In Android Use libView.so, why not have cpp Code?

[Mingyue 郭]

In Skia folder:

https://github.com/google/skia/tree/fcee51038aeaf3596a4ffcdba0bf18e3155e09b9/platform_tools/android/apps/viewer

It is a simple Example in Android use skia lib ? 

In java code I found native function,  But  I can not found the function definition (C++)？ 

Where is it ? Or How I should use it?

In the old skia, There is a helloWorld Example In skia\platform_tools\android\examples\hello_skia_app; I build it and use new skia lib(libskia.so), when run, 

throw out dlopen failed!

[Jim Van Verth]

The C++ code for the Viewer is in tools/viewer, and I believe the remaining C++ code for the Android interface is in tools/viewer/sk_app/android. Instructions for building the Viewer can be found at https://skia.org/user/sample/viewer.

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[Mingyue 郭]

thinks. It looked complicated for me. 

And:

I use libskia.a, it is ok. 

But  the file libskia.a size is a big(57.7MB).

在 2017年4月18日星期二 UTC+8下午9:49:44，Jim Van Verth写道：

[Jim Van Verth]

I'm not sure if there's a build setting with GN, but you can use 'strip' (https://linux.die.net/man/1/strip) to remove the extra symbols from libskia.a. That should reduce the size considerably.

[Mike Klein]

If you're worried about build size, the best first thing to do is make sure you have set is_official_build=true in GN.  You can learn more by reading the first section of https://skia.org/user/build.

[Mingyue 郭]

I had do it,But I do not konw Why they cannot found many header  file  like this:

mingyue@ubuntu:~/git/skia$ bin/gn gen out/arm-4    --args='ndk="/home/mingyue/android-ndk-r14b" target_cpu="arm" is_official_build=true'

Done. Made 36 targets from 25 files in 32ms

mingyue@ubuntu:~/git/skia$ ninja -C out/arm-4

ninja: Entering directory `out/arm-4'

[85/806] compile ../../src/ports/SkFontMgr_android_parser.cpp

FAILED: /home/mingyue/android-ndk-r14b/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -MMD -MF obj/src/ports/fontmgr_android.SkFontMgr_android_parser.o.d -DNDEBUG -DSK_GAMMA_APPLY_TO_A8 -DSK_INTERNAL -DSK_GAMMA_EXPONENT=1.4 -DSK_GAMMA_CONTRAST=0.0 -DSK_ALLOW_STATIC_GLOBAL_INITIALIZERS=0 -DSK_ENABLE_DISCRETE_GPU -DSKIA_IMPLEMENTATION=1 -I../../include/android -I../../include/c -I../../include/codec -I../../include/config -I../../include/core -I../../include/effects -I../../include/gpu -I../../include/gpu/gl -I../../include/pathops -I../../include/ports -I../../include/svg -I../../include/utils -I../../include/utils/mac -I/include -I../../include/private -I../../src/c -I../../src/codec -I../../src/core -I../../src/effects -I../../src/effects/gradients -I../../src/fonts -I../../src/image -I../../src/images -I../../src/lazy -I../../src/opts -I../../src/pathops -I../../src/pdf -I../../src/ports -I../../src/sfnt -I../../src/sksl -I../../src/utils -I../../src/utils/win -I../../src/xml -I../../third_party/etc1 -I../../third_party/gif -I../../src/gpu -fstrict-aliasing -fPIC -Werror -march=armv7-a -mfpu=neon -mthumb --sysroot=/home/mingyue/android-ndk-r14b/platforms/android-18/arch-arm --target=arm-linux-androideabi -B/home/mingyue/android-ndk-r14b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/arm-linux-androideabi/bin -Wall -Wextra -Winit-self -Wpointer-arith -Wsign-compare -Wvla -Wno-deprecated-declarations -Wno-maybe-uninitialized -Weverything -Wno-unknown-warning-option -Wno-cast-align -Wno-conditional-uninitialized -Wno-conversion -Wno-disabled-macro-expansion -Wno-documentation -Wno-documentation-unknown-command -Wno-double-promotion -Wno-exit-time-destructors -Wno-float-conversion -Wno-float-equal -Wno-format-nonliteral -Wno-global-constructors -Wno-gnu-zero-variadic-macro-arguments -Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-pedantic -Wno-reserved-id-macro -Wno-shadow -Wno-shift-sign-overflow -Wno-sign-conversion -Wno-signed-enum-bitfield -Wno-switch-enum -Wno-undef -Wno-unreachable-code -Wno-unreachable-code-break -Wno-unreachable-code-return -Wno-unused-macros -Wno-unused-member-function -Wno-covered-switch-default -Wno-deprecated -Wno-implicit-fallthrough -Wno-missing-noreturn -Wno-old-style-cast -Wno-padded -Wno-unused-parameter -O3 -fdata-sections -ffunction-sections -std=c++11 -isystem/home/mingyue/android-ndk-r14b/sources/android/support/include -isystem/home/mingyue/android-ndk-r14b/sources/cxx-stl/gnu-libstdc++/4.9/include -isystem/home/mingyue/android-ndk-r14b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include -fno-exceptions -fno-rtti -Wnon-virtual-dtor -Wno-abstract-vbase-init -Wno-weak-vtables -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-undefined-func-template -c ../../src/ports/SkFontMgr_android_parser.cpp -o obj/src/ports/fontmgr_android.SkFontMgr_android_parser.o

../../src/ports/SkFontMgr_android_parser.cpp:21:10: fatal error: 'expat.h' file not found

#include <expat.h>

         ^

1 error generated.

