WIP: Implement APNG

third_party/WebKit/Source/platform/image-decoders/png/PNGImageReader.h

Index: third_party/WebKit/Source/platform/image-decoders/png/PNGImageReader.h
diff --git a/third_party/WebKit/Source/platform/image-decoders/png/PNGImageReader.h b/third_party/WebKit/Source/platform/image-decoders/png/PNGImageReader.h
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index 0000000000000000000000000000000000000000..ae421d6f1ae9ce801cc9696da92a03220b075fbc
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+/*
+ * Copyright (C) 2006 Apple Computer, 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "platform/image-decoders/SegmentReader.h"
+#include "platform/image-decoders/png/PNGImageDecoder.h"
+#include "platform/PlatformExport.h"
+#include "png.h"
+#include "wtf/Allocator.h"
+#include "wtf/PtrUtil.h"
+
+#ifndef PNGImageReader_h
+#define PNGImageReader_h
+
+namespace blink {
+
+class PLATFORM_EXPORT PNGImageReader final {
+    USING_FAST_MALLOC(PNGImageReader);
+    WTF_MAKE_NONCOPYABLE(PNGImageReader);
+public:
+    PNGImageReader(PNGImageDecoder*, size_t readOffset);
+    ~PNGImageReader();
+
+    bool parse(const SegmentReader&, PNGImageDecoder::PNGParseQuery);
+    bool readChunk(const char* tag, const void* dataChunk, size_t length);
+
+    png_structp pngPtr() const { return m_png; }
+    png_infop infoPtr() const { return m_info; }
+
+    size_t getReadOffset() const { return m_readOffset; }
+    void setReadOffset(size_t offset) { m_readOffset = offset; }
+    size_t currentBufferSize() const { return m_currentBufferSize; }
+    bool decodingSizeOnly() const { return m_decodingSizeOnly; }
+    void setHasAlpha(bool hasAlpha) { m_hasAlpha = hasAlpha; }
+    bool hasAlpha() const { return m_hasAlpha; }
+
+    png_bytep interlaceBuffer() const { return m_interlaceBuffer.get(); }
+    void createInterlaceBuffer(int size) { m_interlaceBuffer = wrapArrayUnique(new png_byte[size]); }
+#if USE(QCMSLIB)
+    png_bytep rowBuffer() const { return m_rowBuffer.get(); }
+    void createRowBuffer(int size) { m_rowBuffer = wrapArrayUnique(new png_byte[size]); }
+#endif
+
+
+private:
+    png_structp m_png;
+    png_infop m_info;
+    PNGImageDecoder* m_decoder;
+    size_t m_readOffset;
+    size_t m_currentBufferSize;
+    bool m_decodingSizeOnly;
+    bool m_hasAlpha;
+    std::unique_ptr<png_byte[]> m_interlaceBuffer;
+
+    inline bool readAnimationControl(const png_byte* data);
+
+#if USE(QCMSLIB)
+    std::unique_ptr<png_byte[]> m_rowBuffer;
+#endif
+};
+
+};
+
+#endif