header.type) {
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
cairo_move_to (cr, data[1].point.x, data[1].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
cairo_rel_line_to (cr, 0, 0);
|
||||
cairo_move_to (cr, data[1].point.x, data[1].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
cairo_rel_line_to (cr, 0, 0);
|
||||
cairo_move_to (cr, data[1].point.x, data[1].point.y);
|
||||
cairo_rel_line_to (cr, 0, 0);
|
||||
cairo_move_to (cr, data[2].point.x, data[2].point.y);
|
||||
cairo_rel_line_to (cr, 0, 0);
|
||||
cairo_move_to (cr, data[3].point.x, data[3].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
cairo_rel_line_to (cr, 0, 0);
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
cairo_rel_line_to (cr, 0, 0);
|
||||
cairo_stroke (cr);
|
||||
cairo_restore (cr);
|
||||
|
||||
for (i=0; i < path->num_data; i += path->data[i].header.length) {
|
||||
data = &path->data[i];
|
||||
switch (data->header.type) {
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
cairo_move_to (cr, data[1].point.x, data[1].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
cairo_line_to (cr, data[1].point.x, data[1].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
cairo_curve_to (cr, data[1].point.x, data[1].point.y,
|
||||
data[2].point.x, data[2].point.y,
|
||||
data[3].point.x, data[3].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
cairo_close_path (cr);
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
cairo_stroke (cr);
|
||||
|
||||
if (preserve)
|
||||
cairo_append_path (cr, path);
|
||||
|
||||
cairo_path_destroy (path);
|
||||
|
||||
cairo_restore (cr);
|
||||
}
|
||||
|
||||
/* A fancy cairo_stroke() that draws points and control points, and
|
||||
* connects them together.
|
||||
*/
|
||||
void
|
||||
fancy_cairo_stroke (cairo_t *cr)
|
||||
{
|
||||
_fancy_cairo_stroke (cr, FALSE);
|
||||
}
|
||||
|
||||
/* A fancy cairo_stroke_preserve() that draws points and control
|
||||
* points, and connects them together.
|
||||
*/
|
||||
void
|
||||
fancy_cairo_stroke_preserve (cairo_t *cr)
|
||||
{
|
||||
_fancy_cairo_stroke (cr, TRUE);
|
||||
}
|
||||
|
||||
|
||||
/* Returns Euclidean distance between two points */
|
||||
static double
|
||||
two_points_distance (cairo_path_data_t *a, cairo_path_data_t *b)
|
||||
{
|
||||
double dx, dy;
|
||||
|
||||
dx = b->point.x - a->point.x;
|
||||
dy = b->point.y - a->point.y;
|
||||
|
||||
return sqrt (dx * dx + dy * dy);
|
||||
}
|
||||
|
||||
/* Returns length of a Bezier curve.
|
||||
* Seems like computing that analytically is not easy. The
|
||||
* code just flattens the curve using cairo and adds the length
|
||||
* of segments.
|
||||
*/
|
||||
static double
|
||||
curve_length (double x0, double y0,
|
||||
double x1, double y1,
|
||||
double x2, double y2,
|
||||
double x3, double y3)
|
||||
{
|
||||
cairo_surface_t *surface;
|
||||
cairo_t *cr;
|
||||
cairo_path_t *path;
|
||||
cairo_path_data_t *data, current_point = {{0,},};
|
||||
int i;
|
||||
double length;
|
||||
|
||||
surface = cairo_image_surface_create (CAIRO_FORMAT_A8, 0, 0);
|
||||
cr = cairo_create (surface);
|
||||
cairo_surface_destroy (surface);
|
||||
|
||||
cairo_move_to (cr, x0, y0);
|
||||
cairo_curve_to (cr, x1, y1, x2, y2, x3, y3);
|
||||
|
||||
length = 0;
|
||||
path = cairo_copy_path_flat (cr);
|
||||
for (i=0; i < path->num_data; i += path->data[i].header.length) {
|
||||
data = &path->data[i];
|
||||
switch (data->header.type) {
|
||||
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
current_point = data[1];
|
||||
break;
|
||||
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
length += two_points_distance (¤t_point, &data[1]);
|
||||
current_point = data[1];
|
||||
break;
|
||||
|
||||
default:
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
cairo_path_destroy (path);
|
||||
|
||||
cairo_destroy (cr);
|
||||
|
||||
return length;
|
||||
}
|
||||
|
||||
|
||||
typedef double parametrization_t;
|
||||
|
||||
/* Compute parametrization info. That is, for each part of the
|
||||
* cairo path, tags it with its length.
