/* pngget.c - retrieval of values from info struct

 *

 * Last changed in libpng 1.2.30 [August 15, 2008]

 * For conditions of distribution and use, see copyright notice in png.h

 * Copyright (c) 1998-2008 Glenn Randers-Pehrson

 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

 */

#define PNG_INTERNAL

#include "png.h"

#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

png_uint_32 PNGAPI

png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)

{

   if (png_ptr != NULL && info_ptr != NULL)

      return(info_ptr->valid & flag);

   else

      return(0);

}

png_uint_32 PNGAPI

png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

      return(info_ptr->rowbytes);

   else

      return(0);

}

#if defined(PNG_INFO_IMAGE_SUPPORTED)

png_bytepp PNGAPI

png_get_rows(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

      return(info_ptr->row_pointers);

   else

      return(0);

}

#endif

#ifdef PNG_EASY_ACCESS_SUPPORTED

/* easy access to info, added in libpng-0.99 */

png_uint_32 PNGAPI

png_get_image_width(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

   {

      return info_ptr->width;

   }

   return (0);

}

png_uint_32 PNGAPI

png_get_image_height(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

   {

      return info_ptr->height;

   }

   return (0);

}

png_byte PNGAPI

png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

   {

      return info_ptr->bit_depth;

   }

   return (0);

}

png_byte PNGAPI

png_get_color_type(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

   {

      return info_ptr->color_type;

   }

   return (0);

}

png_byte PNGAPI

png_get_filter_type(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

   {

      return info_ptr->filter_type;

   }

   return (0);

}

png_byte PNGAPI

png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

   {

      return info_ptr->interlace_type;

   }

   return (0);

}

png_byte PNGAPI

png_get_compression_type(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

   {

      return info_ptr->compression_type;

   }

   return (0);

}

png_uint_32 PNGAPI

png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_pHYs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_pHYs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");

      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)

          return (0);

      else return (info_ptr->x_pixels_per_unit);

   }

#else

   return (0);

#endif

   return (0);

}

png_uint_32 PNGAPI

png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_pHYs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_pHYs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");

      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER)

          return (0);

      else return (info_ptr->y_pixels_per_unit);

   }

#else

   return (0);

#endif

   return (0);

}

png_uint_32 PNGAPI

png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_pHYs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_pHYs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");

      if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||

         info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)

          return (0);

      else return (info_ptr->x_pixels_per_unit);

   }

#else

   return (0);

#endif

   return (0);

}

#ifdef PNG_FLOATING_POINT_SUPPORTED

float PNGAPI

png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)

   {

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_pHYs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_pHYs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");

      if (info_ptr->x_pixels_per_unit == 0)

         return ((float)0.0);

      else

         return ((float)((float)info_ptr->y_pixels_per_unit

            /(float)info_ptr->x_pixels_per_unit));

   }

#else

   return (0.0);

#endif

   return ((float)0.0);

}

#endif

png_int_32 PNGAPI

png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_oFFs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_oFFs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");

      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)

          return (0);

      else return (info_ptr->x_offset);

   }

#else

   return (0);

#endif

   return (0);

}

png_int_32 PNGAPI

png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_oFFs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_oFFs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");

      if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)

          return (0);

      else return (info_ptr->y_offset);

   }

#else

   return (0);

#endif

   return (0);

}

png_int_32 PNGAPI

png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_oFFs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_oFFs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");

      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)

          return (0);

      else return (info_ptr->x_offset);

   }

#else

   return (0);

#endif

   return (0);

}

png_int_32 PNGAPI

png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

#if defined(PNG_oFFs_SUPPORTED)

   if (info_ptr->valid & PNG_INFO_oFFs)

   {

      png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");

      if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)

          return (0);

      else return (info_ptr->y_offset);

   }

#else

   return (0);

#endif

   return (0);

}

#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)

png_uint_32 PNGAPI

png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)

{

   return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)

     *.0254 +.5));

}

png_uint_32 PNGAPI

png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)

{

   return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)

     *.0254 +.5));

}

png_uint_32 PNGAPI

png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)

{

   return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)

     *.0254 +.5));

}

float PNGAPI

png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)

{

   return ((float)png_get_x_offset_microns(png_ptr, info_ptr)

     *.00003937);

}

float PNGAPI

png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)

{

   return ((float)png_get_y_offset_microns(png_ptr, info_ptr)

     *.00003937);

}

#if defined(PNG_pHYs_SUPPORTED)

png_uint_32 PNGAPI

png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,

   png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)

{

   png_uint_32 retval = 0;

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))

   {

      png_debug1(1, "in %s retrieval function\n", "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 /* PNG_pHYs_SUPPORTED */

#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */

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

#endif  /* PNG_EASY_ACCESS_SUPPORTED */

png_byte PNGAPI

png_get_channels(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

      return(info_ptr->channels);

   else

      return (0);

}

png_bytep PNGAPI

png_get_signature(png_structp png_ptr, png_infop info_ptr)

{

   if (png_ptr != NULL && info_ptr != NULL)

      return(info_ptr->signature);

   else

      return (NULL);

