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..a62fdb282316b490d5dc661334c0e51e5621e21e |
--- /dev/null |
+++ b/third_party/WebKit/Source/platform/image-decoders/SegmentStream.h |
@@ -0,0 +1,61 @@ |
+// 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/image-decoders/SegmentReader.h" |
+#include "platform/wtf/RefPtr.h" |
+#include "third_party/skia/include/core/SkStream.h" |
+ |
+namespace blink { |
+ |
+class PLATFORM_EXPORT SegmentStream : public SkStream { |
+ public: |
+ SegmentStream(); |
+ SegmentStream(SegmentStream&& rhs); |
+ virtual ~SegmentStream() {} |
scroggo_chromium
2017/08/08 19:39:25
Should this instead be:
~SegmentStream() overrid
cblume
2017/08/09 17:29:29
Yes.
On 2017/08/08 19:39:25, scroggo_chromium wr
scroggo_chromium
2017/08/09 17:50:48
Yeah, that code is pretty old. Skia's official sty
|
+ |
+ SegmentStream& operator=(SegmentStream&& rhs); |
+ |
+ void SetReader(WTF::PassRefPtr<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 { return is_cleared_; } |
+ |
+ // From SkStream: |
+ size_t read(void* buffer, size_t) override; |
+ size_t peek(void* buffer, size_t) const override; |
+ bool isAtEnd() const override { return has_read_all_contents_; } |
+ 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 { |
+ if (reader_) |
+ return reader_->size(); |
+ |
+ return 0; |
+ } |
+ |
+ private: |
+ void SetPositionState(size_t new_position); |
+ |
+ WTF::RefPtr<SegmentReader> reader_; |
+ size_t position_ = 0; |
+ // |has_read_all_contents_| indicates if we have read all the contents of the |
+ // buffer. |
+ bool has_read_all_contents_ = true; |
+ // |is_cleared_| tracks if we have shrunk the buffer beyond the point we have |
+ // read. Clients of this class rely on data not disappearing, so we need to |
+ // handle the case when it does. |
+ bool is_cleared_ = true; |
+}; |
+ |
+} // namespace blink |
+ |
+#endif |