尝试构建 Skia 时缺少头文件

Question

我正在尝试在 Windows 上使用Skia图形库，这需要从源代码构建它。但是，当我运行构建命令时：

ninja -C out/Static

我收到此构建错误：

"C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC/Tools/MSVC/14.23.28105/bin/HostX64/x64/cl.exe" /nologo /showIncludes /FC -D_CRT_SECURE_NO_WARNINGS -D_HAS_EXCEPTIONS=0 -DWIN32_LEAN_AND_MEAN -DNOMINMAX -DNDEBUG -DSK_GAMMA_APPLY_TO_A8 -DSKIA_IMPLEMENTATION=1 -DSK_HAS_PNG_LIBRARY "-IC:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.23.28105/include" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/shared" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/ucrt" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/um" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/winrt" -I../.. /bigobj /utf-8 /O2 /Zc:inline  /GR- /c ../../src/codec/SkPngCodec.cpp /Foobj/src/codec/png.SkPngCodec.obj /Fd"obj/png_c.pdb"
path\to\skia\src\codec\SkPngCodec.cpp(25): fatal error C1083: Cannot open include file: 'png.h': No such file or directory

我尝试再次运行它，现在出现了不同的错误：

"C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC/Tools/MSVC/14.23.28105/bin/HostX64/x64/cl.exe" /nologo /showIncludes /FC -DSK_PDF_USE_SFNTLY -D_CRT_SECURE_NO_WARNINGS -D_HAS_EXCEPTIONS=0 -DWIN32_LEAN_AND_MEAN -DNOMINMAX -DNDEBUG -DSK_GAMMA_APPLY_TO_A8 -DSKIA_IMPLEMENTATION=1 -DSK_SUPPORT_PDF -DSK_HAS_JPEG_LIBRARY -DU_USING_ICU_NAMESPACE=0 "-IC:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.23.28105/include" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/shared" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/ucrt" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/um" "-IC:/Program Files (x86)/Windows Kits/10/Include/10.0.18362.0/winrt" -I../.. -I../../third_party/externals/sfntly/cpp/src /bigobj /utf-8 /O2 /Zc:inline  /GR- /c ../../src/pdf/SkDeflate.cpp /Foobj/src/pdf/pdf.SkDeflate.obj /Fd"obj/pdf_c.pdb"
C:\Users\natan\Desktop\skia\src\pdf\SkDeflate.cpp(16): fatal error C1083: Cannot open include file: 'zlib.h': No such file or directory

我如何获取所有这些丢失的文件？

Answer 1

几年过去了，也许情况发生了变化，官方文档也有不同的做法。
首先，您应该运行python tools/git-sync-deps以下载所有依赖项。
然后，如果编译时发现还有头文件找不到，就加上该skia_use_system_xxx=false参数。
这是我在 Windows 上使用的命令：

bin/gn gen out/Static --args='is_official_build=true skia_use_system_libjpeg_turbo=false skia_use_system_zlib=false skia_use_system_harfbuzz=false skia_use_system_libpng=false skia_use_system_libwebp=false skia_use_system_expat=false skia_use_system_icu=false'
ninja -C out/Static

这样，你仍然可以编译所有依赖项。唯一的变化是依赖项是从您刚刚下载的位置获取的，而不是系统路径。