Blink image-decoders: (lazy) deferred image decoding support for ICO

third_party/WebKit/Source/platform/image-decoders/ico/ICOImageDecoder.h

 /*
  * Copyright (c) 2008, 2009, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 32 matching lines @@
 public:
     ICOImageDecoder(AlphaOption, GammaAndColorProfileOption, size_t maxDecodedBytes);
     ~ICOImageDecoder() override;
 
     // ImageDecoder:
     String filenameExtension() const override { return "ico"; }
     void onSetData(SegmentReader*) override;
     IntSize size() const override;
     IntSize frameSizeAtIndex(size_t) const override;
     bool setSize(unsigned width, unsigned height) override;
+    bool frameIsCompleteAtIndex(size_t) const override;
     // CAUTION: setFailed() deletes all readers and decoders.  Be careful to
     // avoid accessing deleted memory, especially when calling this from
     // inside BMPImageReader!
     bool setFailed() override;
     bool hotSpot(IntPoint&) const override;
 
 private:
     enum ImageType {
         Unknown,
         BMP,
         PNG,
     };
 
     enum FileType {
         ICON = 1,
         CURSOR = 2,
     };
 
     struct IconDirectoryEntry {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
         IntSize m_size;
         uint16_t m_bitCount;
         IntPoint m_hotSpot;
         uint32_t m_imageOffset;
+        uint32_t m_byteSize;
     };
 
     // Returns true if |a| is a preferable icon entry to |b|.
     // Larger sizes, or greater bitdepths at the same size, are preferable.
     static bool compareEntries(const IconDirectoryEntry& a, const IconDirectoryEntry& b);
 
     // ImageDecoder:
     virtual void decodeSize() { decode(0, true); }
     size_t decodeFrameCount() override;
     void decode(size_t index) override { decode(index, false); }
@@ skipping 76 matching lines @@
     PNGDecoders m_pngDecoders;
 
     // Valid only while a BMPImageReader is decoding, this holds the size
     // for the particular entry being decoded.
     IntSize m_frameSize;
 };
 
 } // namespace blink
 
 #endif