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 *

 * Last changed in libpng 1.5.1 [February 3, 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

 *

 */

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);

}

png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr)

{

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

      return(info_ptr->rowbytes);

}

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);

}

#endif

/* 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;

}

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;

}

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;

}

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;

}

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;

}

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;

}

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;

}

png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_pHYs_SUPPORTED

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

      {

         png_debug1(1, "in %s retrieval function",

             "png_get_x_pixels_per_meter");

            return (info_ptr->x_pixels_per_unit);

      }

#endif

}

png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_pHYs_SUPPORTED

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

   {

      png_debug1(1, "in %s retrieval function",

          "png_get_y_pixels_per_meter");

         return (info_ptr->y_pixels_per_unit);

   }

#endif

}

png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_pHYs_SUPPORTED

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

   {

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

          info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)

         return (info_ptr->x_pixels_per_unit);

   }

#endif

}

float PNGAPI

png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_READ_pHYs_SUPPORTED

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

   {

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

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

             /(float)info_ptr->x_pixels_per_unit));

   }

#endif

}

#endif

png_fixed_point PNGAPI

png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr,

    png_const_infop info_ptr)

{

#ifdef PNG_READ_pHYs_SUPPORTED

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

       && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0

       && info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX

       && info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)

   {

      png_fixed_point res;

       * range of 0..2^31-1; otherwise the cast might overflow.

       */

      if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,

          (png_int_32)info_ptr->x_pixels_per_unit))

         return res;

   }

#endif

}

#endif

png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_oFFs_SUPPORTED

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

   {

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

         return (info_ptr->x_offset);

   }

#endif

}

png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_oFFs_SUPPORTED

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

   {

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

         return (info_ptr->y_offset);

   }

#endif

}

png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_oFFs_SUPPORTED

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

   {

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

         return (info_ptr->x_offset);

   }

#endif

}

png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)

{

#ifdef PNG_oFFs_SUPPORTED

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

   {

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

         return (info_ptr->y_offset);

   }

#endif

}

static png_uint_32

ppi_from_ppm(png_uint_32 ppm)

{

#if 0

   /* The conversion is *(2.54/100), in binary (32 digits):

    * .00000110100000001001110101001001

    */

   png_uint_32 t1001, t1101;

   ppm >>= 1;                  /* .1 */

   t1001 = ppm + (ppm >> 3);   /* .1001 */

   t1101 = t1001 + (ppm >> 1); /* .1101 */

   ppm >>= 20;                 /* .000000000000000000001 */

   t1101 += t1101 >> 15;       /* .1101000000000001101 */

   t1001 >>= 11;               /* .000000000001001 */

   t1001 += t1001 >> 12;       /* .000000000001001000000001001 */

   ppm += t1001;               /* .000000000001001000001001001 */

   ppm += t1101;               /* .110100000001001110101001001 */

   return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */

#else

   /* The argument is a PNG unsigned integer, so it is not permitted

    * to be bigger than 2^31.

    */

   png_fixed_point result;

   if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,

       5000))

      return result;

   return 0;

#endif

}

png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)

{

   return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));

}

png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)

{

   return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));

}

png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)

{

   return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));

}

static png_fixed_point

png_fixed_inches_from_microns(png_structp png_ptr, png_int_32 microns)

{

   /* Convert from metres * 1,000,000 to inches * 100,000, meters to

    * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.

    * Notice that this can overflow - a warning is output and 0 is

    * returned.

    */

   return png_muldiv_warn(png_ptr, microns, 500, 127);

}

png_get_x_offset_inches_fixed(png_structp png_ptr,

    png_const_infop info_ptr)

{

   return png_fixed_inches_from_microns(png_ptr,

       png_get_x_offset_microns(png_ptr, info_ptr));

}

#endif

png_fixed_point PNGAPI

png_get_y_offset_inches_fixed(png_structp png_ptr,

    png_const_infop info_ptr)

{

   return png_fixed_inches_from_microns(png_ptr,

       png_get_y_offset_microns(png_ptr, info_ptr));

}

#endif

float PNGAPI

png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)

{

   /* To avoid the overflow do the conversion directly in floating

    * point.

