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src/Source/LibPNG/pngget.c  view on Meta::CPAN

      png_debug1(1, "in %s retrieval function", "pHYs");

      if (res_x != NULL)
      {
         *res_x = info_ptr->x_pixels_per_unit;
         retval |= PNG_INFO_pHYs;
      }

      if (res_y != NULL)
      {
         *res_y = info_ptr->y_pixels_per_unit;
         retval |= PNG_INFO_pHYs;
      }

      if (unit_type != NULL)
      {
         *unit_type = (int)info_ptr->phys_unit_type;
         retval |= PNG_INFO_pHYs;

         if (*unit_type == 1)
         {
            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
         }
      }
   }

   return (retval);
}
#endif /* pHYs */
#endif  /* INCH_CONVERSIONS */

/* png_get_channels really belongs in here, too, but it's been around longer */

#endif  /* EASY_ACCESS */


png_byte PNGAPI
png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->channels);

   return (0);
}

#ifdef PNG_READ_SUPPORTED
png_const_bytep PNGAPI
png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->signature);

   return (NULL);
}
#endif

#ifdef PNG_bKGD_SUPPORTED
png_uint_32 PNGAPI
png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
   png_color_16p *background)
{
   if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->valid & PNG_INFO_bKGD) != 0 &&
       background != NULL)
   {
      png_debug1(1, "in %s retrieval function", "bKGD");

      *background = &(info_ptr->background);
      return (PNG_INFO_bKGD);
   }

   return (0);
}
#endif

#ifdef PNG_cHRM_SUPPORTED
/* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
 * same time to correct the rgb grayscale coefficient defaults obtained from the
 * cHRM chunk in 1.5.4
 */
#  ifdef PNG_FLOATING_POINT_SUPPORTED
png_uint_32 PNGAPI
png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
    double *white_x, double *white_y, double *red_x, double *red_y,
    double *green_x, double *green_y, double *blue_x, double *blue_y)
{
   /* Quiet API change: this code used to only return the end points if a cHRM
    * chunk was present, but the end points can also come from iCCP or sRGB
    * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
    * the png_set_ APIs merely check that set end points are mutually
    * consistent.
    */
   if (png_ptr != NULL && info_ptr != NULL &&
      (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
   {
      png_debug1(1, "in %s retrieval function", "cHRM");

      if (white_x != NULL)
         *white_x = png_float(png_ptr,
            info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
      if (white_y != NULL)
         *white_y = png_float(png_ptr,
            info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
      if (red_x != NULL)
         *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
            "cHRM red X");
      if (red_y != NULL)
         *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
            "cHRM red Y");
      if (green_x != NULL)
         *green_x = png_float(png_ptr,
            info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
      if (green_y != NULL)
         *green_y = png_float(png_ptr,
            info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
      if (blue_x != NULL)
         *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
            "cHRM blue X");
      if (blue_y != NULL)
         *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
            "cHRM blue Y");
      return (PNG_INFO_cHRM);
   }

   return (0);
}

png_uint_32 PNGAPI