text: 
  /* pngget.c - retrieval of values from info struct
   *
   * Last changed in libpng 1.4.6 [April 8, 2011]
   * Copyright (c) 1998-2011 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.)
   *
   * This code is released under the libpng license.
   * For conditions of distribution and use, see the disclaimer
   * and license in png.h
   *
   */
  
  #define PNG_NO_PEDANTIC_WARNINGS
  #include "png.h"
  #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
  #include "pngpriv.h"
  
  png_uint_32 PNGAPI
  png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr,
      png_uint_32 flag)
  {
     if (png_ptr != NULL && info_ptr != NULL)
        return(info_ptr->valid & flag);
  
     else
        return(0);
  }
  
  png_size_t PNGAPI
  png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
        return(info_ptr->rowbytes);
  
     else
        return(0);
  }
  
  #ifdef PNG_INFO_IMAGE_SUPPORTED
  png_bytepp PNGAPI
  png_get_rows(png_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
        return info_ptr->height;
  
     return (0);
  }
  
  png_byte PNGAPI
  png_get_bit_depth(png_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
  #ifdef PNG_pHYs_SUPPORTED
     if (info_ptr->valid & PNG_INFO_pHYs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
  #ifdef PNG_pHYs_SUPPORTED
     if (info_ptr->valid & PNG_INFO_pHYs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
  #ifdef PNG_pHYs_SUPPORTED
     if (info_ptr->valid & PNG_INFO_pHYs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_infop info_ptr)
     {
     if (png_ptr != NULL && info_ptr != NULL)
  #ifdef PNG_pHYs_SUPPORTED
  
     if (info_ptr->valid & PNG_INFO_pHYs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
  #ifdef PNG_oFFs_SUPPORTED
  
     if (info_ptr->valid & PNG_INFO_oFFs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
  
  #ifdef PNG_oFFs_SUPPORTED
     if (info_ptr->valid & PNG_INFO_oFFs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
  
  #ifdef PNG_oFFs_SUPPORTED
     if (info_ptr->valid & PNG_INFO_oFFs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
  
  #ifdef PNG_oFFs_SUPPORTED
     if (info_ptr->valid & PNG_INFO_oFFs)
     {
        png_debug1(1, "in %s retrieval function", "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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_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_const_structp png_ptr, png_const_infop info_ptr)
  {
     return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
       *.00003937);
  }
  
  float PNGAPI
  png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
  {
     return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
       *.00003937);
  }
  
  #ifdef PNG_pHYs_SUPPORTED
  png_uint_32 PNGAPI
  png_get_pHYs_dpi(png_const_structp png_ptr, png_const_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", "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_const_structp png_ptr, png_const_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
        return(info_ptr->channels);
     else
        return (0);
  }
  
  png_bytep PNGAPI
  png_get_signature(png_const_structp png_ptr, png_infop info_ptr)
  {
     if (png_ptr != NULL && info_ptr != NULL)
        return(info_ptr->signature);
     else
        return (NULL);
  }
  
  #ifdef PNG_bKGD_SUPPORTED
  png_uint_32 PNGAPI
  png_get_bKGD(png_const_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", "bKGD");
  
        *background = &(info_ptr->background);
        return (PNG_INFO_bKGD);
     }
     return (0);
  }
  #endif
  
  #ifdef PNG_cHRM_SUPPORTED
  #ifdef PNG_FLOATING_POINT_SUPPORTED
  png_uint_32 PNGAPI
  png_get_cHRM(png_const_structp png_ptr, png_const_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", "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_const_structp png_ptr, png_const_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)
  {
     png_debug1(1, "in %s retrieval function", "cHRM");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_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
  
  #ifdef PNG_gAMA_SUPPORTED
  #ifdef PNG_FLOATING_POINT_SUPPORTED
  png_uint_32 PNGAPI
  png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr, double *file_gamma)
  {
     png_debug1(1, "in %s retrieval function", "gAMA");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
        && file_gamma != NULL)
     {
        *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_const_structp png_ptr, png_const_infop info_ptr,
      png_fixed_point *int_file_gamma)
  {
     png_debug1(1, "in %s retrieval function", "gAMA");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
        && int_file_gamma != NULL)
     {
        *int_file_gamma = info_ptr->int_gamma;
        return (PNG_INFO_gAMA);
     }
     return (0);
  }
  #endif
  #endif
  
  #ifdef PNG_sRGB_SUPPORTED
  png_uint_32 PNGAPI
  png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr,
      int *file_srgb_intent)
  {
     png_debug1(1, "in %s retrieval function", "sRGB");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
        && file_srgb_intent != NULL)
     {
        *file_srgb_intent = (int)info_ptr->srgb_intent;
        return (PNG_INFO_sRGB);
     }
     return (0);
  }
  #endif
  