|
||||
*
|
||||
* Free returned value with g_free().
|
||||
*/
|
||||
static parametrization_t *
|
||||
parametrize_path (cairo_path_t *path)
|
||||
{
|
||||
int i;
|
||||
cairo_path_data_t *data, last_move_to = {{0,},}, current_point = {{0,},};
|
||||
parametrization_t *parametrization;
|
||||
|
||||
parametrization = g_malloc (path->num_data * sizeof (parametrization[0]));
|
||||
|
||||
for (i=0; i < path->num_data; i += path->data[i].header.length) {
|
||||
data = &path->data[i];
|
||||
parametrization[i] = 0.0;
|
||||
switch (data->header.type) {
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
last_move_to = data[1];
|
||||
current_point = data[1];
|
||||
break;
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
/* Make it look like it's a line_to to last_move_to */
|
||||
data = (&last_move_to) - 1;
|
||||
G_GNUC_FALLTHROUGH;
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
parametrization[i] = two_points_distance (¤t_point, &data[1]);
|
||||
current_point = data[1];
|
||||
break;
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
/* naive curve-length, treating bezier as three line segments:
|
||||
parametrization[i] = two_points_distance (¤t_point, &data[1])
|
||||
+ two_points_distance (&data[1], &data[2])
|
||||
+ two_points_distance (&data[2], &data[3]);
|
||||
*/
|
||||
parametrization[i] = curve_length (current_point.point.x, current_point.point.y,
|
||||
data[1].point.x, data[1].point.y,
|
||||
data[2].point.x, data[2].point.y,
|
||||
data[3].point.x, data[3].point.y);
|
||||
|
||||
current_point = data[3];
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
|
||||
return parametrization;
|
||||
}
|
||||
|
||||
|
||||
typedef void (*transform_point_func_t) (void *closure, double *x, double *y);
|
||||
|
||||
/* Project a path using a function. Each point of the path (including
|
||||
* Bezier control points) is passed to the function for transformation.
|
||||
*/
|
||||
static void
|
||||
transform_path (cairo_path_t *path, transform_point_func_t f, void *closure)
|
||||
{
|
||||
int i;
|
||||
cairo_path_data_t *data;
|
||||
|
||||
for (i=0; i < path->num_data; i += path->data[i].header.length) {
|
||||
data = &path->data[i];
|
||||
switch (data->header.type) {
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
f (closure, &data[3].point.x, &data[3].point.y);
|
||||
f (closure, &data[2].point.x, &data[2].point.y);
|
||||
G_GNUC_FALLTHROUGH;
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
f (closure, &data[1].point.x, &data[1].point.y);
|
||||
break;
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* Simple struct to hold a path and its parametrization */
|
||||
typedef struct {
|
||||
cairo_path_t *path;
|
||||
parametrization_t *parametrization;
|
||||
} parametrized_path_t;
|
||||
|
||||
|
||||
/* Project a point X,Y onto a parameterized path. The final point is
|
||||
* where you get if you walk on the path forward from the beginning for X
|
||||
* units, then stop there and walk another Y units perpendicular to the
|
||||
* path at that point. In more detail:
|
||||
*
|
||||
* There's three pieces of math involved:
|
||||
*
|
||||
* - The parametric form of the Line equation
|
||||
* http://en.wikipedia.org/wiki/Line
|
||||
*
|
||||
* - The parametric form of the Cubic Bézier curve equation
|
||||
* http://en.wikipedia.org/wiki/B%C3%A9zier_curve
|
||||
*
|
||||
* - The Gradient (aka multi-dimensional derivative) of the above
|
||||
* http://en.wikipedia.org/wiki/Gradient
|
||||
*
|
||||
* The parametric forms are used to answer the question of "where will I be
|
||||
* if I walk a distance of X on this path". The Gradient is used to answer
|
||||
* the question of "where will I be if then I stop, rotate left for 90
|
||||
* degrees and walk straight for a distance of Y".
