png_set_compression_level 2007 third_party/libpng/png.h extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
png_set_compression_level  484 tools/imagediff/image_diff_png.cc   png_set_compression_level(png_ptr, compression_level);
png_set_compression_level  594 ui/gfx/codec/png_codec.cc   png_set_compression_level(png_ptr, compression_level);