ppi_from_ppm 312 3rdparty/libpng/pngget.c return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr)); ppi_from_ppm 318 3rdparty/libpng/pngget.c return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr)); ppi_from_ppm 324 3rdparty/libpng/pngget.c return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));