Scanline decoding for gifs

dm/DMSrcSink.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 "DMSrcSink.h"
 #include "SamplePipeControllers.h"
 #include "SkCodec.h"
@@ skipping 334 matching lines @@
             canvas->drawBitmap(bitmap, 0, 0);
             break;
         }
         case kScanline_Mode: {
             SkAutoTDelete<SkScanlineDecoder> scanlineDecoder(
                     start_scanline_decoder(encoded.get(), decodeInfo, colorPtr, colorCountPtr));
             if (nullptr == scanlineDecoder) {
                 return Error::Nonfatal("Could not start scanline decoder");
             }
 
-            const SkCodec::Result result = scanlineDecoder->getScanlines(
-                    bitmap.getAddr(0, 0), decodeInfo.height(), bitmap.rowBytes());
+            SkCodec::Result result = SkCodec::kUnimplemented;
+            switch (scanlineDecoder->getScanlineOrder()) {
+                case SkScanlineDecoder::kTopDown_SkScanlineOrder:
+                case SkScanlineDecoder::kBottomUp_SkScanlineOrder:
+                case SkScanlineDecoder::kNone_SkScanlineOrder:
+                    result = scanlineDecoder->getScanlines(bitmap.getAddr(0, 0),
+                            decodeInfo.height(), bitmap.rowBytes());
+                    break;
+                case SkScanlineDecoder::kOutOfOrder_SkScanlineOrder: {
+                    for (int y = 0; y < decodeInfo.height(); y++) {
+                        int dstY = scanlineDecoder->getY();
+                        void* dstPtr = bitmap.getAddr(0, dstY);
+                        result = scanlineDecoder->getScanlines(dstPtr, 1, bitmap.rowBytes());
+                        if (SkCodec::kSuccess != result && SkCodec::kIncompleteInput != result) {
+                            return SkStringPrintf("%s failed with error message %d",
+                                                  fPath.c_str(), (int) result);
+                        }
+                    }
+                    break;
+                }
+            }
+
             switch (result) {
                 case SkCodec::kSuccess:
                 case SkCodec::kIncompleteInput:
                     break;
                 default:
                     return SkStringPrintf("%s failed with error message %d",
                                           fPath.c_str(), (int) result);
             }
             canvas->drawBitmap(bitmap, 0, 0);
             break;
@@ skipping 875 matching lines @@
             skr.visit<void>(i, drawsAsSingletonPictures);
         }
         SkAutoTUnref<SkPicture> macroPic(macroRec.endRecordingAsPicture());
 
         canvas->drawPicture(macroPic);
         return "";
     });
 }
 
 }  // namespace DM