blob: 162b2942f666a932460b06e76d0836e43c017170 [file] [log] [blame]
/*
* Copyright (C) 2017 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. ``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
* 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"
#include "CanvasBase.h"
#include "CSSCanvasValue.h"
#include "CanvasRenderingContext.h"
#include "Element.h"
#include "FloatRect.h"
#include "InspectorInstrumentation.h"
#include <JavaScriptCore/JSCInlines.h>
#include <JavaScriptCore/JSLock.h>
#include <atomic>
#include <wtf/Vector.h>
static std::atomic<size_t> s_activePixelMemory { 0 };
namespace WebCore {
#if USE(CG)
// FIXME: It seems strange that the default quality is not the one that is literally named "default".
// Should fix names to make this easier to understand, or write an excellent comment here explaining why not.
const InterpolationQuality defaultInterpolationQuality = InterpolationQuality::Low;
#else
const InterpolationQuality defaultInterpolationQuality = InterpolationQuality::Default;
#endif
CanvasBase::CanvasBase(IntSize size)
: m_size(size)
{
}
CanvasBase::~CanvasBase()
{
ASSERT(m_didNotifyObserversCanvasDestroyed);
ASSERT(m_observers.isEmpty());
ASSERT(!m_imageBuffer);
}
GraphicsContext* CanvasBase::drawingContext() const
{
auto* context = renderingContext();
if (context && !context->is2d() && !context->isOffscreen2d())
return nullptr;
return buffer() ? &m_imageBuffer->context() : nullptr;
}
GraphicsContext* CanvasBase::existingDrawingContext() const
{
if (!hasCreatedImageBuffer())
return nullptr;
return drawingContext();
}
ImageBuffer* CanvasBase::buffer() const
{
if (!hasCreatedImageBuffer())
createImageBuffer();
return m_imageBuffer.get();
}
AffineTransform CanvasBase::baseTransform() const
{
ASSERT(hasCreatedImageBuffer());
return m_imageBuffer->baseTransform();
}
void CanvasBase::makeRenderingResultsAvailable()
{
if (auto* context = renderingContext())
context->paintRenderingResultsToCanvas();
}
size_t CanvasBase::memoryCost() const
{
// memoryCost() may be invoked concurrently from a GC thread, and we need to be careful
// about what data we access here and how. We need to hold a lock to prevent m_imageBuffer
// from being changed while we access it.
auto locker = holdLock(m_imageBufferAssignmentLock);
if (!m_imageBuffer)
return 0;
return m_imageBuffer->memoryCost();
}
size_t CanvasBase::externalMemoryCost() const
{
// externalMemoryCost() may be invoked concurrently from a GC thread, and we need to be careful
// about what data we access here and how. We need to hold a lock to prevent m_imageBuffer
// from being changed while we access it.
auto locker = holdLock(m_imageBufferAssignmentLock);
if (!m_imageBuffer)
return 0;
return m_imageBuffer->externalMemoryCost();
}
void CanvasBase::addObserver(CanvasObserver& observer)
{
m_observers.add(&observer);
if (is<CSSCanvasValue::CanvasObserverProxy>(observer))
InspectorInstrumentation::didChangeCSSCanvasClientNodes(*this);
}
void CanvasBase::removeObserver(CanvasObserver& observer)
{
m_observers.remove(&observer);
if (is<CSSCanvasValue::CanvasObserverProxy>(observer))
InspectorInstrumentation::didChangeCSSCanvasClientNodes(*this);
}
void CanvasBase::notifyObserversCanvasChanged(const FloatRect& rect)
{
for (auto& observer : copyToVector(m_observers))
observer->canvasChanged(*this, rect);
}
void CanvasBase::notifyObserversCanvasResized()
{
for (auto& observer : copyToVector(m_observers))
observer->canvasResized(*this);
}
void CanvasBase::notifyObserversCanvasDestroyed()
{
ASSERT(!m_didNotifyObserversCanvasDestroyed);
for (auto& observer : copyToVector(m_observers))
observer->canvasDestroyed(*this);
m_observers.clear();
#if ASSERT_ENABLED
m_didNotifyObserversCanvasDestroyed = true;
#endif
}
HashSet<Element*> CanvasBase::cssCanvasClients() const
{
HashSet<Element*> cssCanvasClients;
for (auto& observer : m_observers) {
if (!is<CSSCanvasValue::CanvasObserverProxy>(observer))
continue;
auto clients = downcast<CSSCanvasValue::CanvasObserverProxy>(observer)->ownerValue().clients();
for (auto& entry : clients) {
if (RefPtr<Element> element = entry.key->element())
cssCanvasClients.add(element.get());
}
}
return cssCanvasClients;
}
bool CanvasBase::callTracingActive() const
{
auto* context = renderingContext();
return context && context->callTracingActive();
}
std::unique_ptr<ImageBuffer> CanvasBase::setImageBuffer(std::unique_ptr<ImageBuffer>&& buffer) const
{
std::unique_ptr<ImageBuffer> returnBuffer;
{
auto locker = holdLock(m_imageBufferAssignmentLock);
m_contextStateSaver = nullptr;
returnBuffer = std::exchange(m_imageBuffer, WTFMove(buffer));
}
if (m_imageBuffer && m_size != m_imageBuffer->backendSize())
m_size = m_imageBuffer->backendSize();
size_t previousMemoryCost = m_imageBufferCost;
m_imageBufferCost = memoryCost();
s_activePixelMemory += m_imageBufferCost - previousMemoryCost;
auto* context = renderingContext();
if (context && m_imageBuffer && previousMemoryCost != m_imageBufferCost)
InspectorInstrumentation::didChangeCanvasMemory(*context);
if (m_imageBuffer) {
m_imageBuffer->context().setShadowsIgnoreTransforms(true);
m_imageBuffer->context().setImageInterpolationQuality(defaultInterpolationQuality);
m_imageBuffer->context().setStrokeThickness(1);
m_contextStateSaver = makeUnique<GraphicsContextStateSaver>(m_imageBuffer->context());
JSC::JSLockHolder lock(scriptExecutionContext()->vm());
scriptExecutionContext()->vm().heap.reportExtraMemoryAllocated(memoryCost());
}
return returnBuffer;
}
size_t CanvasBase::activePixelMemory()
{
return s_activePixelMemory.load();
}
void CanvasBase::resetGraphicsContextState() const
{
if (m_contextStateSaver) {
// Reset to the initial graphics context state.
m_contextStateSaver->restore();
m_contextStateSaver->save();
}
}
}