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// Copyright 2016 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_DECODERS_SEGMENT_READER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_DECODERS_SEGMENT_READER_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/platform/shared_buffer.h"
#include "third_party/blink/renderer/platform/wtf/noncopyable.h"
#include "third_party/blink/renderer/platform/wtf/thread_safe_ref_counted.h"
class SkData;
class SkROBuffer;
namespace blink {
// Interface that looks like SharedBuffer. Used by ImageDecoders to use various
// sources of input including:
// - SharedBuffer
// - for when the caller already has a SharedBuffer
// - SkData
// - for when the caller already has an SkData
// - SkROBuffer
// - for when the caller wants to read/write in different threads
//
// Unlike SharedBuffer, this is a read-only interface. There is no way to
// modify the underlying data source.
class PLATFORM_EXPORT SegmentReader
: public ThreadSafeRefCounted<SegmentReader> {
WTF_MAKE_NONCOPYABLE(SegmentReader);
public:
// This version is thread-safe so long as no thread is modifying the
// underlying SharedBuffer. This class does not modify it, so that would
// mean modifying it in another way.
static scoped_refptr<SegmentReader> CreateFromSharedBuffer(
scoped_refptr<SharedBuffer>);
// These versions use thread-safe input, so they are always thread-safe.
static scoped_refptr<SegmentReader> CreateFromSkData(sk_sp<SkData>);
static scoped_refptr<SegmentReader> CreateFromSkROBuffer(sk_sp<SkROBuffer>);
SegmentReader() = default;
virtual ~SegmentReader() = default;
virtual size_t size() const = 0;
virtual size_t GetSomeData(const char*& data, size_t position) const = 0;
virtual sk_sp<SkData> GetAsSkData() const = 0;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_IMAGE_DECODERS_SEGMENT_READER_H_
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