    */

   return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);

}

#endif

float PNGAPI

png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)

{

   /* To avoid the overflow do the conversion directly in floating

    * point.

    */

   return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);

}

#endif

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;

   {

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

      {

         *res_x = info_ptr->x_pixels_per_unit;

         retval |= PNG_INFO_pHYs;

      }

      {

         *res_y = info_ptr->y_pixels_per_unit;

         retval |= PNG_INFO_pHYs;

      }

      {

         *unit_type = (int)info_ptr->phys_unit_type;

         retval |= PNG_INFO_pHYs;

         {

            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);

         }

      }

   }

}

#endif /* PNG_pHYs_SUPPORTED */

#endif  /* PNG_INCH_CONVERSIONS_SUPPORTED */

png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr)

{

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

      return(info_ptr->channels);

}

png_get_signature(png_const_structp png_ptr, png_infop info_ptr)

{

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

      return(info_ptr->signature);

}

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");

      return (PNG_INFO_bKGD);

   }

}

#endif

#  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");

         *white_x = png_float(png_ptr, info_ptr->x_white, "cHRM white X");

      if (white_y != NULL)

         *white_y = png_float(png_ptr, info_ptr->y_white, "cHRM white Y");

      if (red_x != NULL)

         *red_x = png_float(png_ptr, info_ptr->x_red, "cHRM red X");

      if (red_y != NULL)

         *red_y = png_float(png_ptr, info_ptr->y_red, "cHRM red Y");

      if (green_x != NULL)

         *green_x = png_float(png_ptr, info_ptr->x_green, "cHRM green X");

      if (green_y != NULL)

         *green_y = png_float(png_ptr, info_ptr->y_green, "cHRM green Y");

      if (blue_x != NULL)

         *blue_x = png_float(png_ptr, info_ptr->x_blue, "cHRM blue X");

      if (blue_y != NULL)

         *blue_y = png_float(png_ptr, info_ptr->y_blue, "cHRM blue Y");

      return (PNG_INFO_cHRM);

   }

}

#  endif

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 (white_x != NULL)

         *white_x = info_ptr->x_white;

      if (white_y != NULL)

         *white_y = info_ptr->y_white;

      if (red_x != NULL)

         *red_x = info_ptr->x_red;

      if (red_y != NULL)

         *red_y = info_ptr->y_red;

      if (green_x != NULL)

         *green_x = info_ptr->x_green;

      if (green_y != NULL)

         *green_y = info_ptr->y_green;

      if (blue_x != NULL)

         *blue_x = info_ptr->x_blue;

      if (blue_y != NULL)

         *blue_y = info_ptr->y_blue;

      return (PNG_INFO_cHRM);

   }

}

#  endif

#endif

png_uint_32 PNGFAPI

png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr,

    png_fixed_point *file_gamma)

{

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

       && file_gamma != NULL)

   {

      *file_gamma = info_ptr->gamma;

      return (PNG_INFO_gAMA);

   }

}

#  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_fixed_point igamma;

   png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma);

      *file_gamma = png_float(png_ptr, igamma, "png_get_gAMA");

}

#endif

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");

       && file_srgb_intent != NULL)

   {

      *file_srgb_intent = (int)info_ptr->srgb_intent;

      return (PNG_INFO_sRGB);

   }

}

#endif

png_uint_32 PNGAPI

png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr,

    png_charpp name, int *compression_type,

    png_bytepp profile, png_uint_32 *proflen)

{

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

   }

}

#endif

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);

   }

}

#endif

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");

       && hist != NULL)

   {

      *hist = info_ptr->hist;

      return (PNG_INFO_hIST);

   }

}

#endif

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");

       height == NULL || bit_depth == NULL || color_type == NULL)

      return (0);

   *height = info_ptr->height;

   *bit_depth = info_ptr->bit_depth;

   *color_type = info_ptr->color_type;

      *compression_type = info_ptr->compression_type;

