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| 1 // Copyright (c) 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef SegmentStream_h |
| 6 #define SegmentStream_h |
| 7 |
| 8 #include <algorithm> |
| 9 #include "platform/image-decoders/SegmentReader.h" |
| 10 #include "platform/wtf/RefPtr.h" |
| 11 #include "third_party/skia/include/core/SkStream.h" |
| 12 |
| 13 namespace blink { |
| 14 |
| 15 class PLATFORM_EXPORT SegmentStream : public SkStream { |
| 16 public: |
| 17 SegmentStream(); |
| 18 SegmentStream(SegmentStream&& rhs); |
| 19 virtual ~SegmentStream() {} |
| 20 |
| 21 SegmentStream& operator=(SegmentStream&& rhs); |
| 22 |
| 23 void SetReader(WTF::PassRefPtr<SegmentReader>); |
| 24 bool IsCleared() const { return is_cleared_; } |
| 25 |
| 26 // From SkStream: |
| 27 size_t read(void* buffer, size_t) override; |
| 28 size_t peek(void* buffer, size_t) const override; |
| 29 bool isAtEnd() const override { return has_read_all_contents_; } |
| 30 bool rewind() override; |
| 31 bool hasPosition() const override { return true; } |
| 32 size_t getPosition() const override { return position_; } |
| 33 bool seek(size_t position) override; |
| 34 bool move(long offset) override; |
| 35 bool hasLength() const override { return true; } |
| 36 size_t getLength() const override { |
| 37 if (reader_) |
| 38 return reader_->size(); |
| 39 |
| 40 return 0; |
| 41 } |
| 42 |
| 43 private: |
| 44 void SetPositionState(size_t new_position); |
| 45 |
| 46 WTF::RefPtr<SegmentReader> reader_; |
| 47 size_t position_; |
| 48 bool has_read_all_contents_; |
| 49 bool is_cleared_; |
| 50 }; |
| 51 |
| 52 } // namespace blink |
| 53 |
| 54 #endif |
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