| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h" |
| |
| #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h" |
| #include "core/frame/ImageBitmap.h" |
| #include "core/frame/Settings.h" |
| #include "core/workers/WorkerGlobalScope.h" |
| #include "core/workers/WorkerSettings.h" |
| #include "platform/graphics/ImageBuffer.h" |
| #include "platform/graphics/StaticBitmapImage.h" |
| #include "platform/graphics/UnacceleratedImageBufferSurface.h" |
| #include "platform/graphics/gpu/AcceleratedImageBufferSurface.h" |
| #include "wtf/Assertions.h" |
| |
| #define UNIMPLEMENTED ASSERT_NOT_REACHED |
| |
| namespace blink { |
| |
| OffscreenCanvasRenderingContext2D::~OffscreenCanvasRenderingContext2D() {} |
| |
| OffscreenCanvasRenderingContext2D::OffscreenCanvasRenderingContext2D( |
| ScriptState* scriptState, |
| OffscreenCanvas* canvas, |
| const CanvasContextCreationAttributes& attrs) |
| : CanvasRenderingContext(nullptr, canvas, attrs) { |
| ExecutionContext* executionContext = scriptState->getExecutionContext(); |
| if (executionContext->isDocument()) { |
| if (toDocument(executionContext)->settings()->disableReadingFromCanvas()) |
| canvas->setDisableReadingFromCanvasTrue(); |
| return; |
| } |
| |
| WorkerSettings* workerSettings = |
| toWorkerGlobalScope(executionContext)->workerSettings(); |
| if (workerSettings && workerSettings->disableReadingFromCanvas()) |
| canvas->setDisableReadingFromCanvasTrue(); |
| } |
| |
| DEFINE_TRACE(OffscreenCanvasRenderingContext2D) { |
| CanvasRenderingContext::trace(visitor); |
| BaseRenderingContext2D::trace(visitor); |
| } |
| |
| void OffscreenCanvasRenderingContext2D::commit(ExceptionState& exceptionState) { |
| if (getOffscreenCanvas()->getAssociatedCanvasId() < 0) { |
| // If an OffscreenCanvas has no associated canvas Id, it indicates that |
| // it is not an OffscreenCanvas created by transfering control from html |
| // canvas. |
| exceptionState.throwDOMException(InvalidStateError, |
| "Commit() was called on a context whose " |
| "OffscreenCanvas is not associated with a " |
| "canvas element."); |
| return; |
| } |
| RefPtr<StaticBitmapImage> image = this->transferToStaticBitmapImage(); |
| getOffscreenCanvas()->getOrCreateFrameDispatcher()->dispatchFrame( |
| std::move(image)); |
| } |
| |
| // BaseRenderingContext2D implementation |
| bool OffscreenCanvasRenderingContext2D::originClean() const { |
| return getOffscreenCanvas()->originClean(); |
| } |
| |
| void OffscreenCanvasRenderingContext2D::setOriginTainted() { |
| return getOffscreenCanvas()->setOriginTainted(); |
| } |
| |
| bool OffscreenCanvasRenderingContext2D::wouldTaintOrigin( |
| CanvasImageSource* source, |
| ExecutionContext* executionContext) { |
| if (executionContext->isWorkerGlobalScope()) { |
| // We only support passing in ImageBitmap and OffscreenCanvases as source |
| // images in drawImage() or createPattern() in a OffscreenCanvas2d in |
| // worker. |
| DCHECK(source->isImageBitmap() || source->isOffscreenCanvas()); |
| } |
| |
| return CanvasRenderingContext::wouldTaintOrigin( |
| source, executionContext->getSecurityOrigin()); |
| } |
| |
| int OffscreenCanvasRenderingContext2D::width() const { |
| return getOffscreenCanvas()->width(); |
| } |
| |
| int OffscreenCanvasRenderingContext2D::height() const { |
| return getOffscreenCanvas()->height(); |
| } |
| |
| bool OffscreenCanvasRenderingContext2D::hasImageBuffer() const { |
| return !!m_imageBuffer; |
| } |
| |
| ImageBuffer* OffscreenCanvasRenderingContext2D::imageBuffer() const { |
| if (!m_imageBuffer) { |
| IntSize surfaceSize(width(), height()); |
| OpacityMode opacityMode = hasAlpha() ? NonOpaque : Opaque; |
| std::unique_ptr<ImageBufferSurface> surface; |
| if (RuntimeEnabledFeatures::accelerated2dCanvasEnabled()) { |
| surface.reset( |
| new AcceleratedImageBufferSurface(surfaceSize, opacityMode)); |
