third_party/libwebp/enc/layer.c

   1 // Copyright 2011 Google Inc. All Rights Reserved.
   2 //
   3 // Use of this source code is governed by a BSD-style license
   4 // that can be found in the COPYING file in the root of the source
   5 // tree. An additional intellectual property rights grant can be found
   6 // in the file PATENTS. All contributing project authors may
   7 // be found in the AUTHORS file in the root of the source tree.
   8 // -----------------------------------------------------------------------------
   9 //
  10 // Enhancement layer (for YUV444/422)
  11 //
  12 // Author: Skal (pascal.massimino@gmail.com)
  13
  14 #include <stdlib.h>
  15
  16 #include "./vp8enci.h"
  17
  18 //------------------------------------------------------------------------------
  19
  20 void VP8EncInitLayer(VP8Encoder* const enc) {
  21   enc->use_layer_ = (enc->pic_->u0 != NULL);
  22   enc->layer_data_size_ = 0;
  23   enc->layer_data_ = NULL;
  24   if (enc->use_layer_) {
  25     VP8BitWriterInit(&enc->layer_bw_, enc->mb_w_ * enc->mb_h_ * 3);
  26   }
  27 }
  28
  29 void VP8EncCodeLayerBlock(VP8EncIterator* it) {
  30   (void)it;   // remove a warning
  31 }
  32
  33 int VP8EncFinishLayer(VP8Encoder* const enc) {
  34   if (enc->use_layer_) {
  35     enc->layer_data_ = VP8BitWriterFinish(&enc->layer_bw_);
  36     enc->layer_data_size_ = VP8BitWriterSize(&enc->layer_bw_);
  37   }
  38   return 1;
  39 }
  40
  41 void VP8EncDeleteLayer(VP8Encoder* enc) {
  42   free(enc->layer_data_);
  43 }
  44