97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
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/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/desktop_capture/screen_capturer_helper.h"
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#include <assert.h>
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namespace webrtc {
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ScreenCapturerHelper::ScreenCapturerHelper()
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: invalid_region_lock_(RWLockWrapper::CreateRWLock()), log_grid_size_(0) {}
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ScreenCapturerHelper::~ScreenCapturerHelper() {}
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void ScreenCapturerHelper::ClearInvalidRegion() {
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WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
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invalid_region_.Clear();
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}
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void ScreenCapturerHelper::InvalidateRegion(
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const DesktopRegion& invalid_region) {
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WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
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invalid_region_.AddRegion(invalid_region);
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}
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void ScreenCapturerHelper::InvalidateScreen(const DesktopSize& size) {
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WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
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invalid_region_.AddRect(DesktopRect::MakeSize(size));
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}
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void ScreenCapturerHelper::TakeInvalidRegion(DesktopRegion* invalid_region) {
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invalid_region->Clear();
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{
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WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
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invalid_region->Swap(&invalid_region_);
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}
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if (log_grid_size_ > 0) {
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DesktopRegion expanded_region;
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ExpandToGrid(*invalid_region, log_grid_size_, &expanded_region);
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expanded_region.Swap(invalid_region);
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invalid_region->IntersectWith(DesktopRect::MakeSize(size_most_recent_));
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}
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}
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void ScreenCapturerHelper::SetLogGridSize(int log_grid_size) {
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log_grid_size_ = log_grid_size;
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}
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const DesktopSize& ScreenCapturerHelper::size_most_recent() const {
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return size_most_recent_;
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}
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void ScreenCapturerHelper::set_size_most_recent(const DesktopSize& size) {
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size_most_recent_ = size;
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}
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// Returns the largest multiple of |n| that is <= |x|.
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// |n| must be a power of 2. |nMask| is ~(|n| - 1).
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static int DownToMultiple(int x, int nMask) {
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return (x & nMask);
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}
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// Returns the smallest multiple of |n| that is >= |x|.
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// |n| must be a power of 2. |nMask| is ~(|n| - 1).
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static int UpToMultiple(int x, int n, int nMask) {
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return ((x + n - 1) & nMask);
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}
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void ScreenCapturerHelper::ExpandToGrid(const DesktopRegion& region,
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int log_grid_size,
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DesktopRegion* result) {
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assert(log_grid_size >= 1);
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int grid_size = 1 << log_grid_size;
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int grid_size_mask = ~(grid_size - 1);
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result->Clear();
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for (DesktopRegion::Iterator it(region); !it.IsAtEnd(); it.Advance()) {
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int left = DownToMultiple(it.rect().left(), grid_size_mask);
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int right = UpToMultiple(it.rect().right(), grid_size, grid_size_mask);
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int top = DownToMultiple(it.rect().top(), grid_size_mask);
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int bottom = UpToMultiple(it.rect().bottom(), grid_size, grid_size_mask);
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result->AddRect(DesktopRect::MakeLTRB(left, top, right, bottom));
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}
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}
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} // namespace webrtc
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