在MinGW64下编译obs-text-pango

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obs-text-pango 是什么

首先介绍下OBS是什么，OBS - Free and open source software for live streaming and screen recording(OBS是一款开源的用于录屏直播的工具软件)。旧版的OBS只能支持Windows，目前已经停止开发。作者为了支持Windows/Mac/Linux重写了整个软件，项目地址为obs-studio in Github。

OBS项目的语言分布：

  1. C: 57.6%
  2. C++: 36.3%
  3. Objective-C/Objective-C++: 4%
  4. others: 3%

OBS代码主要包含这些部分：

  1. libobs: 核心代码，定义项目框架以及核心API，主要用C语言编写。
  2. UI: 界面代码，采用C++的QT框架，开发出适用三大平台的界面。
  3. plugins: 插件代码，可独立编译成dll(windows平台)或so(*nix平台)，包含Source(录屏输入源)、Output、Service(各种流播服务)等全部被定义为插件。
  4. libobs-d3d11: 基于D3D的图形子系统，主要用在Windows系统。
  5. libobs-opengl: 基于opengl的图形子系统，主要用在*uix系统。

obs-text-pango是obs的一个文本插件plugins，它与obs本身提供的obs-text插件不同之处在于，它支持emoji，且用pango排版引擎实现，项目地址为obs-studio in Github，forked from reboot/obs-text-pango, 这个项目源码需要改进，编译出来是无法使用

如何编译

  1. 使用MSys2的pacman工具安装以下库
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pacman -S mingw-w64-x86_64-pkg-config
pacman -S mingw-w64-x86_64-gcc
pacman -S mingw64/mingw-w64-x86_64-cmake
pacman -S mingw64/mingw-w64-x86_64-make //cp mingw32-make.exe make.exe
pacman -S mingw-w64-x86_64-qt5
pacman -S mingw-w64-x86_64-ffmpeg
pacman -S mingw-w64-x86_64-vlc
pacman -S mingw-w64-x86_64-fdk-aac
  1. 下载obs-text-pango源码
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git clone https://github.com/kkartaltepe/obs-text-pango.git
  1. 修改CMakeList.txt
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cmake_minimum_required(VERSION 2.8.12)

project(text-pango)

# Standalone build
if(NOT OBS_OUTPUT_DIR)
	#SET(CMAKE_FIND_LIBRARY_PREFIXES "lib" "")
	#SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a" ".dll.a" ".lib" ".dll")
	
	set(CMAKE_INSTALL_PREFIX "D:/_workdir/obs/obs-studio/vs2015/rundir/Debug")
	list(APPEND CMAKE_INCLUDE_PATH "D:/_workdir/obs/obs-studio/libobs")
	list(APPEND CMAKE_LIBRARY_PATH "D:/_workdir/obs/obs-studio/vs2015/libobs/Debug")
	
	set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/")
	include(ObsHelpers)

	set(CMAKE_C_STANDARD 11)
	set(STANDALONE_PLUGIN TRUE)
	
	find_path(OBS_INCLUDE_DIRS
        obs-module.h)
    find_library(OBS_LIBRARIES
        NAMES libobs obs)
# Build as submodule of obs-studio
else()
	set(OBS_INCLUDE_DIRS
		../../libobs)
	set(OBS_LIBRARIES
		libobs)
endif()

find_package(Pango REQUIRED)
find_package(Cairo REQUIRED)
find_package(Pangocairo REQUIRED)
find_package(Pangoft2 REQUIRED)
#if(WIN32)
#	find_package(Pangowin32 REQUIRED)
#endif()
set(PANGOWIN32_LIBRARIES
	"C:/msys64/mingw64/lib/libpangowin32-1.0.a")
find_package(Fontconfig REQUIRED)
find_package(Freetype REQUIRED)

include_directories(
	${OBS_INCLUDE_DIRS}
	${PANGO_INCLUDE_DIRS}
	${CAIRO_INCLUDE_DIRS}
	${PANGOCAIRO_INCLUDE_DIRS}
	${PANGOFT2_INCLUDE_DIRS}
	${FREETYPE_INCLUDE_DIRS})
if(NOT WIN32)
	FIND_PACKAGE(PkgConfig)
	PKG_CHECK_MODULES(GLIB glib-2.0 REQUIRED)
	include_directories(${GLIB_INCLUDE_DIRS})
endif()

