pngrtran.c

a 3d car ....with color texture..

            }
         }
      }
   }
}
#endif

#if defined(PNG_READ_FILLER_SUPPORTED)
/* Add filler channel if we have RGB color */
void
png_do_read_filler(png_row_infop row_info, png_bytep row,
   png_uint_32 filler, png_uint_32 flags)
{
   png_uint_32 i;
   png_uint_32 row_width = row_info->width;

   png_byte hi_filler = (png_byte)((filler>>8) & 0xff);
   png_byte low_filler = (png_byte)(filler & 0xff);

   png_debug(1, "in png_do_read_filler\n");
   if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
       row != NULL  && row_info != NULL &&
#endif
       row_info->color_type == PNG_COLOR_TYPE_GRAY)
   {
      if(row_info->bit_depth == 8)
      {
         /* This changes the data from G to GX */
         if (flags & PNG_FLAG_FILLER_AFTER)
         {
            png_bytep sp = row + (png_size_t)row_width;
            png_bytep dp =  sp + (png_size_t)row_width;
            for (i = 1; i < row_width; i++)
            {
               *(--dp) = low_filler;
               *(--dp) = *(--sp);
            }
            row_info->channels = 2;
            row_info->pixel_depth = 16;
            row_info->rowbytes = row_width * 2;
         }
      /* This changes the data from G to XG */
         else
         {
            png_bytep sp = row + (png_size_t)row_width;
            png_bytep dp = sp  + (png_size_t)row_width;
            for (i = 0; i < row_width; i++)
            {
               *(--dp) = *(--sp);
               *(--dp) = low_filler;
            }
            row_info->channels = 2;
            row_info->pixel_depth = 16;
            row_info->rowbytes = row_width * 2;
         }
      }
      else if(row_info->bit_depth == 16)
      {
         /* This changes the data from GG to GGXX */
         if (flags & PNG_FLAG_FILLER_AFTER)
         {
            png_bytep sp = row + (png_size_t)row_width;
            png_bytep dp = sp  + (png_size_t)row_width;
            for (i = 1; i < row_width; i++)
            {
               *(--dp) = hi_filler;
               *(--dp) = low_filler;
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
            }
            row_info->channels = 2;
            row_info->pixel_depth = 32;
            row_info->rowbytes = row_width * 2;
         }
         /* This changes the data from GG to XXGG */
         else
         {
            png_bytep sp = row + (png_size_t)row_width;
            png_bytep dp = sp  + (png_size_t)row_width;
            for (i = 0; i < row_width; i++)
            {
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = hi_filler;
               *(--dp) = low_filler;
            }
            row_info->channels = 2;
            row_info->pixel_depth = 16;
            row_info->rowbytes = row_width * 2;
         }
      }
   } /* COLOR_TYPE == GRAY */
   else if (row_info->color_type == PNG_COLOR_TYPE_RGB)
   {
      if(row_info->bit_depth == 8)
      {
         /* This changes the data from RGB to RGBX */
         if (flags & PNG_FLAG_FILLER_AFTER)
         {
            png_bytep sp = row + (png_size_t)row_width * 3;
            png_bytep dp = sp  + (png_size_t)row_width;
            for (i = 1; i < row_width; i++)
            {
               *(--dp) = low_filler;
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
            }
            row_info->channels = 4;
            row_info->pixel_depth = 32;
            row_info->rowbytes = row_width * 4;
         }
      /* This changes the data from RGB to XRGB */
         else
         {
            png_bytep sp = row + (png_size_t)row_width * 3;
            png_bytep dp = sp + (png_size_t)row_width;
            for (i = 0; i < row_width; i++)
            {
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = low_filler;
            }
            row_info->channels = 4;
            row_info->pixel_depth = 32;
            row_info->rowbytes = row_width * 4;
         }
      }
      else if(row_info->bit_depth == 16)
      {
         /* This changes the data from RRGGBB to RRGGBBXX */
         if (flags & PNG_FLAG_FILLER_AFTER)
         {
            png_bytep sp = row + (png_size_t)row_width * 3;
            png_bytep dp = sp  + (png_size_t)row_width;
            for (i = 1; i < row_width; i++)
            {
               *(--dp) = hi_filler;
               *(--dp) = low_filler;
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
            }
            row_info->channels = 4;
            row_info->pixel_depth = 64;
            row_info->rowbytes = row_width * 4;
         }
         /* This changes the data from RRGGBB to XXRRGGBB */
         else
         {
            png_bytep sp = row + (png_size_t)row_width * 3;
            png_bytep dp = sp  + (png_size_t)row_width;
            for (i = 0; i < row_width; i++)
            {
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = *(--sp);
               *(--dp) = hi_filler;
               *(--dp) = low_filler;
            }
            row_info->channels = 4;
            row_info->pixel_depth = 64;
            row_info->rowbytes = row_width * 4;
         }
      }
   } /* COLOR_TYPE == RGB */
}
#endif

