png_set_mem_fn    618 third_party/libpng/pngmem.c png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
png_set_mem_fn    398 third_party/libpng/pngusr.h #define png_set_mem_fn                  wk_png_set_mem_fn