| /* |
| * 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 = InterpolationLow; |
| #else |
| const InterpolationQuality defaultInterpolationQuality = InterpolationDefault; |
| #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(); |
| |
| #ifndef NDEBUG |
| 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(); |
| } |
| |
| void CanvasBase::setImageBuffer(std::unique_ptr<ImageBuffer>&& buffer) const |
| { |
| { |
| auto locker = holdLock(m_imageBufferAssignmentLock); |
| m_contextStateSaver = nullptr; |
| m_imageBuffer = WTFMove(buffer); |
| } |
| |
| if (m_imageBuffer && m_size != m_imageBuffer->internalSize()) |
| m_size = m_imageBuffer->internalSize(); |
| |
| 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) |
| return; |
| |
| 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(m_imageBufferCost); |
| } |
| |
| 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(); |
| } |
| } |
| |
| } |