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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_
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