      *filter_type = info_ptr->filter_type;

      *interlace_type = info_ptr->interlace_type;

    * 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);

}

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");

       && 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);

   }

}

#endif

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");

       && 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);

   }

}

#endif

#  ifdef PNG_FIXED_POINT_SUPPORTED

#    ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED

png_uint_32 PNGAPI

png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr,

    int *unit, png_fixed_point *width, png_fixed_point *height)

{

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

       (info_ptr->valid & PNG_INFO_sCAL))

   {

      *unit = info_ptr->scal_unit;

      /*TODO: make this work without FP support */

      *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");

      *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),

         "sCAL height");

      return (PNG_INFO_sCAL);

   }

}

#    endif /* FLOATING_ARITHMETIC */

#  endif /* FIXED_POINT */

#  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 = atof(info_ptr->scal_s_width);

      *height = atof(info_ptr->scal_s_height);

      return (PNG_INFO_sCAL);

   }

}

#  endif /* FLOATING POINT */

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);

   }

}

#endif /* sCAL */

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;

       (info_ptr->valid & PNG_INFO_pHYs))

   {

      if (res_x != NULL)

      {

         *res_x = info_ptr->x_pixels_per_unit;

         retval |= PNG_INFO_pHYs;

      }

      {

         *res_y = info_ptr->y_pixels_per_unit;

         retval |= PNG_INFO_pHYs;

      }

      {

         *unit_type = (int)info_ptr->phys_unit_type;

         retval |= PNG_INFO_pHYs;

      }

   }

}

#endif /* pHYs */

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");

       && palette != NULL)

   {

      *palette = info_ptr->palette;

      *num_palette = info_ptr->num_palette;

      png_debug1(3, "num_palette = %d", *num_palette);

      return (PNG_INFO_PLTE);

   }

}

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");

       && sig_bit != NULL)

   {

      *sig_bit = &(info_ptr->sig_bit);

      return (PNG_INFO_sBIT);

   }

}

#endif

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));

         *text_ptr = info_ptr->text;

         *num_text = info_ptr->num_text;

   }

      *num_text = 0;

}

#endif

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");

       && mod_time != NULL)

   {

      *mod_time = &(info_ptr->mod_time);

      return (PNG_INFO_tIME);

   }

}

#endif

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 (trans_alpha != NULL)

         {

            *trans_alpha = info_ptr->trans_alpha;

            retval |= PNG_INFO_tRNS;

         }

            *trans_color = &(info_ptr->trans_color);

      }

      {

         if (trans_color != NULL)

         {

            *trans_color = &(info_ptr->trans_color);

            retval |= PNG_INFO_tRNS;

         }

            *trans_alpha = NULL;

      }

      {

         *num_trans = info_ptr->num_trans;

         retval |= PNG_INFO_tRNS;

      }

   }

}

#endif

int 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 info_ptr->unknown_chunks_num;

   }

}

#endif

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

png_voidp PNGAPI

png_get_user_chunk_ptr(png_const_structp png_ptr)

{

   return (png_ptr ? png_ptr->user_chunk_ptr : NULL);

}

#endif

png_get_compression_buffer_size(png_const_structp png_ptr)

{

   return (png_ptr ? png_ptr->zbuf_size : 0L);

}

/* 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_get_user_height_max (png_const_structp png_ptr)

{

   return (png_ptr ? png_ptr->user_height_max : 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);

}

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 */

#ifdef PNG_IO_STATE_SUPPORTED

png_uint_32 PNGAPI

png_get_io_state (png_structp png_ptr)

{

   return png_ptr->io_state;

}

png_get_io_chunk_type (png_const_structp png_ptr)

{

   return ((png_ptr->chunk_name[0] << 24) +

           (png_ptr->chunk_name[1] << 16) +

           (png_ptr->chunk_name[2] <<  8) +

           (png_ptr->chunk_name[3]));

}

png_get_io_chunk_name (png_structp png_ptr)

{

   return png_ptr->chunk_name;

}

#endif /* ?PNG_IO_STATE_SUPPORTED */