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Side by Side Diff: remoting/host/video_frame_capturer_helper.cc

Issue 11470028: Move screen capturers to remoting/capturer. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 8 years ago
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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 #include "remoting/host/video_frame_capturer_helper.h"
6
7 #include <algorithm>
8
9 #include "base/logging.h"
10 #include "base/memory/scoped_ptr.h"
11
12 namespace remoting {
13
14 VideoFrameCapturerHelper::VideoFrameCapturerHelper() :
15 size_most_recent_(SkISize::Make(0, 0)),
16 log_grid_size_(0) {
17 }
18
19 VideoFrameCapturerHelper::~VideoFrameCapturerHelper() {
20 }
21
22 void VideoFrameCapturerHelper::ClearInvalidRegion() {
23 base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
24 invalid_region_.setEmpty();
25 }
26
27 void VideoFrameCapturerHelper::InvalidateRegion(
28 const SkRegion& invalid_region) {
29 base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
30 invalid_region_.op(invalid_region, SkRegion::kUnion_Op);
31 }
32
33 void VideoFrameCapturerHelper::InvalidateScreen(const SkISize& size) {
34 base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
35 invalid_region_.op(SkIRect::MakeWH(size.width(), size.height()),
36 SkRegion::kUnion_Op);
37 }
38
39 void VideoFrameCapturerHelper::InvalidateFullScreen() {
40 if (!size_most_recent_.isZero())
41 InvalidateScreen(size_most_recent_);
42 }
43
44 void VideoFrameCapturerHelper::SwapInvalidRegion(SkRegion* invalid_region) {
45 {
46 base::AutoLock auto_invalid_region_lock(invalid_region_lock_);
47 invalid_region->swap(invalid_region_);
48 }
49 if (log_grid_size_ > 0) {
50 scoped_ptr<SkRegion> expanded_region(
51 ExpandToGrid(*invalid_region, log_grid_size_));
52 invalid_region->swap(*expanded_region);
53 invalid_region->op(SkRegion(SkIRect::MakeSize(size_most_recent_)),
54 SkRegion::kIntersect_Op);
55 }
56 }
57
58 void VideoFrameCapturerHelper::SetLogGridSize(int log_grid_size) {
59 log_grid_size_ = log_grid_size;
60 }
61
62 const SkISize& VideoFrameCapturerHelper::size_most_recent() const {
63 return size_most_recent_;
64 }
65
66 void VideoFrameCapturerHelper::set_size_most_recent(const SkISize& size) {
67 size_most_recent_ = size;
68 }
69
70 // Returns the largest multiple of |n| that is <= |x|.
71 // |n| must be a power of 2. |nMask| is ~(|n| - 1).
72 static int DownToMultiple(int x, int nMask) {
73 return (x & nMask);
74 }
75
76 // Returns the smallest multiple of |n| that is >= |x|.
77 // |n| must be a power of 2. |nMask| is ~(|n| - 1).
78 static int UpToMultiple(int x, int n, int nMask) {
79 return ((x + n - 1) & nMask);
80 }
81
82 scoped_ptr<SkRegion> VideoFrameCapturerHelper::ExpandToGrid(
83 const SkRegion& region,
84 int log_grid_size) {
85 DCHECK(log_grid_size >= 1);
86 int grid_size = 1 << log_grid_size;
87 int grid_size_mask = ~(grid_size - 1);
88 // Count the rects in the region.
89 int rectNum = 0;
90 SkRegion::Iterator iter(region);
91 while (!iter.done()) {
92 iter.next();
93 ++rectNum;
94 }
95 // Expand each rect.
96 scoped_array<SkIRect> rects(new SkIRect[rectNum]);
97 iter.rewind();
98 int rectI = 0;
99 while (!iter.done()) {
100 SkIRect rect = iter.rect();
101 iter.next();
102 int left = std::min(rect.left(), rect.right());
103 int right = std::max(rect.left(), rect.right());
104 int top = std::min(rect.top(), rect.bottom());
105 int bottom = std::max(rect.top(), rect.bottom());
106 left = DownToMultiple(left, grid_size_mask);
107 right = UpToMultiple(right, grid_size, grid_size_mask);
108 top = DownToMultiple(top, grid_size_mask);
109 bottom = UpToMultiple(bottom, grid_size, grid_size_mask);
110 rects[rectI++] = SkIRect::MakeLTRB(left, top, right, bottom);
111 }
112 // Make the union of the expanded rects.
113 scoped_ptr<SkRegion> regionNew(new SkRegion());
114 regionNew->setRects(rects.get(), rectNum);
115 return regionNew.Pass();
116 }
117
118 } // namespace remoting
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