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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_ | 5 #ifndef MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_ |
6 #define MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_ | 6 #define MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_ |
7 | 7 |
8 #include <vector> | 8 #include <vector> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
11 #include "base/memory/scoped_ptr.h" | 11 #include "base/memory/scoped_ptr.h" |
12 #include "media/base/media_export.h" | 12 #include "media/base/media_export.h" |
13 #include "third_party/skia/include/core/SkRegion.h" | 13 #include "third_party/webrtc/modules/desktop_capture/desktop_region.h" |
14 | 14 |
15 namespace media { | 15 namespace media { |
16 | 16 |
17 typedef uint8 DiffInfo; | 17 typedef uint8 DiffInfo; |
18 | 18 |
19 // TODO: Simplify differ now that we are working with SkRegions. | 19 // TODO: Simplify differ now that we are working with webrtc::DesktopRegion. |
20 // diff_info_ should no longer be needed, as we can put our data directly into | 20 // diff_info_ should no longer be needed, as we can put our data directly into |
21 // the region that we are calculating. | 21 // the region that we are calculating. |
22 // http://crbug.com/92379 | 22 // http://crbug.com/92379 |
23 // TODO(sergeyu): Rename this class to something more sensible, e.g. | 23 // TODO(sergeyu): Rename this class to something more sensible, e.g. |
24 // ScreenCaptureFrameDifferencer. | 24 // ScreenCaptureFrameDifferencer. |
25 class MEDIA_EXPORT Differ { | 25 class MEDIA_EXPORT Differ { |
26 public: | 26 public: |
27 // Create a differ that operates on bitmaps with the specified width, height | 27 // Create a differ that operates on bitmaps with the specified width, height |
28 // and bytes_per_pixel. | 28 // and bytes_per_pixel. |
29 Differ(int width, int height, int bytes_per_pixel, int stride); | 29 Differ(int width, int height, int bytes_per_pixel, int stride); |
30 ~Differ(); | 30 ~Differ(); |
31 | 31 |
32 int width() { return width_; } | 32 int width() { return width_; } |
33 int height() { return height_; } | 33 int height() { return height_; } |
34 int bytes_per_pixel() { return bytes_per_pixel_; } | 34 int bytes_per_pixel() { return bytes_per_pixel_; } |
35 int bytes_per_row() { return bytes_per_row_; } | 35 int bytes_per_row() { return bytes_per_row_; } |
36 | 36 |
37 // Given the previous and current screen buffer, calculate the dirty region | 37 // Given the previous and current screen buffer, calculate the dirty region |
38 // that encloses all of the changed pixels in the new screen. | 38 // that encloses all of the changed pixels in the new screen. |
39 void CalcDirtyRegion(const void* prev_buffer, const void* curr_buffer, | 39 void CalcDirtyRegion(const void* prev_buffer, const void* curr_buffer, |
40 SkRegion* region); | 40 webrtc::DesktopRegion* region); |
41 | 41 |
42 private: | 42 private: |
43 // Allow tests to access our private parts. | 43 // Allow tests to access our private parts. |
44 friend class DifferTest; | 44 friend class DifferTest; |
45 | 45 |
46 // Identify all of the blocks that contain changed pixels. | 46 // Identify all of the blocks that contain changed pixels. |
47 void MarkDirtyBlocks(const void* prev_buffer, const void* curr_buffer); | 47 void MarkDirtyBlocks(const void* prev_buffer, const void* curr_buffer); |
48 | 48 |
49 // After the dirty blocks have been identified, this routine merges adjacent | 49 // After the dirty blocks have been identified, this routine merges adjacent |
50 // blocks into a region. | 50 // blocks into a region. |
51 // The goal is to minimize the region that covers the dirty blocks. | 51 // The goal is to minimize the region that covers the dirty blocks. |
52 void MergeBlocks(SkRegion* region); | 52 void MergeBlocks(webrtc::DesktopRegion* region); |
53 | 53 |
54 // Check for diffs in upper-left portion of the block. The size of the portion | 54 // Check for diffs in upper-left portion of the block. The size of the portion |
55 // to check is specified by the |width| and |height| values. | 55 // to check is specified by the |width| and |height| values. |
56 // Note that if we force the capturer to always return images whose width and | 56 // Note that if we force the capturer to always return images whose width and |
57 // height are multiples of kBlockSize, then this will never be called. | 57 // height are multiples of kBlockSize, then this will never be called. |
58 DiffInfo DiffPartialBlock(const uint8* prev_buffer, const uint8* curr_buffer, | 58 DiffInfo DiffPartialBlock(const uint8* prev_buffer, const uint8* curr_buffer, |
59 int stride, int width, int height); | 59 int stride, int width, int height); |
60 | 60 |
61 // Dimensions of screen. | 61 // Dimensions of screen. |
62 int width_; | 62 int width_; |
(...skipping 13 matching lines...) Expand all Loading... |
76 int diff_info_width_; | 76 int diff_info_width_; |
77 int diff_info_height_; | 77 int diff_info_height_; |
78 int diff_info_size_; | 78 int diff_info_size_; |
79 | 79 |
80 DISALLOW_COPY_AND_ASSIGN(Differ); | 80 DISALLOW_COPY_AND_ASSIGN(Differ); |
81 }; | 81 }; |
82 | 82 |
83 } // namespace media | 83 } // namespace media |
84 | 84 |
85 #endif // MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_ | 85 #endif // MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_H_ |
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