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116 lines
4.6 KiB
C++
116 lines
4.6 KiB
C++
/*
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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* Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_PLATFORM_SHAREDBUFFER_H_
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#define SKY_ENGINE_PLATFORM_SHAREDBUFFER_H_
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#include "flutter/sky/engine/platform/PlatformExport.h"
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#include "flutter/sky/engine/platform/PurgeableVector.h"
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#include "flutter/sky/engine/wtf/Forward.h"
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#include "flutter/sky/engine/wtf/OwnPtr.h"
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#include "flutter/sky/engine/wtf/RefCounted.h"
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#include "flutter/sky/engine/wtf/text/WTFString.h"
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#include "third_party/skia/include/core/SkData.h"
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namespace blink {
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class PLATFORM_EXPORT SharedBuffer : public RefCounted<SharedBuffer> {
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public:
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static PassRefPtr<SharedBuffer> create() { return adoptRef(new SharedBuffer); }
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static PassRefPtr<SharedBuffer> create(size_t size) { return adoptRef(new SharedBuffer(size)); }
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static PassRefPtr<SharedBuffer> create(const char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
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static PassRefPtr<SharedBuffer> create(const unsigned char* c, int i) { return adoptRef(new SharedBuffer(c, i)); }
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static PassRefPtr<SharedBuffer> createPurgeable(const char* c, int i) { return adoptRef(new SharedBuffer(c, i, PurgeableVector::Purgeable)); }
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static PassRefPtr<SharedBuffer> adoptVector(Vector<char>&);
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~SharedBuffer();
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// Calling this function will force internal segmented buffers to be merged
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// into a flat buffer. Use getSomeData() whenever possible for better
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// performance.
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const char* data() const;
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unsigned size() const;
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bool isEmpty() const { return !size(); }
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void append(PassRefPtr<SharedBuffer>);
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void append(const char*, unsigned);
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void append(const Vector<char>&);
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void clear();
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PassRefPtr<SharedBuffer> copy() const;
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// Return the number of consecutive bytes after "position". "data"
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// points to the first byte.
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// Return 0 when no more data left.
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// When extracting all data with getSomeData(), the caller should
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// repeat calling it until it returns 0.
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// Usage:
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// const char* segment;
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// unsigned pos = 0;
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// while (unsigned length = sharedBuffer->getSomeData(segment, pos)) {
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// // Use the data. for example: decoder->decode(segment, length);
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// pos += length;
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// }
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unsigned getSomeData(const char*& data, unsigned position = 0) const;
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// Creates an SkData and copies this SharedBuffer's contents to that
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// SkData without merging segmented buffers into a flat buffer.
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sk_sp<SkData> getAsSkData() const;
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// See PurgeableVector::lock().
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bool lock();
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// WARNING: Calling unlock() on a SharedBuffer that wasn't created with the
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// purgeability option does an extra memcpy(). Please use
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// SharedBuffer::createPurgeable() if you intend to call unlock().
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void unlock();
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bool isLocked() const;
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private:
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SharedBuffer();
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explicit SharedBuffer(size_t);
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SharedBuffer(const char*, int);
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SharedBuffer(const char*, int, PurgeableVector::PurgeableOption);
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SharedBuffer(const unsigned char*, int);
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// See SharedBuffer::data().
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void mergeSegmentsIntoBuffer() const;
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unsigned m_size;
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mutable PurgeableVector m_buffer;
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mutable Vector<char*> m_segments;
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};
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_SHAREDBUFFER_H_
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