png_get_pixels_per_meter 2047 3rdparty/libpng/png.h PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, png_get_pixels_per_meter 312 3rdparty/libpng/pngget.c return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));