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// Copyright (c) 2012 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.
// Don't include this file in any .h files because it pulls in some X headers.
#ifndef REMOTING_HOST_X_SERVER_PIXEL_BUFFER_H_
#define REMOTING_HOST_X_SERVER_PIXEL_BUFFER_H_
#include "base/basictypes.h"
#include "third_party/skia/include/core/SkRect.h"
#include <X11/Xutil.h>
#include <X11/extensions/XShm.h>
namespace remoting {
// A class to allow the X server's pixel buffer to be accessed as efficiently
// as possible.
class XServerPixelBuffer {
public:
XServerPixelBuffer();
~XServerPixelBuffer();
void Release();
void Init(Display* display);
// 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 return a pointer to its top-left pixel
// or NULL if capture fails. The returned pointer remains valid until the next
// call to CaptureRect.
// In the case where the full-screen data is captured by Synchronize(), this
// simply returns the pointer without doing any more work.
uint8* CaptureRect(const SkIRect& rect);
// Return information about the most recent capture. This is only guaranteed
// to be valid between CaptureRect calls.
int GetStride() const;
int GetDepth() const;
int GetBitsPerPixel() const;
int GetRedMask() const;
int GetBlueMask() const;
int GetGreenMask() const;
int GetRedShift() const;
int GetBlueShift() const;
int GetGreenShift() const;
bool IsRgb() const;
private:
void InitShm(int screen);
bool InitPixmaps(int width, int height, int depth);
Display* display_;
Window root_window_;
XImage* x_image_;
XShmSegmentInfo* shm_segment_info_;
Pixmap shm_pixmap_;
GC shm_gc_;
DISALLOW_COPY_AND_ASSIGN(XServerPixelBuffer);
};
} // namespace remoting
#endif // REMOTING_HOST_X_SERVER_PIXEL_BUFFER_H_
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