mirror of
https://github.com/mozilla/gecko-dev.git
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114 lines
3 KiB
C++
114 lines
3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "CompositionRecorder.h"
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#include "gfxUtils.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/gfxVars.h"
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#include "nsIInputStream.h"
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#include "nsIBinaryOutputStream.h"
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#include "nsIObjectOutputStream.h"
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#include "prtime.h"
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#include <ctime>
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#include <iomanip>
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#include "stdio.h"
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#ifdef XP_WIN
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# include "direct.h"
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#else
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# include <sys/types.h>
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# include "sys/stat.h"
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#endif
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using namespace mozilla::gfx;
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namespace mozilla {
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namespace layers {
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CompositionRecorder::CompositionRecorder(TimeStamp aRecordingStart)
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: mRecordingStart(aRecordingStart) {}
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void CompositionRecorder::RecordFrame(RecordedFrame* aFrame) {
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mRecordedFrames.AppendElement(aFrame);
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}
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Maybe<FrameRecording> CompositionRecorder::GetRecording() {
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FrameRecording recording;
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recording.startTime() = mRecordingStart;
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nsTArray<uint8_t> bytes;
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for (RefPtr<RecordedFrame>& recordedFrame : mRecordedFrames) {
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RefPtr<DataSourceSurface> surf = recordedFrame->GetSourceSurface();
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if (!surf) {
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return Nothing();
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}
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nsCOMPtr<nsIInputStream> imgStream;
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nsresult rv = gfxUtils::EncodeSourceSurfaceAsStream(
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surf, ImageType::PNG, u""_ns, getter_AddRefs(imgStream));
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if (NS_FAILED(rv)) {
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return Nothing();
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}
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uint64_t bufSize64;
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rv = imgStream->Available(&bufSize64);
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if (NS_FAILED(rv) || bufSize64 > UINT32_MAX) {
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return Nothing();
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}
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const uint32_t frameLength = static_cast<uint32_t>(bufSize64);
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size_t startIndex = bytes.Length();
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bytes.SetLength(startIndex + frameLength);
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uint8_t* bytePtr = &bytes[startIndex];
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uint32_t bytesLeft = frameLength;
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while (bytesLeft > 0) {
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uint32_t bytesRead = 0;
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rv = imgStream->Read(reinterpret_cast<char*>(bytePtr), bytesLeft,
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&bytesRead);
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if (NS_FAILED(rv) || bytesRead == 0) {
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return Nothing();
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}
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bytePtr += bytesRead;
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bytesLeft -= bytesRead;
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}
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#ifdef DEBUG
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// Currently, all implementers of imgIEncoder report their exact size
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// through nsIInputStream::Available(), but let's explicitly state that we
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// rely on that behavior for the algorithm above.
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char dummy = 0;
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uint32_t bytesRead = 0;
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rv = imgStream->Read(&dummy, 1, &bytesRead);
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MOZ_ASSERT(NS_SUCCEEDED(rv) && bytesRead == 0);
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#endif
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RecordedFrameData frameData;
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frameData.timeOffset() = recordedFrame->GetTimeStamp();
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frameData.length() = frameLength;
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recording.frames().AppendElement(std::move(frameData));
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// Now that we're done, release the frame so we can free up its memory
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recordedFrame = nullptr;
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}
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mRecordedFrames.Clear();
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recording.bytes() = ipc::BigBuffer(bytes);
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return Some(std::move(recording));
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}
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} // namespace layers
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} // namespace mozilla
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