Index: third_party/WebKit/Source/platform/image-decoders/SegmentStream.h |
diff --git a/third_party/WebKit/Source/platform/image-decoders/SegmentStream.h b/third_party/WebKit/Source/platform/image-decoders/SegmentStream.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..37359e64b9474f5d1392661c668c050d0de972e0 |
--- /dev/null |
+++ b/third_party/WebKit/Source/platform/image-decoders/SegmentStream.h |
@@ -0,0 +1,51 @@ |
+// Copyright (c) 2017 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef SegmentStream_h |
+#define SegmentStream_h |
+ |
+#include <algorithm> |
+#include "platform/PlatformExport.h" |
+#include "platform/wtf/RefPtr.h" |
+#include "third_party/skia/include/core/SkStream.h" |
+ |
+namespace blink { |
+ |
+class SegmentReader; |
+ |
+class PLATFORM_EXPORT SegmentStream : public SkStream { |
+ public: |
+ SegmentStream(); |
+ SegmentStream(const SegmentStream&) = delete; |
+ SegmentStream& operator=(const SegmentStream&) = delete; |
+ SegmentStream(SegmentStream&&); |
+ SegmentStream& operator=(SegmentStream&&); |
+ |
+ ~SegmentStream() override; |
+ |
+ void SetReader(WTF::RefPtr<SegmentReader>); |
+ // If a buffer has shrunk beyond the point we have read, it has been cleared. |
+ // This allows clients to be aware of when data suddenly disappears. |
+ bool IsCleared() const; |
+ |
+ // From SkStream: |
+ size_t read(void* buffer, size_t) override; |
+ size_t peek(void* buffer, size_t) const override; |
+ bool isAtEnd() const override; |
+ bool rewind() override; |
+ bool hasPosition() const override { return true; } |
+ size_t getPosition() const override { return position_; } |
+ bool seek(size_t position) override; |
+ bool move(long offset) override; |
+ bool hasLength() const override { return true; } |
+ size_t getLength() const override; |
+ |
+ private: |
+ WTF::RefPtr<SegmentReader> reader_; |
+ size_t position_ = 0; |
+}; |
+ |
+} // namespace blink |
+ |
+#endif |