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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(GPU_PROCESS)
#include "RemoteSnapshot.h"
#include "WebImage.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebKit {
using namespace WebCore;
WTF_MAKE_TZONE_ALLOCATED_IMPL(RemoteSnapshot);
Ref<RemoteSnapshot> RemoteSnapshot::create()
{
return adoptRef(*new RemoteSnapshot);
}
RemoteSnapshot::RemoteSnapshot() = default;
RemoteSnapshot::~RemoteSnapshot() = default;
bool RemoteSnapshot::addFrameReference(FrameIdentifier frameIdentifier)
{
Locker locker(m_lock);
m_referencedFrames++;
auto result = m_frameDisplayLists.add(frameIdentifier, std::nullopt);
if (result.isNewEntry)
return true;
// It is ok to setFrame win the race. It is not ok to have two addFrameReferences.
return !result.iterator->value;
}
bool RemoteSnapshot::setFrame(FrameIdentifier frameIdentifier, Ref<const DisplayList::DisplayList>&& displayList, SerialFunctionDispatcher& releaseDispatcher)
{
Locker locker(m_lock);
m_completedFrames++;
auto iterator = m_frameDisplayLists.find(frameIdentifier);
if (iterator == m_frameDisplayLists.end()) {
m_frameDisplayLists.add(frameIdentifier, DisplayListAndReleaseDispatcher { WTFMove(displayList), releaseDispatcher });
return true;
}
// It is ok to addFrameReference to win the race. It's not ok to have two setFrames.
if (iterator->value)
return false;
iterator->value = DisplayListAndReleaseDispatcher { WTFMove(displayList), releaseDispatcher };
return true;
}
bool RemoteSnapshot::applyFrame(FrameIdentifier frameIdentifier, GraphicsContext& context) const
{
RefPtr<const DisplayList::DisplayList> displayList;
{
Locker locker(m_lock);
auto iterator = m_frameDisplayLists.find(frameIdentifier);
if (iterator != m_frameDisplayLists.end())
displayList = iterator->value->displayList();
}
if (!displayList)
return false;
context.drawDisplayList(*displayList);
return true;
}
bool RemoteSnapshot::isComplete() const
{
Locker locker(m_lock);
return m_completedFrames == m_referencedFrames; // Duplicates are handled when the values are updated.
}
RemoteSnapshot::DisplayListAndReleaseDispatcher::DisplayListAndReleaseDispatcher(Ref<const WebCore::DisplayList::DisplayList>&& displayList, SerialFunctionDispatcher& dispatcher)
: m_displayList(WTFMove(displayList))
, m_dispatcher(dispatcher)
{
}
RemoteSnapshot::DisplayListAndReleaseDispatcher::~DisplayListAndReleaseDispatcher()
{
if (m_displayList)
m_dispatcher->dispatch([displayList = WTFMove(m_displayList)]() mutable { });
}
#if PLATFORM(COCOA)
std::optional<RefPtr<SharedBuffer>> RemoteSnapshot::drawToPDF(const FloatSize& size, FrameIdentifier rootIdentifier)
{
ASSERT(isComplete());
RefPtr buffer = ImageBuffer::create(size, RenderingMode::PDFDocument, RenderingPurpose::Snapshot, 1, DestinationColorSpace::SRGB(), PixelFormat::BGRA8);
if (!buffer)
return nullptr;
auto& context = buffer->context();
if (!applyFrame(rootIdentifier, context))
return std::nullopt;
return ImageBuffer::sinkIntoPDFDocument(WTFMove(buffer));
}
#endif
std::optional<ShareableBitmap::Handle> RemoteSnapshot::drawToBitmap(const FloatSize& size, FrameIdentifier rootFrameIdentifier)
{
ASSERT(isComplete());
RefPtr image = WebImage::create(size, ImageOption::Shareable, DestinationColorSpace::SRGB());
if (!image)
return std::nullopt;
auto& context = *image->context();
if (!applyFrame(rootFrameIdentifier, context))
return std::nullopt;
return image->createHandle(SharedMemory::Protection::ReadOnly);
}
}
#endif
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