void HTMLCanvasElement::createImageBuffer() const
{
ASSERT(!m_imageBuffer);
m_hasCreatedImageBuffer = true;
m_didClearImageBuffer = true;
FloatSize logicalSize = size();
FloatSize deviceSize = convertLogicalToDevice(logicalSize);
if (!deviceSize.isExpressibleAsIntSize())
return;
if (deviceSize.width() * deviceSize.height() > MaxCanvasArea) {
StringBuilder stringBuilder;
stringBuilder.appendLiteral("Canvas area exceeds the maximum limit (width * height > ");
stringBuilder.appendNumber(MaxCanvasArea);
stringBuilder.appendLiteral(").");
document().addConsoleMessage(MessageSource::JS, MessageLevel::Warning, stringBuilder.toString());
return;
}
// Make sure we don't use more pixel memory than the system can support.
size_t requestedPixelMemory = 4 * width() * height();
if (activePixelMemory + requestedPixelMemory > maxActivePixelMemory()) {
StringBuilder stringBuilder;
stringBuilder.appendLiteral("Total canvas memory use exceeds the maximum limit (");
stringBuilder.appendNumber(maxActivePixelMemory() / 1024 / 1024);
stringBuilder.appendLiteral(" MB).");
document().addConsoleMessage(MessageSource::JS, MessageLevel::Warning, stringBuilder.toString());
return;
}
IntSize bufferSize(deviceSize.width(), deviceSize.height());
if (!bufferSize.width() || !bufferSize.height())
return;
RenderingMode renderingMode = shouldAccelerate(bufferSize) ? Accelerated : Unaccelerated;
setImageBuffer(ImageBuffer::create(size(), renderingMode));
if (!m_imageBuffer)
return;
m_imageBuffer->context().setShadowsIgnoreTransforms(true);
m_imageBuffer->context().setImageInterpolationQuality(DefaultInterpolationQuality);
if (document().settings() && !document().settings()->antialiased2dCanvasEnabled())
m_imageBuffer->context().setShouldAntialias(false);
m_imageBuffer->context().setStrokeThickness(1);
m_contextStateSaver = std::make_unique<GraphicsContextStateSaver>(m_imageBuffer->context());
JSC::JSLockHolder lock(scriptExecutionContext()->vm());
scriptExecutionContext()->vm().heap.reportExtraMemoryAllocated(memoryCost());
#if USE(IOSURFACE_CANVAS_BACKING_STORE) || ENABLE(ACCELERATED_2D_CANVAS)
if (m_context && m_context->is2d())
// Recalculate compositing requirements if acceleration state changed.
const_cast<HTMLCanvasElement*>(this)->setNeedsStyleRecalc(SyntheticStyleChange);
#endif
}
void HTMLCanvasElement::createImageBuffer() const
{
ASSERT(!m_imageBuffer);
m_hasCreatedImageBuffer = true;
m_didClearImageBuffer = true;
FloatSize logicalSize(width(), height());
FloatSize deviceSize = convertLogicalToDevice(logicalSize);
if (!deviceSize.isExpressibleAsIntSize())
return;
if (deviceSize.width() * deviceSize.height() > MaxCanvasArea)
return;
#if USE(SKIA)
if (deviceSize.width() > MaxSkiaDim || deviceSize.height() > MaxSkiaDim)
return;
#endif
IntSize bufferSize(deviceSize.width(), deviceSize.height());
if (!bufferSize.width() || !bufferSize.height())
return;
RenderingMode renderingMode = shouldAccelerate(bufferSize) ? Accelerated :
#if USE(SKIA)
UnacceleratedNonPlatformBuffer;
#else
Unaccelerated;
#endif
m_imageBuffer = ImageBuffer::create(bufferSize, ColorSpaceDeviceRGB, renderingMode);
if (!m_imageBuffer)
return;
m_imageBuffer->context()->scale(FloatSize(bufferSize.width() / logicalSize.width(), bufferSize.height() / logicalSize.height()));
m_imageBuffer->context()->setShadowsIgnoreTransforms(true);
m_imageBuffer->context()->setImageInterpolationQuality(DefaultInterpolationQuality);
m_imageBuffer->context()->setStrokeThickness(1);
m_contextStateSaver = adoptPtr(new GraphicsContextStateSaver(*m_imageBuffer->context()));
#if USE(JSC)
JSC::JSLock lock(JSC::SilenceAssertionsOnly);
scriptExecutionContext()->globalData()->heap.reportExtraMemoryCost(m_imageBuffer->dataSize());
#endif
#if USE(IOSURFACE_CANVAS_BACKING_STORE) || (ENABLE(ACCELERATED_2D_CANVAS) && USE(ACCELERATED_COMPOSITING))
if (m_context && m_context->is2d())
// Recalculate compositing requirements if acceleration state changed.
const_cast<HTMLCanvasElement*>(this)->setNeedsStyleRecalc(SyntheticStyleChange);
#endif
}
void HTMLCanvasElement::createImageBuffer() const
{
ASSERT(!m_imageBuffer);
m_hasCreatedImageBuffer = true;
m_didClearImageBuffer = true;
FloatSize logicalSize = size();
FloatSize deviceSize = convertLogicalToDevice(logicalSize);
if (!deviceSize.isExpressibleAsIntSize())
return;
#if PLATFORM(IOS)
if (deviceSize.width() * deviceSize.height() * 4 > m_maximumDecodedImageSize)
return;
#else
if (deviceSize.width() * deviceSize.height() > MaxCanvasArea)
return;
#endif
IntSize bufferSize(deviceSize.width(), deviceSize.height());
if (!bufferSize.width() || !bufferSize.height())
return;
RenderingMode renderingMode = shouldAccelerate(bufferSize) ? Accelerated : Unaccelerated;
m_imageBuffer = ImageBuffer::create(size(), m_deviceScaleFactor, ColorSpaceDeviceRGB, renderingMode);
if (!m_imageBuffer)
return;
m_imageBuffer->context()->setShadowsIgnoreTransforms(true);
m_imageBuffer->context()->setImageInterpolationQuality(DefaultInterpolationQuality);
if (document().settings() && !document().settings()->antialiased2dCanvasEnabled())
m_imageBuffer->context()->setShouldAntialias(false);
m_imageBuffer->context()->setStrokeThickness(1);
m_contextStateSaver = adoptPtr(new GraphicsContextStateSaver(*m_imageBuffer->context()));
JSC::JSLockHolder lock(scriptExecutionContext()->vm());
size_t numBytes = 4 * m_imageBuffer->internalSize().width() * m_imageBuffer->internalSize().height();
scriptExecutionContext()->vm()->heap.reportExtraMemoryCost(numBytes);
#if USE(IOSURFACE_CANVAS_BACKING_STORE) || ENABLE(ACCELERATED_2D_CANVAS)
if (m_context && m_context->is2d())
// Recalculate compositing requirements if acceleration state changed.
const_cast<HTMLCanvasElement*>(this)->setNeedsStyleRecalc(SyntheticStyleChange);
#endif
}