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