Revert of Make SkPngCodec decode progressively.

src/codec/SkIcoCodec.cpp

Index: src/codec/SkIcoCodec.cpp
diff --git a/src/codec/SkIcoCodec.cpp b/src/codec/SkIcoCodec.cpp
index abcf4dc7d2af88e80c7e690adf37c81bd92f7e54..0e81b72407218778b9d469e72b95941149b83309 100644
--- a/src/codec/SkIcoCodec.cpp
+++ b/src/codec/SkIcoCodec.cpp
@@ -186,7 +186,6 @@ SkIcoCodec::SkIcoCodec(int width, int height, const SkEncodedInfo& info,
     : INHERITED(width, height, info, nullptr)
     , fEmbeddedCodecs(codecs)
     , fCurrScanlineCodec(nullptr)
-    , fCurrIncrementalCodec(nullptr)
 {}
 
 /*
@@ -290,7 +289,6 @@ SkCodec::Result SkIcoCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
         result = embeddedCodec->startScanlineDecode(dstInfo, &options, colorTable, colorCount);
         if (kSuccess == result) {
             fCurrScanlineCodec = embeddedCodec;
-            fCurrIncrementalCodec = nullptr;
             return result;
         }
 
@@ -311,82 +309,13 @@ bool SkIcoCodec::onSkipScanlines(int count) {
     return fCurrScanlineCodec->skipScanlines(count);
 }
 
-SkCodec::Result SkIcoCodec::onStartIncrementalDecode(const SkImageInfo& dstInfo,
-        void* pixels, size_t rowBytes, const SkCodec::Options& options,
-        SkPMColor* colorTable, int* colorCount) {
-    int index = 0;
-    while (true) {
-        index = this->chooseCodec(dstInfo.dimensions(), index);
-        if (index < 0) {
-            break;
-        }
-
-        SkCodec* embeddedCodec = fEmbeddedCodecs->operator[](index);
-        switch (embeddedCodec->startIncrementalDecode(dstInfo,
-                pixels, rowBytes, &options, colorTable, colorCount)) {
-            case kSuccess:
-                fCurrIncrementalCodec = embeddedCodec;
-                fCurrScanlineCodec = nullptr;
-                return kSuccess;
-            case kUnimplemented:
-                // FIXME: embeddedCodec is a BMP. If scanline decoding would work,
-                // return kUnimplemented so that SkSampledCodec will fall through
-                // to use the scanline decoder.
-                // Note that calling startScanlineDecode will require an extra
-                // rewind. The embedded codec has an SkMemoryStream, which is
-                // cheap to rewind, though it will do extra work re-reading the
-                // header.
-                // Also note that we pass nullptr for Options. This is because
-                // Options that are valid for incremental decoding may not be
-                // valid for scanline decoding.
-                // Once BMP supports incremental decoding this workaround can go
-                // away.
-                if (embeddedCodec->startScanlineDecode(dstInfo, nullptr,
-                        colorTable, colorCount) == kSuccess) {
-                    return kUnimplemented;
-                }
-                // Move on to the next embedded codec.
-                break;
-            default:
-                break;
-        }
-
-        index++;
-    }
-
-    SkCodecPrintf("Error: No matching candidate image in ico.\n");
-    return kInvalidScale;
-}
-
-SkCodec::Result SkIcoCodec::onIncrementalDecode(int* rowsDecoded) {
-    SkASSERT(fCurrIncrementalCodec);
-    return fCurrIncrementalCodec->incrementalDecode(rowsDecoded);
-}
-
 SkCodec::SkScanlineOrder SkIcoCodec::onGetScanlineOrder() const {
     // FIXME: This function will possibly return the wrong value if it is called
-    //        before startScanlineDecode()/startIncrementalDecode().
-    if (fCurrScanlineCodec) {
-        SkASSERT(!fCurrIncrementalCodec);
-        return fCurrScanlineCodec->getScanlineOrder();
-    }
-
-    if (fCurrIncrementalCodec) {
-        return fCurrIncrementalCodec->getScanlineOrder();
-    }
-
-    return INHERITED::onGetScanlineOrder();
+    //        before startScanlineDecode().
+    return fCurrScanlineCodec ? fCurrScanlineCodec->getScanlineOrder() :
+            INHERITED::onGetScanlineOrder();
 }
 
 SkSampler* SkIcoCodec::getSampler(bool createIfNecessary) {
-    if (fCurrScanlineCodec) {
-        SkASSERT(!fCurrIncrementalCodec);
-        return fCurrScanlineCodec->getSampler(createIfNecessary);
-    }
-
-    if (fCurrIncrementalCodec) {
-        return fCurrIncrementalCodec->getSampler(createIfNecessary);
-    }
-
-    return nullptr;
+    return fCurrScanlineCodec ? fCurrScanlineCodec->getSampler(createIfNecessary) : nullptr;
 }