| } |
| |
| if (!surface || !surface->isValid()) { |
| surface.reset(new UnacceleratedImageBufferSurface( |
| surfaceSize, opacityMode, InitializeImagePixels)); |
| } |
| |
| OffscreenCanvasRenderingContext2D* nonConstThis = |
| const_cast<OffscreenCanvasRenderingContext2D*>(this); |
| nonConstThis->m_imageBuffer = ImageBuffer::create(std::move(surface)); |
| |
| if (m_needsMatrixClipRestore) { |
| restoreMatrixClipStack(m_imageBuffer->canvas()); |
| nonConstThis->m_needsMatrixClipRestore = false; |
| } |
| } |
| |
| return m_imageBuffer.get(); |
| } |
| |
| RefPtr<StaticBitmapImage> |
| OffscreenCanvasRenderingContext2D::transferToStaticBitmapImage() { |
| if (!imageBuffer()) |
| return nullptr; |
| sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot( |
| PreferAcceleration, SnapshotReasonTransferToImageBitmap); |
| RefPtr<StaticBitmapImage> image = |
| StaticBitmapImage::create(std::move(skImage)); |
| image->setOriginClean(this->originClean()); |
| return image; |
| } |
| |
| ImageBitmap* OffscreenCanvasRenderingContext2D::transferToImageBitmap( |
| ExceptionState& exceptionState) { |
| RefPtr<StaticBitmapImage> image = transferToStaticBitmapImage(); |
| if (!image) |
| return nullptr; |
| m_imageBuffer.reset(); // "Transfer" means no retained buffer |
| m_needsMatrixClipRestore = true; |
| return ImageBitmap::create(std::move(image)); |
| } |
| |
| PassRefPtr<Image> OffscreenCanvasRenderingContext2D::getImage( |
| AccelerationHint hint, |
| SnapshotReason reason) const { |
| if (!imageBuffer()) |
| return nullptr; |
| sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(hint, reason); |
| RefPtr<StaticBitmapImage> image = |
| StaticBitmapImage::create(std::move(skImage)); |
| return image; |
| } |
| |
| void OffscreenCanvasRenderingContext2D::setOffscreenCanvasGetContextResult( |
| OffscreenRenderingContext& result) { |
| result.setOffscreenCanvasRenderingContext2D(this); |
| } |
| |
| bool OffscreenCanvasRenderingContext2D::parseColorOrCurrentColor( |
| Color& color, |
| const String& colorString) const { |
| return ::blink::parseColorOrCurrentColor(color, colorString, nullptr); |
| } |
| |
| SkCanvas* OffscreenCanvasRenderingContext2D::drawingCanvas() const { |
| ImageBuffer* buffer = imageBuffer(); |
| if (!buffer) |
| return nullptr; |
| return imageBuffer()->canvas(); |
| } |
| |
| SkCanvas* OffscreenCanvasRenderingContext2D::existingDrawingCanvas() const { |
| if (!m_imageBuffer) |
| return nullptr; |
| return m_imageBuffer->canvas(); |
| } |
| |
| void OffscreenCanvasRenderingContext2D::disableDeferral(DisableDeferralReason) { |
| } |
| |
| AffineTransform OffscreenCanvasRenderingContext2D::baseTransform() const { |
| if (!m_imageBuffer) |
| return AffineTransform(); // identity |
| return m_imageBuffer->baseTransform(); |
| } |
| |
| void OffscreenCanvasRenderingContext2D::didDraw(const SkIRect& dirtyRect) {} |
| |
| bool OffscreenCanvasRenderingContext2D::stateHasFilter() { |
| // TODO: crbug.com/593838 make hasFilter accept nullptr |
| // return state().hasFilter(nullptr, nullptr, IntSize(width(), height()), |
| // this); |
| return false; |
| } |
| |
| SkImageFilter* OffscreenCanvasRenderingContext2D::stateGetFilter() { |
| // TODO: make getFilter accept nullptr |
| // return state().getFilter(nullptr, nullptr, IntSize(width(), height()), |
| // this); |
| return nullptr; |
| } |
| |
| void OffscreenCanvasRenderingContext2D::validateStateStack() const { |
| #if ENABLE(ASSERT) |
| SkCanvas* skCanvas = existingDrawingCanvas(); |
| if (skCanvas) { |
| ASSERT(static_cast<size_t>(skCanvas->getSaveCount()) == |
| m_stateStack.size()); |
| } |
| #endif |
| } |
| |
| bool OffscreenCanvasRenderingContext2D::isContextLost() const { |
| return false; |
| } |
| |
| bool OffscreenCanvasRenderingContext2D::isPaintable() const { |
| return this->imageBuffer(); |
| } |
| } |