  #ifdef PNG_iCCP_SUPPORTED
  png_uint_32 PNGAPI
  png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr,
               png_charpp name, int *compression_type,
               png_charpp profile, png_uint_32 *proflen)
  {
     png_debug1(1, "in %s retrieval function", "iCCP");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
        && name != NULL && profile != NULL && proflen != NULL)
     {
        *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
  
  #ifdef PNG_sPLT_SUPPORTED
  png_uint_32 PNGAPI
  png_get_sPLT(png_const_structp png_ptr, png_const_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
  
  #ifdef PNG_hIST_SUPPORTED
  png_uint_32 PNGAPI
  png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr,
      png_uint_16p *hist)
  {
     png_debug1(1, "in %s retrieval function", "hIST");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
        && hist != NULL)
     {
        *hist = info_ptr->hist;
        return (PNG_INFO_hIST);
     }
     return (0);
  }
  #endif
  
  png_uint_32 PNGAPI
  png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
     png_uint_32 *width, png_uint_32 *height, int *bit_depth,
     int *color_type, int *interlace_type, int *compression_type,
     int *filter_type)
  
  {
     png_debug1(1, "in %s retrieval function", "IHDR");
  
     if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
         height == NULL || bit_depth == NULL || color_type == NULL)
        return (0);
  
     *width = info_ptr->width;
     *height = info_ptr->height;
     *bit_depth = info_ptr->bit_depth;
     *color_type = info_ptr->color_type;
  
     if (compression_type != NULL)
        *compression_type = info_ptr->compression_type;
  
     if (filter_type != NULL)
        *filter_type = info_ptr->filter_type;
  
     if (interlace_type != NULL)
        *interlace_type = info_ptr->interlace_type;
  
     /* This is redundant if we can be sure that the info_ptr values were all
      * assigned in png_set_IHDR().  We do the check anyhow in case an
      * application has ignored our advice not to mess with the members
      * of info_ptr directly.
      */
     png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
         info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
         info_ptr->compression_type, info_ptr->filter_type);
  
     return (1);
  }
  
  #ifdef PNG_oFFs_SUPPORTED
  png_uint_32 PNGAPI
  png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr,
     png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
  {
     png_debug1(1, "in %s retrieval function", "oFFs");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
        && offset_x != NULL && offset_y != NULL && unit_type != NULL)
     {
        *offset_x = info_ptr->x_offset;
        *offset_y = info_ptr->y_offset;
        *unit_type = (int)info_ptr->offset_unit_type;
        return (PNG_INFO_oFFs);
     }
     return (0);
  }
  #endif
  
  #ifdef PNG_pCAL_SUPPORTED
  png_uint_32 PNGAPI
  png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr,
     png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
     png_charp *units, png_charpp *params)
  {
     png_debug1(1, "in %s retrieval function", "pCAL");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
         && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
         nparams != NULL && units != NULL && params != NULL)
     {
        *purpose = info_ptr->pcal_purpose;
        *X0 = info_ptr->pcal_X0;
        *X1 = info_ptr->pcal_X1;
        *type = (int)info_ptr->pcal_type;
        *nparams = (int)info_ptr->pcal_nparams;
        *units = info_ptr->pcal_units;
        *params = info_ptr->pcal_params;
        return (PNG_INFO_pCAL);
     }
     return (0);
  }
  #endif
  
  #ifdef PNG_sCAL_SUPPORTED
  #ifdef PNG_FLOATING_POINT_SUPPORTED
  png_uint_32 PNGAPI
  png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr,
               int *unit, double *width, double *height)
  {
      if (png_ptr != NULL && info_ptr != NULL &&
          (info_ptr->valid & PNG_INFO_sCAL))
      {
          *unit = info_ptr->scal_unit;
          *width = info_ptr->scal_pixel_width;
          *height = info_ptr->scal_pixel_height;
          return (PNG_INFO_sCAL);
      }
      return(0);
  }
  #else
  #ifdef PNG_FIXED_POINT_SUPPORTED
  png_uint_32 PNGAPI
  png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr,
               int *unit, png_charpp width, png_charpp height)
  {
      if (png_ptr != NULL && info_ptr != NULL &&
          (info_ptr->valid & PNG_INFO_sCAL))
      {
          *unit = info_ptr->scal_unit;
          *width = info_ptr->scal_s_width;
          *height = info_ptr->scal_s_height;
          return (PNG_INFO_sCAL);
      }
      return(0);
  }
  #endif
  #endif
  #endif
  
