libwebp-0.5.2-rc2

third_party/libwebp/dec/alpha.c

 // Copyright 2011 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS. All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // Alpha-plane decompression.
@@ skipping 49 matching lines @@
   dec->output_ = output;
   dec->width_ = src_io->width;
   dec->height_ = src_io->height;
   assert(dec->width_ > 0 && dec->height_ > 0);
 
   if (data_size <= ALPHA_HEADER_LEN) {
     return 0;
   }
 
   dec->method_ = (data[0] >> 0) & 0x03;
-  dec->filter_ = (data[0] >> 2) & 0x03;
+  dec->filter_ = (WEBP_FILTER_TYPE)((data[0] >> 2) & 0x03);
   dec->pre_processing_ = (data[0] >> 4) & 0x03;
   rsrv = (data[0] >> 6) & 0x03;
   if (dec->method_ < ALPHA_NO_COMPRESSION ||
       dec->method_ > ALPHA_LOSSLESS_COMPRESSION ||
       dec->filter_ >= WEBP_FILTER_LAST ||
       dec->pre_processing_ > ALPHA_PREPROCESSED_LEVELS ||
       rsrv != 0) {
     return 0;
   }
 
@@ skipping 142 matching lines @@
     }
   }
 
   // Return a pointer to the current decoded row.
   return dec->alpha_plane_ + row * width;
 
  Error:
   WebPDeallocateAlphaMemory(dec);
   return NULL;
 }