A Project To Study how to parse png with libpng api and build app with NDK.
is an open source project to develop and maintain the reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files.
- Official Document: http://png-mng.sourceforge.net/pub/png/libpng.html
- Android itself support varies media format decode/encode, so this project is useless but for study libpng.
- libpng depends on zlib, I just use the ndk provided zlib instead of the source code.
- libpng for ARM support RTTI, just add APP_CPPFLAGS := -frtti to enable it.
- Simplied API for libpng is easy to use:
macros:
PNG_FORMAT_*
PNG_IMAGE_*
structures:
png_control
png_image
read functions
png_image_begin_read_from_file()
png_image_begin_read_from_stdio()
png_image_begin_read_from_memory()
png_image_finish_read()
png_image_free()
write functions
png_image_write_to_file()
png_image_write_to_memory()
png_image_write_to_stdio()- I just need two functions to read png from memory:
png_image_begin_read_from_memory();
png_image_finish_read();- Libpng support different kinds of color format(PNG_FORMAT_BGRA just fit android Bitmap.Config.ARGB_8888 int buffer model):
#define PNG_FORMAT_GRAY 0
#define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA
#define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST)
#define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR
#define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR)
#define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA)
#define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST)
#define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA)
#define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST)- GitHub: https://huzongyao.github.io/
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