blob: 86761c170f02f8b94b53d86d89c98af10600e55b [file] [log] [blame]
/*
* 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 "webrtc/modules/desktop_capture/screen_capturer_helper.h"
#include <assert.h>
#include <algorithm>
#include "webrtc/system_wrappers/interface/logging.h"
namespace webrtc {
ScreenCapturerHelper::ScreenCapturerHelper()
: invalid_region_lock_(RWLockWrapper::CreateRWLock()),
log_grid_size_(0) {
}
ScreenCapturerHelper::~ScreenCapturerHelper() {
}
void ScreenCapturerHelper::ClearInvalidRegion() {
WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
invalid_region_.Clear();
}
void ScreenCapturerHelper::InvalidateRegion(
const DesktopRegion& invalid_region) {
WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
invalid_region_.AddRegion(invalid_region);
}
void ScreenCapturerHelper::InvalidateScreen(const DesktopSize& size) {
WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
invalid_region_.AddRect(DesktopRect::MakeSize(size));
}
void ScreenCapturerHelper::TakeInvalidRegion(
DesktopRegion* invalid_region) {
invalid_region->Clear();
{
WriteLockScoped scoped_invalid_region_lock(*invalid_region_lock_);
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) {
assert(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