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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/codec/video_encoder_active_map.h"
#include <algorithm>
#include <utility>
#include "base/containers/heap_array.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
using DesktopRegionIterator = webrtc::DesktopRegion::Iterator;
namespace {
// Defines the dimension of a macro block. This is used to compute the active
// map for an encoder. This size is the same for VP8, VP9, and AV1 encoders.
constexpr int kMacroBlockSize = 16;
} // namespace
namespace remoting {
VideoEncoderActiveMap::VideoEncoderActiveMap() = default;
VideoEncoderActiveMap::~VideoEncoderActiveMap() = default;
void VideoEncoderActiveMap::Initialize(const webrtc::DesktopSize& size) {
active_map_size_.set((size.width() + kMacroBlockSize - 1) / kMacroBlockSize,
(size.height() + kMacroBlockSize - 1) / kMacroBlockSize);
active_map_ = base::HeapArray<uint8_t>::Uninit(active_map_size_.width() *
active_map_size_.height());
Clear();
}
void VideoEncoderActiveMap::Clear() {
std::ranges::fill(active_map_, 0);
}
void VideoEncoderActiveMap::Update(
const webrtc::DesktopRegion& updated_region) {
if (active_map_.empty()) {
return;
}
const int map_width = active_map_size_.width();
const int map_height = active_map_size_.height();
for (DesktopRegionIterator r(updated_region); !r.IsAtEnd(); r.Advance()) {
const webrtc::DesktopRect& rect = r.rect();
const int left =
std::clamp(rect.left() / kMacroBlockSize, 0, map_width - 1);
const int right =
std::clamp((rect.right() - 1) / kMacroBlockSize, 0, map_width - 1);
const int top = std::clamp(rect.top() / kMacroBlockSize, 0, map_height - 1);
const int bottom =
std::clamp((rect.bottom() - 1) / kMacroBlockSize, 0, map_height - 1);
for (int y = top; y <= bottom; ++y) {
const size_t row_offset = static_cast<size_t>(y) * map_width;
for (int x = left; x <= right; ++x) {
active_map_[row_offset + x] = 1;
}
}
}
}
} // namespace remoting
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