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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.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/test/base/save_desktop_snapshot.h"
#include <memory>
#include <utility>
#include <vector>
#include "base/command_line.h"
#include "base/files/file.h"
#include "base/i18n/time_formatting.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/test/test_future.h"
#include "base/time/time.h"
#include "content/public/browser/desktop_capture.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
#include "ui/gfx/codec/png_codec.h"
namespace {
// A callback that holds the last frame captured by a webrtc::DesktopCapturer.
class FrameHolder : public webrtc::DesktopCapturer::Callback {
public:
FrameHolder() = default;
FrameHolder(const FrameHolder&) = delete;
FrameHolder& operator=(const FrameHolder&) = delete;
// Returns the frame that was captured or null in case of failure.
std::unique_ptr<webrtc::DesktopFrame> TakeFrame() {
CHECK(signal_.Wait());
return std::move(frame_);
}
private:
// webrtc::DesktopCapturer::Callback:
void OnCaptureResult(webrtc::DesktopCapturer::Result result,
std::unique_ptr<webrtc::DesktopFrame> frame) override {
if (result == webrtc::DesktopCapturer::Result::SUCCESS)
frame_ = std::move(frame);
signal_.SetValue();
}
std::unique_ptr<webrtc::DesktopFrame> frame_;
base::test::TestFuture<void> signal_;
};
// Captures and returns a snapshot of the screen, or an empty bitmap in case of
// error.
SkBitmap CaptureScreen() {
std::unique_ptr<webrtc::DesktopCapturer> capturer =
content::desktop_capture::CreateScreenCapturer(
content::desktop_capture::CreateDesktopCaptureOptions(),
/*for_snapshot=*/true);
if (!capturer) {
LOG(ERROR) << "Failed to create a screen capturer.";
return SkBitmap();
}
// Grab a single frame.
FrameHolder frame_holder;
capturer->Start(&frame_holder);
capturer->CaptureFrame();
std::unique_ptr<webrtc::DesktopFrame> frame(frame_holder.TakeFrame());
if (!frame) {
LOG(ERROR) << "Failed to capture a frame of the screen for a snapshot.";
return SkBitmap();
}
// Create an image from the frame.
SkBitmap result;
result.allocN32Pixels(frame->size().width(), frame->size().height(), true);
memcpy(result.getAddr32(0, 0), frame->data(),
frame->size().width() * frame->size().height() *
webrtc::DesktopFrame::kBytesPerPixel);
return result;
}
} // namespace
const char kSnapshotOutputDir[] = "snapshot-output-dir";
base::FilePath SaveDesktopSnapshot() {
const base::FilePath output_dir =
base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
kSnapshotOutputDir);
if (output_dir.empty())
return base::FilePath();
return SaveDesktopSnapshot(output_dir);
}
base::FilePath SaveDesktopSnapshot(const base::FilePath& output_dir) {
// Take the snapshot and encode it.
SkBitmap screen = CaptureScreen();
if (screen.drawsNothing()) {
return base::FilePath();
}
std::optional<std::vector<uint8_t>> encoded =
gfx::PNGCodec::EncodeBGRASkBitmap(CaptureScreen(),
/*discard_transparency=*/false);
if (!encoded) {
LOG(ERROR) << "Failed to PNG encode screen snapshot.";
return base::FilePath();
}
// Create the output file.
base::FilePath output_path =
output_dir.AppendASCII(base::UnlocalizedTimeFormatWithPattern(
base::Time::Now(), "'ss_'yyyyMMddHHmmss_SSS'.png'"));
uint32_t flags = base::File::FLAG_CREATE | base::File::FLAG_WRITE;
#if BUILDFLAG(IS_WIN)
flags |=
base::File::FLAG_WIN_SHARE_DELETE | base::File::FLAG_CAN_DELETE_ON_CLOSE;
#endif
base::File file(output_path, flags);
if (!file.IsValid()) {
if (file.error_details() == base::File::FILE_ERROR_EXISTS) {
LOG(INFO) << "Skipping screen snapshot since it is already present: "
<< output_path.BaseName();
} else {
LOG(ERROR) << "Failed to create snapshot output file \"" << output_path
<< "\" with error " << file.error_details();
}
return base::FilePath();
}
// Write it to disk.
if (!file.WriteAtCurrentPosAndCheck(encoded.value())) {
LOG(ERROR) << "Failed to write entire snapshot to file";
return base::FilePath();
}
return output_path;
}
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