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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // Don't include this file in any .h files because it pulls in some X headers. | |
6 | |
7 #ifndef REMOTING_CAPTURER_LINUX_X_SERVER_PIXEL_BUFFER_H_ | |
8 #define REMOTING_CAPTURER_LINUX_X_SERVER_PIXEL_BUFFER_H_ | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "third_party/skia/include/core/SkRect.h" | |
12 | |
13 #include <X11/Xutil.h> | |
14 #include <X11/extensions/XShm.h> | |
15 | |
16 namespace remoting { | |
17 | |
18 // A class to allow the X server's pixel buffer to be accessed as efficiently | |
19 // as possible. | |
20 class XServerPixelBuffer { | |
21 public: | |
22 XServerPixelBuffer(); | |
23 ~XServerPixelBuffer(); | |
24 | |
25 void Release(); | |
26 | |
27 // Allocate (or reallocate) the pixel buffer with the given size, which is | |
28 // assumed to be the current size of the root window. | |
29 // |screen_size| should either come from GetRootWindowSize(), or | |
30 // from a recent ConfigureNotify event on the root window. | |
31 void Init(Display* display, const SkISize& screen_size); | |
32 | |
33 // Request the current size of the root window from the X Server. | |
34 static SkISize GetRootWindowSize(Display* display); | |
35 | |
36 // If shared memory is being used without pixmaps, synchronize this pixel | |
37 // buffer with the root window contents (otherwise, this is a no-op). | |
38 // This is to avoid doing a full-screen capture for each individual | |
39 // rectangle in the capture list, when it only needs to be done once at the | |
40 // beginning. | |
41 void Synchronize(); | |
42 | |
43 // Capture the specified rectangle and return a pointer to its top-left pixel | |
44 // or NULL if capture fails. The returned pointer remains valid until the next | |
45 // call to CaptureRect. | |
46 // In the case where the full-screen data is captured by Synchronize(), this | |
47 // simply returns the pointer without doing any more work. | |
48 // The caller must ensure that |rect| is no larger than the screen size | |
49 // supplied to Init(). | |
50 uint8* CaptureRect(const SkIRect& rect); | |
51 | |
52 // Return information about the most recent capture. This is only guaranteed | |
53 // to be valid between CaptureRect calls. | |
54 int GetStride() const; | |
55 int GetDepth() const; | |
56 int GetBitsPerPixel() const; | |
57 int GetRedMask() const; | |
58 int GetBlueMask() const; | |
59 int GetGreenMask() const; | |
60 int GetRedShift() const; | |
61 int GetBlueShift() const; | |
62 int GetGreenShift() const; | |
63 bool IsRgb() const; | |
64 | |
65 private: | |
66 void InitShm(int screen); | |
67 bool InitPixmaps(int depth); | |
68 | |
69 Display* display_; | |
70 Window root_window_; | |
71 SkISize root_window_size_; | |
72 XImage* x_image_; | |
73 XShmSegmentInfo* shm_segment_info_; | |
74 Pixmap shm_pixmap_; | |
75 GC shm_gc_; | |
76 | |
77 DISALLOW_COPY_AND_ASSIGN(XServerPixelBuffer); | |
78 }; | |
79 | |
80 } // namespace remoting | |
81 | |
82 #endif // REMOTING_CAPTURER_LINUX_X_SERVER_PIXEL_BUFFER_H_ | |
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