libwebp: update to 0.5.0

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.
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <stdlib.h>
 #include "./alphai.h"
 #include "./vp8i.h"
 #include "./vp8li.h"
+#include "../dsp/dsp.h"
 #include "../utils/quant_levels_dec.h"
 #include "../utils/utils.h"
 #include "../webp/format_constants.h"
 
 //------------------------------------------------------------------------------
 // ALPHDecoder object.
 
 ALPHDecoder* ALPHNew(void) {
   ALPHDecoder* const dec = (ALPHDecoder*)WebPSafeCalloc(1ULL, sizeof(*dec));
   return dec;
@@ skipping 43 matching lines @@
     return 0;
   }
 
   if (dec->method_ == ALPHA_NO_COMPRESSION) {
     const size_t alpha_decoded_size = dec->width_ * dec->height_;
     ok = (alpha_data_size >= alpha_decoded_size);
   } else {
     assert(dec->method_ == ALPHA_LOSSLESS_COMPRESSION);
     ok = VP8LDecodeAlphaHeader(dec, alpha_data, alpha_data_size, output);
   }
+  VP8FiltersInit();
   return ok;
 }
 
 // Decodes, unfilters and dequantizes *at least* 'num_rows' rows of alpha
 // starting from row number 'row'. It assumes that rows up to (row - 1) have
 // already been decoded.
 // Returns false in case of bitstream error.
 static int ALPHDecode(VP8Decoder* const dec, int row, int num_rows) {
   ALPHDecoder* const alph_dec = dec->alph_dec_;
   const int width = alph_dec->width_;
@@ skipping 65 matching lines @@
     if (!ok || dec->is_alpha_decoded_) {
       ALPHDelete(dec->alph_dec_);
       dec->alph_dec_ = NULL;
     }
     if (!ok) return NULL;  // Error.
   }
 
   // Return a pointer to the current decoded row.
   return dec->alpha_plane_ + row * width;
 }