|
||||
*/
|
||||
static void
|
||||
point_on_path (parametrized_path_t *param,
|
||||
double *x, double *y)
|
||||
{
|
||||
int i;
|
||||
double ratio, the_y = *y, the_x = *x, dx, dy;
|
||||
cairo_path_data_t *data, last_move_to = {{0,},}, current_point = {{0,},};
|
||||
cairo_path_t *path = param->path;
|
||||
parametrization_t *parametrization = param->parametrization;
|
||||
|
||||
for (i=0; i + path->data[i].header.length < path->num_data &&
|
||||
(the_x > parametrization[i] ||
|
||||
path->data[i].header.type == CAIRO_PATH_MOVE_TO);
|
||||
i += path->data[i].header.length) {
|
||||
the_x -= parametrization[i];
|
||||
data = &path->data[i];
|
||||
switch (data->header.type) {
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
current_point = data[1];
|
||||
last_move_to = data[1];
|
||||
break;
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
current_point = data[1];
|
||||
break;
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
current_point = data[3];
|
||||
break;
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
data = &path->data[i];
|
||||
|
||||
switch (data->header.type) {
|
||||
|
||||
case CAIRO_PATH_MOVE_TO:
|
||||
break;
|
||||
case CAIRO_PATH_CLOSE_PATH:
|
||||
/* Make it look like it's a line_to to last_move_to */
|
||||
data = (&last_move_to) - 1;
|
||||
G_GNUC_FALLTHROUGH;
|
||||
case CAIRO_PATH_LINE_TO:
|
||||
{
|
||||
ratio = the_x / parametrization[i];
|
||||
/* Line polynomial */
|
||||
*x = current_point.point.x * (1 - ratio) + data[1].point.x * ratio;
|
||||
*y = current_point.point.y * (1 - ratio) + data[1].point.y * ratio;
|
||||
|
||||
/* Line gradient */
|
||||
dx = -(current_point.point.x - data[1].point.x);
|
||||
dy = -(current_point.point.y - data[1].point.y);
|
||||
|
||||
/*optimization for: ratio = the_y / sqrt (dx * dx + dy * dy);*/
|
||||
ratio = the_y / parametrization[i];
|
||||
*x += -dy * ratio;
|
||||
*y += dx * ratio;
|
||||
}
|
||||
break;
|
||||
case CAIRO_PATH_CURVE_TO:
|
||||
{
|
||||
/* FIXME the formulas here are not exactly what we want, because the
|
||||
* Bezier parametrization is not uniform. But I don't know how to do
|
||||
* better. The caller can do slightly better though, by flattening the
|
||||
* Bezier and avoiding this branch completely. That has its own cost
|
||||
* though, as large y values magnify the flattening error drastically.
|
||||
*/
|
||||
|
||||
double ratio_1_0, ratio_0_1;
|
||||
double ratio_2_0, ratio_0_2;
|
||||
double ratio_3_0, ratio_2_1, ratio_1_2, ratio_0_3;
|
||||
double _1__4ratio_1_0_3ratio_2_0, _2ratio_1_0_3ratio_2_0;
|
||||
|
||||
ratio = the_x / parametrization[i];
|
||||
|
||||
ratio_1_0 = ratio;
|
||||
ratio_0_1 = 1 - ratio;
|
||||
|
||||
ratio_2_0 = ratio_1_0 * ratio_1_0; /* ratio * ratio */
|
||||
ratio_0_2 = ratio_0_1 * ratio_0_1; /* (1 - ratio) * (1 - ratio) */
|
||||
|
||||
ratio_3_0 = ratio_2_0 * ratio_1_0; /* ratio * ratio * ratio */
|
||||
ratio_2_1 = ratio_2_0 * ratio_0_1; /* ratio * ratio * (1 - ratio) */
|
||||
ratio_1_2 = ratio_1_0 * ratio_0_2; /* ratio * (1 - ratio) * (1 - ratio) */
|
||||
ratio_0_3 = ratio_0_1 * ratio_0_2; /* (1 - ratio) * (1 - ratio) * (1 - ratio) */
|
||||
|
||||
_1__4ratio_1_0_3ratio_2_0 = 1 - 4 * ratio_1_0 + 3 * ratio_2_0;
|
||||
_2ratio_1_0_3ratio_2_0 = 2 * ratio_1_0 - 3 * ratio_2_0;
|
||||
|
||||
/* Bezier polynomial */
|
||||
*x = current_point.point.x * ratio_0_3
|
||||
+ 3 * data[1].point.x * ratio_1_2
|
||||
+ 3 * data[2].point.x * ratio_2_1