  #ifdef PNG_pHYs_SUPPORTED
  png_uint_32 PNGAPI
  png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr,
     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
  {
     png_uint_32 retval = 0;
  
     png_debug1(1, "in %s retrieval function", "pHYs");
  
     if (png_ptr != NULL && info_ptr != NULL &&
        (info_ptr->valid & PNG_INFO_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;
        }
     }
     return (retval);
  }
  #endif
  
  png_uint_32 PNGAPI
  png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr,
      png_colorp *palette,
     int *num_palette)
  {
     png_debug1(1, "in %s retrieval function", "PLTE");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
         && palette != NULL)
     {
        *palette = info_ptr->palette;
        *num_palette = info_ptr->num_palette;
        png_debug1(3, "num_palette = %d", *num_palette);
        return (PNG_INFO_PLTE);
     }
     return (0);
  }
  
  #ifdef PNG_sBIT_SUPPORTED
  png_uint_32 PNGAPI
  png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr,
      png_color_8p *sig_bit)
  {
     png_debug1(1, "in %s retrieval function", "sBIT");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
        && sig_bit != NULL)
     {
        *sig_bit = &(info_ptr->sig_bit);
        return (PNG_INFO_sBIT);
     }
     return (0);
  }
  #endif
  
  #ifdef PNG_TEXT_SUPPORTED
  png_uint_32 PNGAPI
  png_get_text(png_const_structp png_ptr, png_const_infop info_ptr,
      png_textp *text_ptr, int *num_text)
  {
     if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
     {
        png_debug1(1, "in %s retrieval function",
           (png_ptr->chunk_name[0] == '\0' ? "text"
               : (png_const_charp)png_ptr->chunk_name));
  
        if (text_ptr != NULL)
           *text_ptr = info_ptr->text;
  
        if (num_text != NULL)
           *num_text = info_ptr->num_text;
  
        return ((png_uint_32)info_ptr->num_text);
     }
     if (num_text != NULL)
       *num_text = 0;
     return(0);
  }
  #endif
  
  #ifdef PNG_tIME_SUPPORTED
  png_uint_32 PNGAPI
  png_get_tIME(png_const_structp png_ptr, png_infop info_ptr,
      png_timep *mod_time)
  {
     png_debug1(1, "in %s retrieval function", "tIME");
  
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
         && mod_time != NULL)
     {
        *mod_time = &(info_ptr->mod_time);
        return (PNG_INFO_tIME);
     }
     return (0);
  }
  #endif
  
  #ifdef PNG_tRNS_SUPPORTED
  png_uint_32 PNGAPI
  png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr,
     png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
  {
     png_uint_32 retval = 0;
     if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
     {
        png_debug1(1, "in %s retrieval function", "tRNS");
  
        if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
        {
            if (trans_alpha != NULL)
            {
               *trans_alpha = info_ptr->trans_alpha;
               retval |= PNG_INFO_tRNS;
            }
  
            if (trans_color != NULL)
               *trans_color = &(info_ptr->trans_color);
        }
        else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
        {
            if (trans_color != NULL)
            {
               *trans_color = &(info_ptr->trans_color);
               retval |= PNG_INFO_tRNS;
            }
  
            if (trans_alpha != NULL)
               *trans_alpha = NULL;
        }
        if (num_trans != NULL)
        {
           *num_trans = info_ptr->num_trans;
           retval |= PNG_INFO_tRNS;
        }
     }
     return (retval);
  }
  #endif
  
  #ifdef PNG_APNG_SUPPORTED
  png_uint_32 PNGAPI
  png_get_acTL(png_structp png_ptr, png_infop info_ptr,
               png_uint_32 *num_frames, png_uint_32 *num_plays)
  {
      png_debug1(1, "in %s retrieval function", "acTL");
      
      if (png_ptr != NULL && info_ptr != NULL &&
          (info_ptr->valid & PNG_INFO_acTL) &&
          num_frames != NULL && num_plays != NULL)
      {
          *num_frames = info_ptr->num_frames;
          *num_plays = info_ptr->num_plays;
          return (1);
      }
      
      return (0);
  }
  
  png_uint_32 PNGAPI
  png_get_num_frames(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_num_frames()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->num_frames);
      return (0);
  }
  
  png_uint_32 PNGAPI
  png_get_num_plays(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_num_plays()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->num_plays);
      return (0);
  }
  
  png_uint_32 PNGAPI
  png_get_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
               png_uint_32 *width, png_uint_32 *height,
               png_uint_32 *x_offset, png_uint_32 *y_offset,
               png_uint_16 *delay_num, png_uint_16 *delay_den,
               png_byte *dispose_op, png_byte *blend_op)
  {
      png_debug1(1, "in %s retrieval function", "fcTL");
      
