png_get_pHYs
Name
png_get_pHYs -- get the physical resolution for given image
Synopsis
png_uint_32
png_get_pHYs(png_structp
png_ptr, png_infop
info_ptr, png_uint_32 *
res_x, png_uint_32 *
res_y, int *
unit_type);
Description
png_get_pHYs() shall return the physical pixel resolution of the image and the
unit of resolution. Upon success, *res_x shall contain the horizontal resolution
and *res_y shall contain the vertical resolution in pixels per unit. *unit_type
will be set to PNG_RESOLUTION_METER if the resolution is expressed in pixels per
meter. Otherwise *unit_type will be PNG_RESOLUTION_UNKNOWN.
Return Value
PNG_INFO_pHYs - on success
0 - otherwise.