|
||||
+ data[3].point.x * ratio_3_0;
|
||||
*y = current_point.point.y * ratio_0_3
|
||||
+ 3 * data[1].point.y * ratio_1_2
|
||||
+ 3 * data[2].point.y * ratio_2_1
|
||||
+ data[3].point.y * ratio_3_0;
|
||||
|
||||
/* Bezier gradient */
|
||||
dx =-3 * current_point.point.x * ratio_0_2
|
||||
+ 3 * data[1].point.x * _1__4ratio_1_0_3ratio_2_0
|
||||
+ 3 * data[2].point.x * _2ratio_1_0_3ratio_2_0
|
||||
+ 3 * data[3].point.x * ratio_2_0;
|
||||
dy =-3 * current_point.point.y * ratio_0_2
|
||||
+ 3 * data[1].point.y * _1__4ratio_1_0_3ratio_2_0
|
||||
+ 3 * data[2].point.y * _2ratio_1_0_3ratio_2_0
|
||||
+ 3 * data[3].point.y * ratio_2_0;
|
||||
|
||||
ratio = the_y / sqrt (dx * dx + dy * dy);
|
||||
*x += -dy * ratio;
|
||||
*y += dx * ratio;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
}
|
||||
|
||||
/* Projects the current path of cr onto the provided path. */
|
||||
static void
|
||||
map_path_onto (cairo_t *cr, cairo_path_t *path)
|
||||
{
|
||||
cairo_path_t *current_path;
|
||||
parametrized_path_t param;
|
||||
|
||||
param.path = path;
|
||||
param.parametrization = parametrize_path (path);
|
||||
|
||||
current_path = cairo_copy_path (cr);
|
||||
cairo_new_path (cr);
|
||||
|
||||
transform_path (current_path,
|
||||
(transform_point_func_t) point_on_path, ¶m);
|
||||
|
||||
cairo_append_path (cr, current_path);
|
||||
|
||||
cairo_path_destroy (current_path);
|
||||
g_free (param.parametrization);
|
||||
}
|
||||
|
||||
|
||||
typedef void (*draw_path_func_t) (cairo_t *cr);
|
||||
|
||||
static void
|
||||
draw_text (cairo_t *cr,
|
||||
double x,
|
||||
double y,
|
||||
const char *font,
|
||||
const char *text)
|
||||
{
|
||||
PangoLayout *layout;
|
||||
PangoLayoutLine *line;
|
||||
PangoFontDescription *desc;
|
||||
cairo_font_options_t *font_options;
|
||||
|
||||
font_options = cairo_font_options_create ();
|
||||
|
||||
cairo_font_options_set_hint_style (font_options, CAIRO_HINT_STYLE_NONE);
|
||||
cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
|
||||
|
||||
cairo_set_font_options (cr, font_options);
|
||||
cairo_font_options_destroy (font_options);
|
||||
|
||||
layout = pango_cairo_create_layout (cr);
|
||||
|
||||
desc = pango_font_description_from_string (font);
|
||||
pango_layout_set_font_description (layout, desc);
|
||||
pango_font_description_free (desc);
|
||||
|
||||
pango_layout_set_text (layout, text, -1);
|
||||
|
||||
/* Use pango_layout_get_line() instead of pango_layout_get_line_readonly()
|
||||
* for older versions of pango
|
||||
*/
|
||||
line = pango_layout_get_line_readonly (layout, 0);
|
||||
|
||||
cairo_move_to (cr, x, y);
|
||||
pango_cairo_layout_line_path (cr, line);
|
||||
|
||||
g_object_unref (layout);
|
||||
}
|
||||
|
||||
static void
|
||||
draw_twisted (cairo_t *cr,
|
||||
double x,
|
||||
double y,
|
||||
const char *font,
|
||||
const char *text)
|
||||
{
|
||||
cairo_path_t *path;
|
||||
|
||||
cairo_save (cr);
|
||||
|
||||
/* Decrease tolerance a bit, since it's going to be magnified */
|
||||
cairo_set_tolerance (cr, 0.01);
|
||||
|
||||
/* Using cairo_copy_path() here shows our deficiency in handling
|
||||
* Bezier curves, specially around sharper curves.
|
||||
*
|
||||
* Using cairo_copy_path_flat() on the other hand, magnifies the
|
||||
* flattening error with large off-path values. We decreased
|
||||
* tolerance for that reason. Increase tolerance to see that
|
||||
* artifact.
