Scanline decoding for gifs

src/codec/SkBmpCodec.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBmpCodec.h"
 #include "SkBmpMaskCodec.h"
 #include "SkBmpRLECodec.h"
@@ skipping 607 matching lines @@
     }
 
     SkScanlineOrder onGetScanlineOrder() const override {
         if (SkBmpCodec::kTopDown_RowOrder == fCodec->fRowOrder) {
             return kTopDown_SkScanlineOrder;
         } else {
             return kOutOfOrder_SkScanlineOrder;
         }
     }
 
-    int onGetY() const override {
+    int onGetY() override {
         return fCodec->getDstRow(INHERITED::onGetY(), this->dstInfo().height());
     }
 
     // TODO(msarett): Override default skipping with something more clever.
     // TODO(msarett): Consider other optimizations for this codec.
 
 private:
     SkAutoTDelete<SkBmpCodec> fCodec;
 
     typedef SkScanlineDecoder INHERITED;
 };
 
 SkScanlineDecoder* SkBmpCodec::NewSDFromStream(SkStream* stream) {
     SkAutoTDelete<SkBmpCodec> codec(static_cast<SkBmpCodec*>(SkBmpCodec::NewFromStream(stream)));
     if (!codec) {
         return NULL;
     }
 
     return SkNEW_ARGS(SkBmpScanlineDecoder, (codec.detach()));
 }