#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
/* expand grayscale files to RGB, with or without alpha */
void
png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
{
   png_uint_32 i;
   png_uint_32 row_width = row_info->width;

   png_debug(1, "in png_do_gray_to_rgb\n");
   if (row_info->bit_depth >= 8 &&
#if defined(PNG_USELESS_TESTS_SUPPORTED)
       row != NULL && row_info != NULL &&
#endif
      !(row_info->color_type & PNG_COLOR_MASK_COLOR))
   {
      if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
      {
         if (row_info->bit_depth == 8)
         {
            png_bytep sp = row + (png_size_t)row_width - 1;
            png_bytep dp = sp  + (png_size_t)row_width * 2;
            for (i = 0; i < row_width; i++)
            {
               *(dp--) = *sp;
               *(dp--) = *sp;
               *(dp--) = *sp;
               sp--;
            }
         }
         else
         {
            png_bytep sp = row + (png_size_t)row_width * 2 - 1;
            png_bytep dp = sp  + (png_size_t)row_width * 4;
            for (i = 0; i < row_width; i++)
            {
               *(dp--) = *sp;
               *(dp--) = *(sp - 1);
               *(dp--) = *sp;
               *(dp--) = *(sp - 1);
               *(dp--) = *sp;
               *(dp--) = *(sp - 1);
               sp--;
               sp--;
            }
         }
      }
      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
      {
         if (row_info->bit_depth == 8)
         {
            png_bytep sp = row + (png_size_t)row_width * 2 - 1;
            png_bytep dp = sp  + (png_size_t)row_width * 2;
            for (i = 0; i < row_width; i++)
            {
               *(dp--) = *(sp--);
               *(dp--) = *sp;
               *(dp--) = *sp;
               *(dp--) = *sp;
               sp--;
            }
         }
         else
         {
            png_bytep sp = row + (png_size_t)row_width * 4 - 1;
            png_bytep dp = sp  + (png_size_t)row_width * 4;
            for (i = 0; i < row_width; i++)
            {
               *(dp--) = *(sp--);
               *(dp--) = *(sp--);
               *(dp--) = *sp;
               *(dp--) = *(sp - 1);
               *(dp--) = *sp;
               *(dp--) = *(sp - 1);
               *(dp--) = *sp;
               *(dp--) = *(sp - 1);
               sp--;
               sp--;
            }
         }
      }
      row_info->channels += (png_byte)2;
      row_info->color_type |= PNG_COLOR_MASK_COLOR;
      row_info->pixel_depth = (png_byte)(row_info->channels *
         row_info->bit_depth);
      row_info->rowbytes = ((row_width *
         row_info->pixel_depth + 7) >> 3);
   }
}
#endif

