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/*
* 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. 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"
#include "OffscreenCanvas.h"
#if ENABLE(OFFSCREEN_CANVAS)
#include "CSSValuePool.h"
#include "CanvasRenderingContext.h"
#include "Document.h"
#include "HTMLCanvasElement.h"
#include "ImageBitmap.h"
#include "ImageData.h"
#include "JSBlob.h"
#include "JSDOMPromiseDeferred.h"
#include "MIMETypeRegistry.h"
#include "OffscreenCanvasRenderingContext2D.h"
#include "PlaceholderRenderingContext.h"
#include "RuntimeEnabledFeatures.h"
#include "WorkerGlobalScope.h"
#include <wtf/IsoMallocInlines.h>
#if ENABLE(WEBGL)
#include "Settings.h"
#include "WebGLRenderingContext.h"
#if ENABLE(WEBGL2)
#include "WebGL2RenderingContext.h"
#endif
#endif // ENABLE(WEBGL)
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(OffscreenCanvas);
DetachedOffscreenCanvas::DetachedOffscreenCanvas(RefPtr<ImageBuffer>&& buffer, const IntSize& size, bool originClean)
: m_buffer(WTFMove(buffer))
, m_size(size)
, m_originClean(originClean)
{
}
RefPtr<ImageBuffer> DetachedOffscreenCanvas::takeImageBuffer()
{
return WTFMove(m_buffer);
}
WeakPtr<HTMLCanvasElement> DetachedOffscreenCanvas::takePlaceholderCanvas()
{
ASSERT(isMainThread());
return std::exchange(m_placeholderCanvas, nullptr);
}
bool OffscreenCanvas::enabledForContext(ScriptExecutionContext& context)
{
#if ENABLE(OFFSCREEN_CANVAS_IN_WORKERS)
if (context.isWorkerGlobalScope())
return RuntimeEnabledFeatures::sharedFeatures().offscreenCanvasInWorkersEnabled();
#endif
ASSERT(context.isDocument());
return true;
}
Ref<OffscreenCanvas> OffscreenCanvas::create(ScriptExecutionContext& scriptExecutionContext, unsigned width, unsigned height)
{
return adoptRef(*new OffscreenCanvas(scriptExecutionContext, width, height));
}
Ref<OffscreenCanvas> OffscreenCanvas::create(ScriptExecutionContext& scriptExecutionContext, std::unique_ptr<DetachedOffscreenCanvas>&& detachedCanvas)
{
Ref<OffscreenCanvas> clone = adoptRef(*new OffscreenCanvas(scriptExecutionContext, detachedCanvas->size().width(), detachedCanvas->size().height()));
clone->setImageBuffer(detachedCanvas->takeImageBuffer());
if (!detachedCanvas->originClean())
clone->setOriginTainted();
callOnMainThread([detachedCanvas = WTFMove(detachedCanvas), placeholderData = Ref { *clone->m_placeholderData }] () mutable {
placeholderData->canvas = detachedCanvas->takePlaceholderCanvas();
if (placeholderData->canvas) {
auto& placeholderContext = downcast<PlaceholderRenderingContext>(*placeholderData->canvas->renderingContext());
auto& imageBufferPipe = placeholderContext.imageBufferPipe();
if (imageBufferPipe)
placeholderData->bufferPipeSource = imageBufferPipe->source();
}
});
return clone;
}
Ref<OffscreenCanvas> OffscreenCanvas::create(ScriptExecutionContext& scriptExecutionContext, HTMLCanvasElement& canvas)
{
auto offscreen = adoptRef(*new OffscreenCanvas(scriptExecutionContext, canvas.width(), canvas.height()));
offscreen->setPlaceholderCanvas(canvas);
return offscreen;
}
OffscreenCanvas::OffscreenCanvas(ScriptExecutionContext& scriptExecutionContext, unsigned width, unsigned height)
: CanvasBase(IntSize(width, height))
, ContextDestructionObserver(&scriptExecutionContext)
, m_placeholderData(PlaceholderData::create())
{
}
OffscreenCanvas::~OffscreenCanvas()
{
notifyObserversCanvasDestroyed();
m_context = nullptr; // Ensure this goes away before the ImageBuffer.
