Scanline decoding for gifs

dm/DMSrcSink.cpp

Index: dm/DMSrcSink.cpp
diff --git a/dm/DMSrcSink.cpp b/dm/DMSrcSink.cpp
index e31a249f70bcbf58eb340c7de3719c3b87e738f3..981e47d6c0bf84690c25c8a49392fa2e3abadc18 100644
--- a/dm/DMSrcSink.cpp
+++ b/dm/DMSrcSink.cpp
@@ -352,8 +352,28 @@ Error CodecSrc::draw(SkCanvas* canvas) const {
                 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: