x_server_pixel_buffer.h

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/*

 *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

*/

// Don't include this file in any .h files because it pulls in some X headers.

#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_X_SERVER_PIXEL_BUFFER_H_

#define MODULES_DESKTOP_CAPTURE_LINUX_X11_X_SERVER_PIXEL_BUFFER_H_

#include <X11/Xutil.h>

#include <X11/extensions/XShm.h>

#include <memory>

#include <vector>

#include "modules/desktop_capture/desktop_geometry.h"

namespace webrtc {

class DesktopFrame;

class XAtomCache;

// A class to allow the X server's pixel buffer to be accessed as efficiently

// as possible.

class XServerPixelBuffer {

 public:

  XServerPixelBuffer();

  ~XServerPixelBuffer();

  XServerPixelBuffer(const XServerPixelBuffer&) = delete;

  XServerPixelBuffer& operator=(const XServerPixelBuffer&) = delete;

  void Release();

  // Allocate (or reallocate) the pixel buffer for `window`. Returns false in

  // case of an error (e.g. window doesn't exist).

  bool Init(XAtomCache* cache, Window window);

  bool is_initialized() { return window_ != 0; }

  // Returns the size of the window the buffer was initialized for.

  DesktopSize window_size() { return window_rect_.size(); }

  // Returns the rectangle of the window the buffer was initialized for.

  const DesktopRect& window_rect() { return window_rect_; }

  // Returns true if the window can be found.

  bool IsWindowValid() const;

  // If shared memory is being used without pixmaps, synchronize this pixel

  // buffer with the root window contents (otherwise, this is a no-op).

  // This is to avoid doing a full-screen capture for each individual

  // rectangle in the capture list, when it only needs to be done once at the

  // beginning.

  void Synchronize();

  // Capture the specified rectangle and stores it in the `frame`. In the case

  // where the full-screen data is captured by Synchronize(), this simply

  // returns the pointer without doing any more work. The caller must ensure

  // that `rect` is not larger than window_size().

  bool CaptureRect(const DesktopRect& rect, DesktopFrame* frame);

 private:

  void ReleaseSharedMemorySegment();

  void InitShm(const XWindowAttributes& attributes);

  bool InitPixmaps(int depth);

  Display* display_ = nullptr;

  Window window_ = 0;

  DesktopRect window_rect_;

  XImage* x_image_ = nullptr;

  XShmSegmentInfo* shm_segment_info_ = nullptr;

  XImage* x_shm_image_ = nullptr;

  Pixmap shm_pixmap_ = 0;

  GC shm_gc_ = nullptr;

  bool xshm_get_image_succeeded_ = false;

  std::vector<uint8_t> icc_profile_;

};

}  // namespace webrtc

#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_X_SERVER_PIXEL_BUFFER_H_