      if (png_ptr != NULL && info_ptr != NULL &&
          (info_ptr->valid & PNG_INFO_fcTL) &&
          width != NULL && height != NULL && 
          x_offset != NULL && y_offset != NULL && 
          delay_num != NULL && delay_den != NULL &&
  	dispose_op != NULL && blend_op != NULL)
      {
          *width = info_ptr->next_frame_width;
          *height = info_ptr->next_frame_height;
          *x_offset = info_ptr->next_frame_x_offset;
          *y_offset = info_ptr->next_frame_y_offset;
          *delay_num = info_ptr->next_frame_delay_num;
          *delay_den = info_ptr->next_frame_delay_den;
          *dispose_op = info_ptr->next_frame_dispose_op;
          *blend_op = info_ptr->next_frame_blend_op;
          return (1);
      }
      
      return (0);
  }
  
  png_uint_32 PNGAPI
  png_get_next_frame_width(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_width()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_width);
      return (0);
  }
  
  png_uint_32 PNGAPI
  png_get_next_frame_height(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_height()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_height);
      return (0);
  }
  
  png_uint_32 PNGAPI
  png_get_next_frame_x_offset(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_x_offset()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_x_offset);
      return (0);
  }
  
  png_uint_32 PNGAPI
  png_get_next_frame_y_offset(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_y_offset()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_y_offset);
      return (0);
  }
  
  png_uint_16 PNGAPI
  png_get_next_frame_delay_num(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_delay_num()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_delay_num);
      return (0);
  }
  
  png_uint_16 PNGAPI
  png_get_next_frame_delay_den(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_delay_den()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_delay_den);
      return (0);
  }
  
  png_byte PNGAPI
  png_get_next_frame_dispose_op(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_dispose_op()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_dispose_op);
      return (0);
  }
  
  png_byte PNGAPI
  png_get_next_frame_blend_op(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_get_next_frame_blend_op()");
      
      if (png_ptr != NULL && info_ptr != NULL)
          return (info_ptr->next_frame_blend_op);
      return (0);
  }
  
  png_byte PNGAPI
  png_get_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr)
  {
      png_debug(1, "in png_first_frame_is_hidden()");
      
      if (png_ptr != NULL)
         return (png_byte)(png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN);
      
      return 0;
  }
  #endif /* PNG_APNG_SUPPORTED */
  
  #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
  png_uint_32 PNGAPI
  png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr,
               png_unknown_chunkpp unknowns)
  {
     if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
     {
       *unknowns = info_ptr->unknown_chunks;
       return ((png_uint_32)info_ptr->unknown_chunks_num);
     }
     return (0);
  }
  #endif
  
  #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
  png_byte PNGAPI
  png_get_rgb_to_gray_status(png_const_structp png_ptr)
  {
     return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
  }
  #endif
  
  #ifdef PNG_USER_CHUNKS_SUPPORTED
  png_voidp PNGAPI
  png_get_user_chunk_ptr(png_const_structp png_ptr)
  {
     return (png_ptr? png_ptr->user_chunk_ptr : NULL);
  }
  #endif
  
  png_size_t PNGAPI
  png_get_compression_buffer_size(png_const_structp png_ptr)
  {
     return (png_ptr ? png_ptr->zbuf_size : 0L);
  }
  
  
  #ifdef PNG_SET_USER_LIMITS_SUPPORTED
  /* These functions were added to libpng 1.2.6 and were enabled
   * by default in libpng-1.4.0 */
  png_uint_32 PNGAPI
  png_get_user_width_max(png_const_structp png_ptr)
  {
      return (png_ptr? png_ptr->user_width_max : 0);
  }
  png_uint_32 PNGAPI
  png_get_user_height_max(png_const_structp png_ptr)
  {
      return (png_ptr? png_ptr->user_height_max : 0);
  }
  /* This function was added to libpng 1.4.0 */
  png_uint_32 PNGAPI
  png_get_chunk_cache_max(png_const_structp png_ptr)
  {
      return (png_ptr? png_ptr->user_chunk_cache_max : 0);
  }
  /* This function was added to libpng 1.4.1 */
  png_alloc_size_t PNGAPI
  png_get_chunk_malloc_max(png_const_structp png_ptr)
  {
      return (png_ptr?
         png_ptr->user_chunk_malloc_max : 0);
  }
  #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
  
  /* These functions were added to libpng 1.4.0 */
  #ifdef PNG_IO_STATE_SUPPORTED
  png_uint_32 PNGAPI
  png_get_io_state(png_const_structp png_ptr)
  {
      return png_ptr->io_state;
  }
  
  png_bytep PNGAPI
  png_get_io_chunk_name(png_structp png_ptr)
  {
     return png_ptr->chunk_name;
  }
  #endif /* ?PNG_IO_STATE_SUPPORTED */
  
  #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
  