}

#if defined(PNG_bKGD_SUPPORTED)

png_uint_32 PNGAPI

png_get_bKGD(png_structp png_ptr, png_infop info_ptr,

   png_color_16p *background)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)

      && background != NULL)

   {

      png_debug1(1, "in %s retrieval function\n", "bKGD");

      *background = &(info_ptr->background);

      return (PNG_INFO_bKGD);

   }

   return (0);

}

#endif

#if defined(PNG_cHRM_SUPPORTED)

#ifdef PNG_FLOATING_POINT_SUPPORTED

png_uint_32 PNGAPI

png_get_cHRM(png_structp png_ptr, png_infop 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)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))

   {

      png_debug1(1, "in %s retrieval function\n", "cHRM");

      if (white_x != NULL)

         *white_x = (double)info_ptr->x_white;

      if (white_y != NULL)

         *white_y = (double)info_ptr->y_white;

      if (red_x != NULL)

         *red_x = (double)info_ptr->x_red;

      if (red_y != NULL)

         *red_y = (double)info_ptr->y_red;

      if (green_x != NULL)

         *green_x = (double)info_ptr->x_green;

      if (green_y != NULL)

         *green_y = (double)info_ptr->y_green;

      if (blue_x != NULL)

         *blue_x = (double)info_ptr->x_blue;

      if (blue_y != NULL)

         *blue_y = (double)info_ptr->y_blue;

      return (PNG_INFO_cHRM);

   }

   return (0);

}

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

png_uint_32 PNGAPI

png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,

   png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,

   png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,

   png_fixed_point *blue_x, png_fixed_point *blue_y)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))

   {

      png_debug1(1, "in %s retrieval function\n", "cHRM");

      if (white_x != NULL)

         *white_x = info_ptr->int_x_white;

      if (white_y != NULL)

         *white_y = info_ptr->int_y_white;

      if (red_x != NULL)

         *red_x = info_ptr->int_x_red;

      if (red_y != NULL)

         *red_y = info_ptr->int_y_red;

      if (green_x != NULL)

         *green_x = info_ptr->int_x_green;

      if (green_y != NULL)

         *green_y = info_ptr->int_y_green;

      if (blue_x != NULL)

         *blue_x = info_ptr->int_x_blue;

      if (blue_y != NULL)

         *blue_y = info_ptr->int_y_blue;

      return (PNG_INFO_cHRM);

   }

   return (0);

}

#endif

#endif

#if defined(PNG_gAMA_SUPPORTED)

#ifdef PNG_FLOATING_POINT_SUPPORTED

png_uint_32 PNGAPI

png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)

      && file_gamma != NULL)

   {

      png_debug1(1, "in %s retrieval function\n", "gAMA");

      *file_gamma = (double)info_ptr->gamma;

      return (PNG_INFO_gAMA);

   }

   return (0);

}

#endif

#ifdef PNG_FIXED_POINT_SUPPORTED

png_uint_32 PNGAPI

png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,

    png_fixed_point *int_file_gamma)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)

      && int_file_gamma != NULL)

   {

      png_debug1(1, "in %s retrieval function\n", "gAMA");

      *int_file_gamma = info_ptr->int_gamma;

      return (PNG_INFO_gAMA);

   }

   return (0);

}

#endif

#endif

#if defined(PNG_sRGB_SUPPORTED)

png_uint_32 PNGAPI

png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)

      && file_srgb_intent != NULL)

   {

      png_debug1(1, "in %s retrieval function\n", "sRGB");

      *file_srgb_intent = (int)info_ptr->srgb_intent;

      return (PNG_INFO_sRGB);

   }

   return (0);

}

#endif

#if defined(PNG_iCCP_SUPPORTED)

png_uint_32 PNGAPI

png_get_iCCP(png_structp png_ptr, png_infop info_ptr,

             png_charpp name, int *compression_type,

             png_charpp profile, png_uint_32 *proflen)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)

      && name != NULL && profile != NULL && proflen != NULL)

   {

      png_debug1(1, "in %s retrieval function\n", "iCCP");

      *name = info_ptr->iccp_name;

      *profile = info_ptr->iccp_profile;

      /* compression_type is a dummy so the API won't have to change

         if we introduce multiple compression types later. */

      *proflen = (int)info_ptr->iccp_proflen;

      *compression_type = (int)info_ptr->iccp_compression;

      return (PNG_INFO_iCCP);

   }

   return (0);

}

#endif

#if defined(PNG_sPLT_SUPPORTED)

png_uint_32 PNGAPI

png_get_sPLT(png_structp png_ptr, png_infop info_ptr,

             png_sPLT_tpp spalettes)

{

   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)

   {

     *spalettes = info_ptr->splt_palettes;

     return ((png_uint_32)info_ptr->splt_palettes_num);

   }

   return (0);

}

#endif

#if defined(PNG_hIST_SUPPORTED)

png_uint_32 PNGAPI

png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)

{

   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)

      && hist != NULL)

   {

      png_debug1(1, "in %s retrieval function\n", "hIST");