setImageBuffer(nullptr);
}
unsigned OffscreenCanvas::width() const
{
if (m_detached)
return 0;
return CanvasBase::width();
}
unsigned OffscreenCanvas::height() const
{
if (m_detached)
return 0;
return CanvasBase::height();
}
void OffscreenCanvas::setWidth(unsigned newWidth)
{
if (m_detached)
return;
setSize(IntSize(newWidth, height()));
}
void OffscreenCanvas::setHeight(unsigned newHeight)
{
if (m_detached)
return;
setSize(IntSize(width(), newHeight));
}
void OffscreenCanvas::setSize(const IntSize& newSize)
{
CanvasBase::setSize(newSize);
reset();
}
#if ENABLE(WEBGL)
static bool requiresAcceleratedCompositingForWebGL()
{
#if PLATFORM(GTK) || PLATFORM(WIN_CAIRO)
return false;
#else
return true;
#endif
}
static bool shouldEnableWebGL(bool webGLEnabled, bool acceleratedCompositingEnabled)
{
if (!webGLEnabled)
return false;
if (!requiresAcceleratedCompositingForWebGL())
return true;
return acceleratedCompositingEnabled;
}
void OffscreenCanvas::createContextWebGL(RenderingContextType contextType, WebGLContextAttributes&& attrs)
{
ASSERT(!m_context);
auto scriptExecutionContext = this->scriptExecutionContext();
if (scriptExecutionContext->isWorkerGlobalScope()) {
WorkerGlobalScope& workerGlobalScope = downcast<WorkerGlobalScope>(*scriptExecutionContext);
if (!shouldEnableWebGL(workerGlobalScope.settingsValues().webGLEnabled, workerGlobalScope.settingsValues().acceleratedCompositingEnabled))
return;
} else if (scriptExecutionContext->isDocument()) {
auto& settings = downcast<Document>(*scriptExecutionContext).settings();
if (!shouldEnableWebGL(settings.webGLEnabled(), settings.acceleratedCompositingEnabled()))
return;
} else
return;
GraphicsContextGLWebGLVersion webGLVersion = GraphicsContextGLWebGLVersion::WebGL1;
#if ENABLE(WEBGL2)
webGLVersion = (contextType == RenderingContextType::Webgl) ? GraphicsContextGLWebGLVersion::WebGL1 : GraphicsContextGLWebGLVersion::WebGL2;
#else
UNUSED_PARAM(contextType);
#endif
m_context = WebGLRenderingContextBase::create(*this, attrs, webGLVersion);
}
#endif // ENABLE(WEBGL)
ExceptionOr<std::optional<OffscreenRenderingContext>> OffscreenCanvas::getContext(JSC::JSGlobalObject& state, RenderingContextType contextType, FixedVector<JSC::Strong<JSC::Unknown>>&& arguments)
{
if (m_detached)
return Exception { InvalidStateError };
if (contextType == RenderingContextType::_2d) {
if (m_context) {
if (!is<OffscreenCanvasRenderingContext2D>(*m_context))
return { { std::nullopt } };
return { { RefPtr<OffscreenCanvasRenderingContext2D> { &downcast<OffscreenCanvasRenderingContext2D>(*m_context) } } };
}
auto scope = DECLARE_THROW_SCOPE(state.vm());
auto settings = convert<IDLDictionary<CanvasRenderingContext2DSettings>>(state, arguments.isEmpty() ? JSC::jsUndefined() : (arguments[0].isObject() ? arguments[0].get() : JSC::jsNull()));
RETURN_IF_EXCEPTION(scope, Exception { ExistingExceptionError });
m_context = makeUnique<OffscreenCanvasRenderingContext2D>(*this, WTFMove(settings));
if (!m_context)
return { { std::nullopt } };
return { { RefPtr<OffscreenCanvasRenderingContext2D> { &downcast<OffscreenCanvasRenderingContext2D>(*m_context) } } };
}
#if ENABLE(WEBGL)
else {
if (m_context) {
if (is<WebGLRenderingContext>(*m_context))
return { { RefPtr<WebGLRenderingContext> { &downcast<WebGLRenderingContext>(*m_context) } } };
#if ENABLE(WEBGL2)
if (is<WebGL2RenderingContext>(*m_context))
return { { RefPtr<WebGL2RenderingContext> { &downcast<WebGL2RenderingContext>(*m_context) } } };
#endif
return { { std::nullopt } };
}
auto scope = DECLARE_THROW_SCOPE(state.vm());
auto attributes = convert<IDLDictionary<WebGLContextAttributes>>(state, arguments.isEmpty() ? JSC::jsUndefined() : (arguments[0].isObject() ? arguments[0].get() : JSC::jsNull()));
RETURN_IF_EXCEPTION(scope, Exception { ExistingExceptionError });
createContextWebGL(contextType, WTFMove(attributes));
if (!m_context)
return { { std::nullopt } };
#if ENABLE(WEBGL2)
if (is<WebGL2RenderingContext>(*m_context))
return { { RefPtr<WebGL2RenderingContext> { &downcast<WebGL2RenderingContext>(*m_context) } } };
#endif
return { { RefPtr<WebGLRenderingContext> { &downcast<WebGLRenderingContext>(*m_context) } } };
}
#endif
return Exception { TypeError };
}
ExceptionOr<RefPtr<ImageBitmap>> OffscreenCanvas::transferToImageBitmap()
{
if (m_detached || !m_context)
return Exception { InvalidStateError };
if (is<OffscreenCanvasRenderingContext2D>(*m_context)) {
if (!width() || !height())
return { RefPtr<ImageBitmap> { nullptr } };
if (!m_hasCreatedImageBuffer) {
auto buffer = ImageBitmap::createImageBuffer(*canvasBaseScriptExecutionContext(), size(), RenderingMode::Unaccelerated, m_context->colorSpace());
return { ImageBitmap::create(ImageBitmapBacking(WTFMove(buffer))) };
}
// As the canvas context state is stored in GraphicsContext, which is owned
// by buffer(), to avoid resetting the context state, we have to make a copy and
// clear the original buffer rather than returning the original buffer.
