png_create_write_struct 1593 third_party/libpng/png.h extern PNG_EXPORT(png_structp,png_create_write_struct)
png_create_write_struct  580 tools/imagediff/image_diff_png.cc   png_struct* png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
png_create_write_struct  715 ui/gfx/codec/png_codec.cc   png_struct* png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
png_create_write_struct  194 ui/gfx/codec/png_codec_unittest.cc       png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);