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// Copyright (c) 2011 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_HOST_CAPTURER_GDI_H_
#define REMOTING_HOST_CAPTURER_GDI_H_
#include <windows.h>
typedef HBITMAP BitmapRef;
#include "base/memory/scoped_ptr.h"
#include "remoting/host/capturer.h"
#include "remoting/host/capturer_helper.h"
namespace remoting {
class Differ;
// CapturerGdi captures 32bit RGB using GDI.
//
// CapturerGdi is double-buffered as required by Capturer. See
// remoting/host/capturer.h.
class CapturerGdi : public Capturer {
public:
CapturerGdi();
virtual ~CapturerGdi();
// Capturer interface.
virtual void ScreenConfigurationChanged();
virtual media::VideoFrame::Format pixel_format() const;
virtual void ClearInvalidRects();
virtual void InvalidateRects(const InvalidRects& inval_rects);
virtual void InvalidateScreen(const gfx::Size& size);
virtual void InvalidateFullScreen();
virtual void CaptureInvalidRects(CaptureCompletedCallback* callback);
virtual const gfx::Size& size_most_recent() const;
private:
struct VideoFrameBuffer {
VideoFrameBuffer(void* data, const gfx::Size& size, int bytes_per_pixel,
int bytes_per_row)
: data(data), size(size), bytes_per_pixel(bytes_per_pixel),
bytes_per_row(bytes_per_row) {
}
VideoFrameBuffer() {
data = 0;
size = gfx::Size(0, 0);
bytes_per_pixel = 0;
bytes_per_row = 0;
}
void* data;
gfx::Size size;
int bytes_per_pixel;
int bytes_per_row;
};
// Make sure that the current buffer has the same size as the screen.
void UpdateBufferCapture(const gfx::Size& size);
// Allocate memory for a buffer of a given size, freeing any memory previously
// allocated for that buffer.
void ReallocateBuffer(int buffer_index, const gfx::Size& size);
void CalculateInvalidRects();
void CaptureRects(const InvalidRects& rects,
CaptureCompletedCallback* callback);
void ReleaseBuffers();
// Generates an image in the current buffer.
void CaptureImage();
// Gets the current screen size and calls ScreenConfigurationChanged
// if the screen size has changed.
void MaybeChangeScreenConfiguration();
// Gets the screen size.
gfx::Size GetScreenSize();
// A thread-safe list of invalid rectangles, and the size of the most
// recently captured screen.
CapturerHelper helper;
// There are two buffers for the screen images, as required by Capturer.
static const int kNumBuffers = 2;
VideoFrameBuffer buffers_[kNumBuffers];
// Gdi specific information about screen.
HDC desktop_dc_;
HDC memory_dc_;
HBITMAP target_bitmap_[kNumBuffers];
// The screen size attached to the device contexts through which the screen
// is captured.
gfx::Size dc_size_;
// The current buffer with valid data for reading.
int current_buffer_;
// Format of pixels returned in buffer.
media::VideoFrame::Format pixel_format_;
// Class to calculate the difference between two screen bitmaps.
scoped_ptr<Differ> differ_;
// True if we should force a fullscreen capture.
bool capture_fullscreen_;
DISALLOW_COPY_AND_ASSIGN(CapturerGdi);
};
} // namespace remoting
#endif // REMOTING_HOST_CAPTURER_GDI_H_
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