PNG_FILTER_TYPE_BASE 1024 extra_lib/include/png/png.h #define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
PNG_FILTER_TYPE_BASE  595 src/media_tools/img.c 	png_set_IHDR(png_ptr, info_ptr, width, height, 8, type, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);