Add support for drawing video onto a Java ByteBuffer

remoting/client/jni/jni_frame_consumer.h

+// Copyright 2013 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 REMOTING_CLIENT_JNI_JNI_FRAME_CONSUMER_H_
+#define REMOTING_CLIENT_JNI_JNI_FRAME_CONSUMER_H_
+
+#include "remoting/client/frame_consumer.h"
+
+#include "base/compiler_specific.h"
+
+namespace webrtc {
+class DesktopFrame;
+}  // namespace webrtc
+
+namespace remoting {
+class ChromotingJni;
+class FrameProducer;
+
+// FrameConsumer implementation that draws onto a JNI direct byte buffer.
+class JniFrameConsumer : public FrameConsumer {
+ public:
+  JniFrameConsumer();
+  virtual ~JniFrameConsumer();
+
+  // This must be called once before the producer's source size is set.
+  void set_frame_producer(FrameProducer* producer);
+
+  // FrameConsumer implementation.
+  virtual void ApplyBuffer(const SkISize& view_size,
+                           const SkIRect& clip_area,
+                           webrtc::DesktopFrame* buffer,
+                           const SkRegion& region) OVERRIDE;
+  virtual void ReturnBuffer(webrtc::DesktopFrame* buffer) OVERRIDE;
+  virtual void SetSourceSize(const SkISize& source_size,
+                             const SkIPoint& dpi) OVERRIDE;
+
+ private:
+  // Variables are to be used from the display thread.
+
+  // Whether to allocate/provide the producer with a buffer when able. This
+  // goes to false during destruction so that we don't leak memory.
+  bool provide_buffer_;
+
+  FrameProducer* frame_producer_;
+  SkISize view_size_;
+  SkIRect clip_area_;
+
+  // If |provide_buffer_|, allocates a new buffer of |view_size_|, informs
+  // Java about it, and tells the producer to draw onto it. Otherwise, no-op.
+  void AllocateBuffer();
+
+  DISALLOW_COPY_AND_ASSIGN(JniFrameConsumer);
+};
+
+}  // namespace remoting
+
+#endif