Android Image Decompress/Compress And Convert/Transform

A library built with the CMake is used for image file decompress/compress or conversion on the Android platform.

WHY

• fix Bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream) ; Use libjpeg-turbo for YUV->RGB conversion in jpeg encoder
• easy customization
• compile common libraries for android.

Feature

• zlib v1.2.11
• libjpeg-turbo v2.1.2
• libpng v1.6.37
• libwebp v1.2.2
• support libjpeg-turbo built by cmake on Android platform.
• support jpeg compress.
• support heif v3.7.0

Building

• build zlib v1.2.11, all ndk versions contains zlib that v1.2.3, it will cause many image libs which use zlib failed.

Requirements

• Android NDK r22
• Android SDK
• Android SDK Build tools 31.x
• CMake 3.10.2

you can change the ndk version by build.gradle#ndkVersion

Build Problems

• "libclang_rt.asan-arm-android.so" not found. CauseBy: -fsanitize=address, if midSdk < 21, remove the cflags or upgrade minSdk at least 21.

• libpng with zlib build failed.

#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
#  error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
      "-I (include path) error: see the notes in pngpriv.h"

check zlib.h and pngpriv.h ZLIB_VERNUM == PNG_ZLIB_VERNUM

Roadmap

• add libjpeg built
• add libpng built
• add libwebp built
• add heif built