Implement Fill() for incomplete decodes to RGBA_F16

src/codec/SkPngCodec.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 "SkBitmap.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 881 matching lines @@
     this->allocateStorage(dstInfo);
     int count = this->readRows(dstInfo, dst, rowBytes, dstInfo.height(), 0);
     if (count > dstInfo.height()) {
         *rowsDecoded = count;
         return kIncompleteInput;
     }
 
     return kSuccess;
 }
 
-uint32_t SkPngCodec::onGetFillValue(SkColorType colorType) const {
+uint64_t SkPngCodec::onGetFillValue(const SkImageInfo& dstInfo) const {
     const SkPMColor* colorPtr = get_color_ptr(fColorTable.get());
     if (colorPtr) {
-        return get_color_table_fill_value(colorType, colorPtr, 0);
+        SkAlphaType alphaType = select_alpha_xform(dstInfo.alphaType(),
+                                                   this->getInfo().alphaType());
+        return get_color_table_fill_value(dstInfo.colorType(), alphaType, colorPtr, 0,
+                                          fColorXform.get());
     }
-    return INHERITED::onGetFillValue(colorType);
+    return INHERITED::onGetFillValue(dstInfo);
 }
 
 SkCodec* SkPngCodec::NewFromStream(SkStream* stream, SkPngChunkReader* chunkReader) {
     SkAutoTDelete<SkStream> streamDeleter(stream);
 
     SkCodec* outCodec;
     if (read_header(stream, chunkReader, &outCodec, nullptr, nullptr)) {
         // Codec has taken ownership of the stream.
         SkASSERT(outCodec);
         streamDeleter.release();
         return outCodec;
     }
 
     return nullptr;
 }