|
||||
*/
|
||||
path = cairo_copy_path_flat (cr);
|
||||
/*path = cairo_copy_path (cr);*/
|
||||
|
||||
cairo_new_path (cr);
|
||||
|
||||
draw_text (cr, x, y, font, text);
|
||||
map_path_onto (cr, path);
|
||||
|
||||
cairo_path_destroy (path);
|
||||
|
||||
cairo_fill_preserve (cr);
|
||||
|
||||
cairo_save (cr);
|
||||
cairo_set_source_rgb (cr, 0.1, 0.1, 0.1);
|
||||
cairo_stroke (cr);
|
||||
cairo_restore (cr);
|
||||
|
||||
cairo_restore (cr);
|
||||
}
|
||||
|
||||
static void
|
||||
draw_dream (cairo_t *cr)
|
||||
{
|
||||
cairo_move_to (cr, 50, 650);
|
||||
|
||||
cairo_rel_line_to (cr, 250, 50);
|
||||
cairo_rel_curve_to (cr, 250, 50, 600, -50, 600, -250);
|
||||
cairo_rel_curve_to (cr, 0, -400, -300, -100, -800, -300);
|
||||
|
||||
cairo_set_line_width (cr, 1.5);
|
||||
cairo_set_source_rgba (cr, 0.3, 0.3, 1.0, 0.3);
|
||||
|
||||
fancy_cairo_stroke_preserve (cr);
|
||||
|
||||
draw_twisted (cr,
|
||||
0, 0,
|
||||
"Serif 72",
|
||||
"It was a dream... Oh Just a dream...");
|
||||
}
|
||||
|
||||
static void
|
||||
draw_wow (cairo_t *cr)
|
||||
{
|
||||
cairo_move_to (cr, 400, 780);
|
||||
|
||||
cairo_rel_curve_to (cr, 50, -50, 150, -50, 200, 0);
|
||||
|
||||
cairo_scale (cr, 1.0, 2.0);
|
||||
cairo_set_line_width (cr, 2.0);
|
||||
cairo_set_source_rgba (cr, 0.3, 1.0, 0.3, 1.0);
|
||||
|
||||
fancy_cairo_stroke_preserve (cr);
|
||||
|
||||
draw_twisted (cr,
|
||||
-20, -150,
|
||||
"Serif 60",
|
||||
"WOW!");
|
||||
}
|
||||
|
||||
int main (int argc, char **argv)
|
||||
{
|
||||
cairo_t *cr;
|
||||
char *filename;
|
||||
cairo_status_t status;
|
||||
cairo_surface_t *surface;
|
||||
|
||||
if (argc != 2)
|
||||
{
|
||||
g_printerr ("Usage: cairotwisted OUTPUT_FILENAME\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
filename = argv[1];
|
||||
|
||||
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
|
||||
1000, 800);
|
||||
cr = cairo_create (surface);
|
||||
|
||||
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
|
||||
cairo_paint (cr);
|
||||
|
||||
draw_dream (cr);
|
||||
draw_wow (cr);
|
||||
|
||||
cairo_destroy (cr);
|
||||
|
||||
status = cairo_surface_write_to_png (surface, filename);
|
||||
cairo_surface_destroy (surface);
|
||||
|
||||
if (status != CAIRO_STATUS_SUCCESS)
|
||||
{
|
||||
g_printerr ("Could not save png to '%s'\n", filename);
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,30 @@
|
||||
examples = []
|
||||
|
||||
if pango_cairo_backends.contains('png')
|
||||
examples += [
|
||||
'cairoshape',
|
||||
'cairosimple',
|
||||
'cairotwisted',
|
||||
]
|
||||
endif
|
||||
|
||||
examples_deps = [ libpango_dep, libpangocairo_dep, ]
|
||||
|
||||
if pango_font_backends.contains('freetype')
|
||||
examples_deps += libpangoft2_dep
|
||||
endif
|
||||
|
||||
# somebody will have to fix this
|
||||
# if host_system == 'windows'
|
||||
# # This hasn't been built in years, most likely, but try now
|
||||
# examples += [ 'pangowin32tobmp' ]
|
||||
# examples_deps += [ libpangowin32_dep ]
|
||||
# endif
|
||||
|
||||
foreach e: examples
|
||||
executable(e, '@0@.c'.format(e),
|
||||
dependencies: examples_deps + pango_deps,
|
||||
c_args: common_cflags,
|
||||
include_directories: root_inc,
|
||||
install: false)
|
||||
endforeach
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user