/* This function is currently unused.  Do we really need it? */
#if defined(PNG_READ_DITHER_SUPPORTED) && defined(PNG_CORRECT_PALETTE_SUPPORTED)
void
png_correct_palette(png_structp png_ptr, png_colorp palette,
   int num_palette)
{
   png_debug(1, "in png_correct_palette\n");
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
   if ((png_ptr->transformations & (PNG_GAMMA)) &&
      (png_ptr->transformations & (PNG_BACKGROUND)))
   {
      png_color back, back_1;

      if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
      {
         back.red = png_ptr->gamma_table[png_ptr->background.red];
         back.green = png_ptr->gamma_table[png_ptr->background.green];
         back.blue = png_ptr->gamma_table[png_ptr->background.blue];

         back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
         back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
         back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
      }
      else
      {
         double g;

         g = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma);

         if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_SCREEN ||
             fabs(g - 1.0) < PNG_GAMMA_THRESHOLD)
         {
            back.red = png_ptr->background.red;
            back.green = png_ptr->background.green;
            back.blue = png_ptr->background.blue;
         }
         else
         {
            back.red =
               (png_byte)(pow((double)png_ptr->background.red/255, g) *
                255.0 + 0.5);
            back.green =
               (png_byte)(pow((double)png_ptr->background.green/255, g) *
                255.0 + 0.5);
            back.blue =
               (png_byte)(pow((double)png_ptr->background.blue/255, g) *
                255.0 + 0.5);
         }

         g = 1.0 / png_ptr->background_gamma;

         back_1.red =
            (png_byte)(pow((double)png_ptr->background.red/255, g) *
             255.0 + 0.5);
         back_1.green =
            (png_byte)(pow((double)png_ptr->background.green/255, g) *
             255.0 + 0.5);
         back_1.blue =
            (png_byte)(pow((double)png_ptr->background.blue/255, g) *
             255.0 + 0.5);
      }

      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
      {
         png_uint_32 i;

         for (i = 0; i < (png_uint_32)num_palette; i++)
         {
            if (i < png_ptr->num_trans && png_ptr->trans[i] == 0)
            {
               palette[i] = back;
            }
            else if (i < png_ptr->num_trans && png_ptr->trans[i] != 0xff)
            {
               png_byte v, w;

               v = png_ptr->gamma_to_1[png_ptr->palette[i].red];
               png_composite(w, v, png_ptr->trans[i], back_1.red);
               palette[i].red = png_ptr->gamma_from_1[w];

               v = png_ptr->gamma_to_1[png_ptr->palette[i].green];
               png_composite(w, v, png_ptr->trans[i], back_1.green);
               palette[i].green = png_ptr->gamma_from_1[w];

               v = png_ptr->gamma_to_1[png_ptr->palette[i].blue];
               png_composite(w, v, png_ptr->trans[i], back_1.blue);
               palette[i].blue = png_ptr->gamma_from_1[w];
            }
            else
            {
               palette[i].red = png_ptr->gamma_table[palette[i].red];
               palette[i].green = png_ptr->gamma_table[palette[i].green];
               palette[i].blue = png_ptr->gamma_table[palette[i].blue];
            }
         }
      }
      else
      {
         int i;

         for (i = 0; i < num_palette; i++)
         {
            if (palette[i].red == (png_byte)png_ptr->trans_values.gray)
            {
               palette[i] = back;
            }
            else
            {
               palette[i].red = png_ptr->gamma_table[palette[i].red];
               palette[i].green = png_ptr->gamma_table[palette[i].green];
               palette[i].blue = png_ptr->gamma_table[palette[i].blue];
            }
         }
      }
   }
   else
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
   if (png_ptr->transformations & PNG_GAMMA)
   {
      int i;

      for (i = 0; i < num_palette; i++)
      {
         palette[i].red = png_ptr->gamma_table[palette[i].red];
         palette[i].green = png_ptr->gamma_table[palette[i].green];
         palette[i].blue = png_ptr->gamma_table[palette[i].blue];
      }
   }
#if defined(PNG_READ_BACKGROUND_SUPPORTED