Update libpng to 1.2.33.

third_party/libpng/pngwtran.c

 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
  * Last changed in libpng 1.2.9 April 14, 2006
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2006 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"
 #ifdef PNG_WRITE_SUPPORTED
 
 /* Transform the data according to the user's wishes.  The order of
  * transformations is significant.
  */
 void /* PRIVATE */
 png_do_write_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_do_write_transformations\n");
 
    if (png_ptr == NULL)
       return;
 
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
    if (png_ptr->transformations & PNG_USER_TRANSFORM)
-      if(png_ptr->write_user_transform_fn != NULL)
+      if (png_ptr->write_user_transform_fn != NULL)
         (*(png_ptr->write_user_transform_fn)) /* user write transform function */
           (png_ptr,                    /* png_ptr */
            &(png_ptr->row_info),       /* row_info:     */
              /*  png_uint_32 width;          width of row */
              /*  png_uint_32 rowbytes;       number of bytes in row */
              /*  png_byte color_type;        color type of pixels */
              /*  png_byte bit_depth;         bit depth of samples */
              /*  png_byte channels;          number of channels (1-4) */
              /*  png_byte pixel_depth;       bits per pixel (depth*channels) */
            png_ptr->row_buf + 1);      /* start of pixel data for row */
@@ skipping 512 matching lines @@
          else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
             bytes_per_pixel = 8;
          else
             return;
 
          for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
          {
             png_uint_32 s0   = (*(rp  ) << 8) | *(rp+1);
             png_uint_32 s1   = (*(rp+2) << 8) | *(rp+3);
             png_uint_32 s2   = (*(rp+4) << 8) | *(rp+5);
-            png_uint_32 red  = (png_uint_32)((s0-s1) & 0xffffL);
-            png_uint_32 blue = (png_uint_32)((s2-s1) & 0xffffL);
+            png_uint_32 red  = (png_uint_32)((s0 - s1) & 0xffffL);
+            png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
             *(rp  ) = (png_byte)((red >> 8) & 0xff);
             *(rp+1) = (png_byte)(red & 0xff);
             *(rp+4) = (png_byte)((blue >> 8) & 0xff);
             *(rp+5) = (png_byte)(blue & 0xff);
          }
       }
    }
 }
 #endif /* PNG_MNG_FEATURES_SUPPORTED */
 #endif /* PNG_WRITE_SUPPORTED */