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 |
new file mode 100644 |
index 0000000000000000000000000000000000000000..15aa86b1e61e273f8db7e37b2ffc20fc05a1ecea |
--- /dev/null |
+++ b/third_party/WebKit/Source/platform/image-decoders/png/PNGImageReader.h |
@@ -0,0 +1,126 @@ |
+/* |
+ * 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 FastSharedBufferReader; |
+ |
+class PLATFORM_EXPORT PNGImageReader final { |
+ USING_FAST_MALLOC(PNGImageReader); |
+ WTF_MAKE_NONCOPYABLE(PNGImageReader); |
+public: |
+ PNGImageReader(PNGImageDecoder*, size_t readOffset); |
+ ~PNGImageReader(); |
+ |
+ struct FrameInfo { |
+ size_t readOffset; |
+ size_t byteLength; |
+ size_t duration; |
+ IntPoint offset; |
scroggo_chromium
2016/10/11 20:13:11
Why not combine offset and size into an IntRect?
|
+ IntSize size; |
+ ImageFrame::DisposalMethod disposalMethod; |
+ ImageFrame::AlphaBlendSource alphaBlend; |
+ }; |
+ |
+ /* |
+ * This method tries to parse the data stream in the SegmentReader, up to |
+ * the point where the PNGParseQuery can be answered. It returns true when |
scroggo_chromium
2016/10/11 20:13:11
I think some better formatting will make this easi
|
+ * the query is fulfilled. It returns false when 1) there is not enough data |
+ * provided, or 2) when the data processing by libpng fails. In the case of |
+ * 2), it also calls setFailed() at the m_decoder. |
scroggo_chromium
2016/10/11 20:13:11
nit: "on m_decoder"
|
+ */ |
+ bool parse(SegmentReader&, PNGImageDecoder::PNGParseQuery); |
+ |
+ void decode(SegmentReader&, size_t); |
+ const FrameInfo& frameInfo(size_t) const; |
+ |
+ /* |
+ * This will return the number of frames that have been detected in the |
+ * stream so far. If an incomplete stream is provided, this number is not |
+ * final. However, all frame info for the frames up to this number is |
+ * available so it can be used by the client if it wants to. |
+ */ |
+ size_t frameCount() const; |
+ |
+ // This is a callback for libpng, when it encounters an unknown chunk. |
+ void parseAnimationChunk(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; } |
+ 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; |
+ bool m_hasAlpha; |
+ bool m_idatPartOfAnimation; |
scroggo_chromium
2016/10/11 20:13:11
nit: I think this is more clear if you insert the
|
+ bool m_parsedSignature; |
+ std::unique_ptr<png_byte[]> m_interlaceBuffer; |
+ |
+ Vector<FrameInfo, 1> m_frameInfo; |
+ FrameInfo m_newFrame; |
+ |
+ // Before using this method, see the remarks at the definition. |
+ png_byte* readAsPngBytep(const FastSharedBufferReader&, size_t offset, size_t length); |
+ char m_readBuffer[26]; |
+ |
+ bool processData(SegmentReader&, size_t offset, size_t length); |
+ bool parseSize(SegmentReader&); |
+ void parseAnimationControl(const png_byte* data); |
+ void parseFrameInfo(const png_byte* data); |
+ |
+#if USE(QCMSLIB) |
+ std::unique_ptr<png_byte[]> m_rowBuffer; |
+#endif |
+}; |
+ |
+}; |
+ |
+#endif |