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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "remoting/protocol/fake_desktop_capturer.h"
#include <stdint.h>
#include <memory>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/notimplemented.h"
#include "base/task/single_thread_task_runner.h"
#include "base/time/time.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
namespace remoting::protocol {
// FakeDesktopCapturer generates a white picture of size kWidth x kHeight
// with a rectangle of size kBoxWidth x kBoxHeight. The rectangle moves kSpeed
// pixels per frame along both axes, and bounces off the sides of the screen.
static const int kWidth = FakeDesktopCapturer::kWidth;
static const int kHeight = FakeDesktopCapturer::kHeight;
static const int kBoxWidth = 140;
static const int kBoxHeight = 140;
static const int kSpeed = 20;
static_assert(kBoxWidth < kWidth && kBoxHeight < kHeight, "bad box size");
static_assert((kBoxWidth % kSpeed == 0) && (kWidth % kSpeed == 0) &&
(kBoxHeight % kSpeed == 0) && (kHeight % kSpeed == 0),
"sizes must be multiple of kSpeed");
namespace {
class DefaultFrameGenerator
: public base::RefCountedThreadSafe<DefaultFrameGenerator> {
public:
DefaultFrameGenerator()
: box_pos_x_(0),
box_pos_y_(0),
box_speed_x_(kSpeed),
box_speed_y_(kSpeed),
first_frame_(true) {}
DefaultFrameGenerator(const DefaultFrameGenerator&) = delete;
DefaultFrameGenerator& operator=(const DefaultFrameGenerator&) = delete;
std::unique_ptr<webrtc::DesktopFrame> GenerateFrame(
webrtc::SharedMemoryFactory* shared_memory_factory);
private:
friend class base::RefCountedThreadSafe<DefaultFrameGenerator>;
~DefaultFrameGenerator() = default;
webrtc::DesktopSize size_;
int box_pos_x_;
int box_pos_y_;
int box_speed_x_;
int box_speed_y_;
bool first_frame_;
};
std::unique_ptr<webrtc::DesktopFrame> DefaultFrameGenerator::GenerateFrame(
webrtc::SharedMemoryFactory* shared_memory_factory) {
const int kBytesPerPixel = webrtc::DesktopFrame::kBytesPerPixel;
std::unique_ptr<webrtc::DesktopFrame> frame;
if (shared_memory_factory) {
int buffer_size = kWidth * kHeight * kBytesPerPixel;
frame = std::make_unique<webrtc::SharedMemoryDesktopFrame>(
webrtc::DesktopSize(kWidth, kHeight), kWidth * kBytesPerPixel,
shared_memory_factory->CreateSharedMemory(buffer_size).release());
} else {
frame = std::make_unique<webrtc::BasicDesktopFrame>(
webrtc::DesktopSize(kWidth, kHeight));
}
// Move the box.
bool old_box_pos_x = box_pos_x_;
box_pos_x_ += box_speed_x_;
if (box_pos_x_ + kBoxWidth >= kWidth || box_pos_x_ == 0) {
box_speed_x_ = -box_speed_x_;
}
bool old_box_pos_y = box_pos_y_;
box_pos_y_ += box_speed_y_;
if (box_pos_y_ + kBoxHeight >= kHeight || box_pos_y_ == 0) {
box_speed_y_ = -box_speed_y_;
}
memset(frame->data(), 0xff, kHeight * frame->stride());
// Draw rectangle with the following colors in its corners:
// cyan....yellow
// ..............
// blue.......red
uint8_t* row = frame->data() +
(box_pos_y_ * size_.width() + box_pos_x_) * kBytesPerPixel;
for (int y = 0; y < kBoxHeight; ++y) {
for (int x = 0; x < kBoxWidth; ++x) {
int r = x * 255 / kBoxWidth;
int g = y * 255 / kBoxHeight;
int b = 255 - (x * 255 / kBoxWidth);
row[x * kBytesPerPixel] = r;
row[x * kBytesPerPixel + 1] = g;
row[x * kBytesPerPixel + 2] = b;
row[x * kBytesPerPixel + 3] = 0xff;
}
row += frame->stride();
}
if (first_frame_) {
frame->mutable_updated_region()->SetRect(
webrtc::DesktopRect::MakeXYWH(0, 0, kWidth, kHeight));
first_frame_ = false;
} else {
frame->mutable_updated_region()->SetRect(webrtc::DesktopRect::MakeXYWH(
old_box_pos_x, old_box_pos_y, kBoxWidth, kBoxHeight));
frame->mutable_updated_region()->AddRect(webrtc::DesktopRect::MakeXYWH(
box_pos_x_, box_pos_y_, kBoxWidth, kBoxHeight));
}
return frame;
}
} // namespace
FakeDesktopCapturer::FakeDesktopCapturer() : callback_(nullptr) {
frame_generator_ =
base::BindRepeating(&DefaultFrameGenerator::GenerateFrame,
base::MakeRefCounted<DefaultFrameGenerator>());
}
FakeDesktopCapturer::~FakeDesktopCapturer() = default;
void FakeDesktopCapturer::set_frame_generator(FrameGenerator frame_generator) {
DCHECK(!callback_);
frame_generator_ = std::move(frame_generator);
}
void FakeDesktopCapturer::Start(Callback* callback) {
DCHECK(!callback_);
DCHECK(callback);
callback_ = callback;
}
void FakeDesktopCapturer::SetSharedMemoryFactory(
std::unique_ptr<webrtc::SharedMemoryFactory> shared_memory_factory) {
shared_memory_factory_ = std::move(shared_memory_factory);
}
void FakeDesktopCapturer::CaptureFrame() {
base::Time capture_start_time = base::Time::Now();
std::unique_ptr<webrtc::DesktopFrame> frame =
frame_generator_.Run(shared_memory_factory_.get());
if (frame) {
frame->set_capture_time_ms(
(base::Time::Now() - capture_start_time).InMillisecondsRoundedUp());
}
auto result = frame ? webrtc::DesktopCapturer::Result::SUCCESS
: webrtc::DesktopCapturer::Result::ERROR_TEMPORARY;
// Post a task for the OnCaptureResult call to allow the stack to unwind and
// simulate the actual product more accurately. Calling OnCaptureResult()
// directly also leads to issues when testing with shared memory regions and
// IPC as the callback invocation will occur before the shared region can be
// set up.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&webrtc::DesktopCapturer::Callback::OnCaptureResult,
base::Unretained(callback_), result, std::move(frame)));
}
bool FakeDesktopCapturer::GetSourceList(SourceList* sources) {
NOTIMPLEMENTED();
return false;
}
bool FakeDesktopCapturer::SelectSource(SourceId id) {
NOTIMPLEMENTED();
return false;
}
} // namespace remoting::protocol
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