png_get_pixels_per_meter 2300 third_party/libpng/png.h extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
png_get_pixels_per_meter  298 third_party/libpng/pngget.c    return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)