link_directories(
	${PANGO_LIBRARY_DIRS}
	${CAIRO_LIBRARY_DIRS}
	${FREETYPE_LIBRARY_DIRS})

set(text-pango_SOURCES
	text-pango.c
	text-pango.h
	text-utilities.h)

set(win32_static_LIBRARIES
	intl
	fribidi
	pixman-1
	z
	harfbuzz
	libpng16
	expat
	usp10)
if(WIN32)
	set(PLATFORM_LIBRARIES ${win32_static_LIBRARIES})
endif()

add_library(text-pango MODULE
	${text-pango_SOURCES})
target_link_libraries(text-pango
	${OBS_LIBRARIES}
	${CAIRO_LIBRARIES}
	${PANGO_LIBRARIES}
	${PANGOWIN32_LIBRARIES}
	${PANGOCAIRO_LIBRARIES}
	${PANGOFT2_LIBRARIES}
	${FREETYPE_LIBRARIES}
	${FONTCONFIG_LIBRARIES}
	${PLATFORM_LIBRARIES}) # win only currently
target_compile_definitions(text-pango PRIVATE ${CAIRO_C_FLAGS})


if(STANDALONE_PLUGIN)
	if(CMAKE_SIZEOF_VOID_P EQUAL 8)
		set(_bit_suffix "64bit/")
	else()
		set(_bit_suffix "32bit/")
	endif()
	if(APPLE)
		install(TARGETS text-pango
			LIBRARY DESTINATION "Library/Application Support/obs-studio/plugins/libtext-pango/bin/")
		install(DIRECTORY data/common/
			DESTINATION "Library/Application Support/obs-studio/plugins/libtext-pango/data")
		install(DIRECTORY data/apple/
			DESTINATION "Library/Application Support/obs-studio/plugins/libtext-pango/data")
		# for packaging, copy all dependencies, change dependency links
		# run pkgbuild --identifier user.obsproject.kurufu.text-pango --root ./obs-text-pango-install/ text-pango-mac.pkg
	else() # Not apple so normal layout
		install(TARGETS text-pango 
			LIBRARY DESTINATION "obs-plugins/${_bit_suffix}/")
		install(DIRECTORY data/common/
			DESTINATION data/obs-plugins/text-pango)
		# Platform specific data, like fontconfig in win32
		if(WIN32)
			#install(FILES $<TARGET_PDB_FILE:${PROJECT_NAME}>
			#	DESTINATION "obs-plugins/${_bit_suffix}/" OPTIONAL)
			install(DIRECTORY data/win32/
				DESTINATION data/obs-plugins/text-pango)
		endif()
	endif()
else()
	install_obs_plugin_with_data(text-pango data/common)
	# calling this twice might not work?
	if(WIN32)
		install_obs_plugin_with_data(text-pango data/win32)
	endif()
	if(APPLE)
		install_obs_plugin_with_data(text-pango data/apple)
	endif()
endif()
  1. 使用window的cmd工具，以x64位的姿态打开，进入obs-text-pango目录，并输入以下命令
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mkdir mingw64
cd mingw64
cmake .. -G "MinGW Makefiles"
make
make install

过程中遇到的问题

  1. 命令行使用msys2_shell.cmd，或者git-bash.exe，会遇到一个sh冲突的问题，所以只能用windows的cmd

  2. cmake的时候使用-G “Visual Studio 14 2015 Win64”，项目能够编译过，且lib也能相互兼容，至少是c的lib，但链接的时候会有各种各样的问题，未深入去研究

  3. cmake的时候使用-G “MSYS Makefiles”，也是各种问题，可能我安装的都是mingw64的库的原因吧

  4. cmake的时候，想尽量静态编译，所以在CMakeLists.txt中加入以下语句，但在链接的时候提示各种各样奇怪问题，所以最后还是去掉

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SET(CMAKE_FIND_LIBRARY_PREFIXES "lib" "")
SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a" ".dll.a" ".lib" ".dll")
  1. 纹理大小为0的时候，会导致程序崩溃，可能是obs新旧版本兼容问题