auto bufferCopy = buffer()->copyRectToBuffer(FloatRect(FloatPoint(), buffer()->logicalSize()), buffer()->colorSpace(), *drawingContext());
downcast<OffscreenCanvasRenderingContext2D>(*m_context).clearCanvas();
clearCopiedImage();
return { ImageBitmap::create(ImageBitmapBacking(WTFMove(bufferCopy), originClean() ? SerializationState::OriginClean : SerializationState())) };
}
#if ENABLE(WEBGL)
if (is<WebGLRenderingContext>(*m_context)) {
auto webGLContext = &downcast<WebGLRenderingContext>(*m_context);
// FIXME: We're supposed to create an ImageBitmap using the backing
// store from this canvas (or its context), but for now we'll just
// create a new bitmap and paint into it.
auto imageBitmap = ImageBitmap::create(*canvasBaseScriptExecutionContext(), size(), DestinationColorSpace::SRGB());
if (!imageBitmap->buffer())
return { RefPtr<ImageBitmap> { nullptr } };
auto* gc3d = webGLContext->graphicsContextGL();
gc3d->paintRenderingResultsToCanvas(*imageBitmap->buffer());
// FIXME: The transfer algorithm requires that the canvas effectively
// creates a new backing store. Since we're not doing that yet, we
// need to erase what's there.
GCGLfloat clearColor[4] { };
gc3d->getFloatv(GraphicsContextGL::COLOR_CLEAR_VALUE, clearColor);
gc3d->clearColor(0, 0, 0, 0);
gc3d->clear(GraphicsContextGL::COLOR_BUFFER_BIT | GraphicsContextGL::DEPTH_BUFFER_BIT | GraphicsContextGL::STENCIL_BUFFER_BIT);
gc3d->clearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
return { WTFMove(imageBitmap) };
}
#endif
return Exception { NotSupportedError };
}
static String toEncodingMimeType(const String& mimeType)
{
if (!MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType))
return "image/png"_s;
return mimeType.convertToASCIILowercase();
}
static std::optional<double> qualityFromDouble(double qualityNumber)
{
if (!(qualityNumber >= 0 && qualityNumber <= 1))
return std::nullopt;
return qualityNumber;
}
void OffscreenCanvas::convertToBlob(ImageEncodeOptions&& options, Ref<DeferredPromise>&& promise)
{
if (!originClean()) {
promise->reject(SecurityError);
return;
}
if (size().isEmpty()) {
promise->reject(IndexSizeError);
return;
}
if (m_detached || !buffer()) {
promise->reject(InvalidStateError);
return;
}
makeRenderingResultsAvailable();
auto encodingMIMEType = toEncodingMimeType(options.type);
auto quality = qualityFromDouble(options.quality);
Vector<uint8_t> blobData = buffer()->toData(encodingMIMEType, quality);
if (blobData.isEmpty()) {
promise->reject(EncodingError);
return;
}
Ref<Blob> blob = Blob::create(canvasBaseScriptExecutionContext(), WTFMove(blobData), encodingMIMEType);
promise->resolveWithNewlyCreated<IDLInterface<Blob>>(WTFMove(blob));
}
void OffscreenCanvas::didDraw(const std::optional<FloatRect>& rect)
{
clearCopiedImage();
scheduleCommitToPlaceholderCanvas();
notifyObserversCanvasChanged(rect);
}
Image* OffscreenCanvas::copiedImage() const
{
if (m_detached)
return nullptr;
if (!m_copiedImage && buffer()) {
if (m_context)
m_context->paintRenderingResultsToCanvas();
m_copiedImage = buffer()->copyImage(CopyBackingStore, PreserveResolution::Yes);
}
return m_copiedImage.get();
}
void OffscreenCanvas::clearCopiedImage() const
{
m_copiedImage = nullptr;
}
SecurityOrigin* OffscreenCanvas::securityOrigin() const
{
auto& scriptExecutionContext = *canvasBaseScriptExecutionContext();
if (is<WorkerGlobalScope>(scriptExecutionContext))
return &downcast<WorkerGlobalScope>(scriptExecutionContext).topOrigin();
return &downcast<Document>(scriptExecutionContext).securityOrigin();
}
bool OffscreenCanvas::canDetach() const
{
return !m_detached && !m_context;