[85/806] compile ../../src/ports/SkGlobalInitialization_default.cpp

ninja: build stopped: subcommand failed.

I can found the expat.h in third_party/externals folder ,so I change the SkGlobalInitialization_default.cpp the include "../../third_party/externals/expat/lib/expat.h", The error can be solved。

But then continue, there have :

[346/806] compile ../../src/codec/SkPngCodec.cpp

FAILED: /home/mingyue/android-ndk-r14b/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -MMD -MF obj/src/codec/png.SkPngCodec.o.d -DNDEBUG -DSK_GAMMA_APPLY_TO_A8 -DSK_INTERNAL -DSK_GAMMA_EXPONENT=1.4 -DSK_GAMMA_CONTRAST=0.0 -DSK_ALLOW_STATIC_GLOBAL_INITIALIZERS=0 -DSK_ENABLE_DISCRETE_GPU -DSKIA_IMPLEMENTATION=1 -DSK_HAS_PNG_LIBRARY -I../../include/android -I../../include/c -I../../include/codec -I../../include/config -I../../include/core -I../../include/effects -I../../include/gpu -I../../include/gpu/gl -I../../include/pathops -I../../include/ports -I../../include/svg -I../../include/utils -I../../include/utils/mac -I/include -I../../include/private -I../../src/c -I../../src/codec -I../../src/core -I../../src/effects -I../../src/effects/gradients -I../../src/fonts -I../../src/image -I../../src/images -I../../src/lazy -I../../src/opts -I../../src/pathops -I../../src/pdf -I../../src/ports -I../../src/sfnt -I../../src/sksl -I../../src/utils -I../../src/utils/win -I../../src/xml -I../../third_party/etc1 -I../../third_party/gif -I../../src/gpu -fstrict-aliasing -fPIC -Werror -march=armv7-a -mfpu=neon -mthumb --sysroot=/home/mingyue/android-ndk-r14b/platforms/android-18/arch-arm --target=arm-linux-androideabi -B/home/mingyue/android-ndk-r14b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/arm-linux-androideabi/bin -Wall -Wextra -Winit-self -Wpointer-arith -Wsign-compare -Wvla -Wno-deprecated-declarations -Wno-maybe-uninitialized -Weverything -Wno-unknown-warning-option -Wno-cast-align -Wno-conditional-uninitialized -Wno-conversion -Wno-disabled-macro-expansion -Wno-documentation -Wno-documentation-unknown-command -Wno-double-promotion -Wno-exit-time-destructors -Wno-float-conversion -Wno-float-equal -Wno-format-nonliteral -Wno-global-constructors -Wno-gnu-zero-variadic-macro-arguments -Wno-missing-prototypes -Wno-missing-variable-declarations -Wno-pedantic -Wno-reserved-id-macro -Wno-shadow -Wno-shift-sign-overflow -Wno-sign-conversion -Wno-signed-enum-bitfield -Wno-switch-enum -Wno-undef -Wno-unreachable-code -Wno-unreachable-code-break -Wno-unreachable-code-return -Wno-unused-macros -Wno-unused-member-function -Wno-covered-switch-default -Wno-deprecated -Wno-implicit-fallthrough -Wno-missing-noreturn -Wno-old-style-cast -Wno-padded -Wno-unused-parameter -O3 -fdata-sections -ffunction-sections -std=c++11 -isystem/home/mingyue/android-ndk-r14b/sources/android/support/include -isystem/home/mingyue/android-ndk-r14b/sources/cxx-stl/gnu-libstdc++/4.9/include -isystem/home/mingyue/android-ndk-r14b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include -fno-exceptions -fno-rtti -Wnon-virtual-dtor -Wno-abstract-vbase-init -Wno-weak-vtables -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-undefined-func-template -c ../../src/codec/SkPngCodec.cpp -o obj/src/codec/png.SkPngCodec.o

../../src/codec/SkPngCodec.cpp:24:10: fatal error: 'png.h' file not found

#include "png.h"

It seems that the header file can not be referenced correctly.I do not want to change the include one by one beacuse there have Hundreds of files.

I alse set  like this:export C_INCLUDE_PATH="/home/mingyue/git/skia/third_party/externals:$C_INCLUDE_PATH",bout it can not working.

在 2017年4月19日星期三 UTC+8下午9:07:08，Mike Klein写道：

[Mike Klein]

This is intentional... when you set is_official_build=true, you are disabling the versions of several test libraries we build from source in the default is_official_build=false build mode.

You need to decide whether you want to build Skia with support for these libraries, and how you want to provide it.  If you don't want them, you'll need to turn them off using skia_use_<something>=false where <something> is the name of the library to disable.

The default with is_official_build=true is that we'll try to build and link against the libraries found on ordinary system include and library paths (like /usr/include, /usr/lib).  You can use extra_cflags and extra_ldflags to point your compiler at the libraries you want (using -Isomething and -Lsomething).  I'm not familiar with C_INCLUDE_PATH, but if your compiler supports that it should work fine.

Alternatively, if you really want to use the versions of these libraries that we do not at all support and just happened to check out for our convenience in testing, you can set skia_use_system_<something>=false to go back to building that library from source.

[Mingyue 郭]

It explains the matter. Thinks.

在 2017年4月20日星期四 UTC+8上午11:42:29，Mike Klein写道：

[Volodymyr B]

thank you Mike!

please consider add this info to skia build instruction.

[Mike Klein]

I think this already there, the very first section on skia.org/user/build... is that missing anything?