}
std::unique_ptr<DetachedOffscreenCanvas> OffscreenCanvas::detach()
{
if (!canDetach())
return nullptr;
m_detached = true;
auto detached = makeUnique<DetachedOffscreenCanvas>(takeImageBuffer(), size(), originClean());
detached->m_placeholderCanvas = std::exchange(m_placeholderData->canvas, nullptr);
return detached;
}
void OffscreenCanvas::setPlaceholderCanvas(HTMLCanvasElement& canvas)
{
ASSERT(!m_context);
ASSERT(isMainThread());
m_placeholderData->canvas = canvas;
auto& placeholderContext = downcast<PlaceholderRenderingContext>(*canvas.renderingContext());
auto& imageBufferPipe = placeholderContext.imageBufferPipe();
if (imageBufferPipe)
m_placeholderData->bufferPipeSource = imageBufferPipe->source();
}
void OffscreenCanvas::pushBufferToPlaceholder()
{
callOnMainThread([placeholderData = Ref { *m_placeholderData }] () mutable {
Locker locker { placeholderData->bufferLock };
if (placeholderData->canvas && placeholderData->pendingCommitBuffer)
placeholderData->canvas->setImageBufferAndMarkDirty(WTFMove(placeholderData->pendingCommitBuffer));
placeholderData->pendingCommitBuffer = nullptr;
});
}
void OffscreenCanvas::commitToPlaceholderCanvas()
{
auto* imageBuffer = buffer();
if (!imageBuffer)
return;
// FIXME: Transfer texture over if we're using accelerated compositing
if (m_context && (m_context->isWebGL() || m_context->isAccelerated()))
m_context->paintRenderingResultsToCanvas();
if (m_placeholderData->bufferPipeSource) {
auto bufferCopy = imageBuffer->copyRectToBuffer(FloatRect(FloatPoint(), imageBuffer->logicalSize()), DestinationColorSpace::SRGB(), imageBuffer->context());
if (bufferCopy)
m_placeholderData->bufferPipeSource->handle(WTFMove(bufferCopy));
}
Locker locker { m_placeholderData->bufferLock };
bool shouldPushBuffer = !m_placeholderData->pendingCommitBuffer;
m_placeholderData->pendingCommitBuffer = imageBuffer->copyRectToBuffer(FloatRect(FloatPoint(), imageBuffer->logicalSize()), DestinationColorSpace::SRGB(), imageBuffer->context());
if (m_placeholderData->pendingCommitBuffer && shouldPushBuffer)
pushBufferToPlaceholder();
}
void OffscreenCanvas::scheduleCommitToPlaceholderCanvas()
{
if (!m_hasScheduledCommit) {
auto& scriptContext = *scriptExecutionContext();
m_hasScheduledCommit = true;
scriptContext.postTask([protectedThis = Ref { *this }, this] (ScriptExecutionContext&) {
m_hasScheduledCommit = false;
commitToPlaceholderCanvas();
});
}
}
CSSValuePool& OffscreenCanvas::cssValuePool()
{
auto* scriptExecutionContext = canvasBaseScriptExecutionContext();
if (scriptExecutionContext->isWorkerGlobalScope())
return downcast<WorkerGlobalScope>(*scriptExecutionContext).cssValuePool();
ASSERT(scriptExecutionContext->isDocument());
return CSSValuePool::singleton();
}
void OffscreenCanvas::createImageBuffer() const
{
m_hasCreatedImageBuffer = true;
if (!width() || !height())
return;
auto colorSpace = m_context ? m_context->colorSpace() : DestinationColorSpace::SRGB();
setImageBuffer(ImageBitmap::createImageBuffer(*canvasBaseScriptExecutionContext(), size(), RenderingMode::Unaccelerated, colorSpace));
}
RefPtr<ImageBuffer> OffscreenCanvas::takeImageBuffer() const
{
ASSERT(m_detached);
if (size().isEmpty())
return nullptr;
clearCopiedImage();
return setImageBuffer(nullptr);
}
void OffscreenCanvas::reset()
{
resetGraphicsContextState();
if (is<OffscreenCanvasRenderingContext2D>(m_context))
downcast<OffscreenCanvasRenderingContext2D>(*m_context).reset();
m_hasCreatedImageBuffer = false;
setImageBuffer(nullptr);
clearCopiedImage();
notifyObserversCanvasResized();
scheduleCommitToPlaceholderCanvas();
}
}
#endif