| /* |
| * Copyright (C) 2011 Apple Inc. All rights reserved. |
| * Copyright (C) 2013 Google 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 COMPUTER, 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 "core/rendering/FilterEffectRenderer.h" |
| |
| #include "core/fetch/DocumentResource.h" |
| #include "core/fetch/DocumentResourceReference.h" |
| #include "core/page/Page.h" |
| #include "core/rendering/RenderLayer.h" |
| #include "core/rendering/RenderView.h" |
| #include "core/rendering/svg/ReferenceFilterBuilder.h" |
| #include "core/svg/SVGElement.h" |
| #include "core/svg/SVGFilterPrimitiveStandardAttributes.h" |
| #include "platform/FloatConversion.h" |
| #include "platform/LengthFunctions.h" |
| #include "platform/graphics/ColorSpace.h" |
| #include "platform/graphics/UnacceleratedImageBufferSurface.h" |
| #include "platform/graphics/filters/FEColorMatrix.h" |
| #include "platform/graphics/filters/FEComponentTransfer.h" |
| #include "platform/graphics/filters/FEDropShadow.h" |
| #include "platform/graphics/filters/FEGaussianBlur.h" |
| #include "wtf/MathExtras.h" |
| #include <algorithm> |
| |
| namespace blink { |
| |
| static inline void endMatrixRow(Vector<float>& parameters) |
| { |
| parameters.append(0); |
| parameters.append(0); |
| } |
| |
| static inline void lastMatrixRow(Vector<float>& parameters) |
| { |
| parameters.append(0); |
| parameters.append(0); |
| parameters.append(0); |
| parameters.append(1); |
| parameters.append(0); |
| } |
| |
| FilterEffectRenderer::FilterEffectRenderer() |
| : Filter(AffineTransform()) |
| , m_graphicsBufferAttached(false) |
| , m_hasFilterThatMovesPixels(false) |
| { |
| m_sourceGraphic = SourceGraphic::create(this); |
| } |
| |
| FilterEffectRenderer::~FilterEffectRenderer() |
| { |
| } |
| |
| GraphicsContext* FilterEffectRenderer::inputContext() |
| { |
| return sourceImage() ? sourceImage()->context() : 0; |
| } |
| |
| bool FilterEffectRenderer::build(RenderObject* renderer, const FilterOperations& operations) |
| { |
| m_hasFilterThatMovesPixels = operations.hasFilterThatMovesPixels(); |
| |
| // Inverse zoom the pre-zoomed CSS shorthand filters, so that they are in the same zoom as the unzoomed reference filters. |
| const RenderStyle* style = renderer->style(); |
| float invZoom = style ? 1.0f / style->effectiveZoom() : 1.0f; |
| |
| RefPtr<FilterEffect> previousEffect = m_sourceGraphic; |
| for (size_t i = 0; i < operations.operations().size(); ++i) { |
| RefPtr<FilterEffect> effect; |
| FilterOperation* filterOperation = operations.operations().at(i).get(); |
| switch (filterOperation->type()) { |
| case FilterOperation::REFERENCE: { |
| effect = ReferenceFilterBuilder::build(this, renderer, previousEffect.get(), toReferenceFilterOperation(filterOperation)); |
| break; |
| } |
| case FilterOperation::GRAYSCALE: { |
| Vector<float> inputParameters; |
| double oneMinusAmount = clampTo(1 - toBasicColorMatrixFilterOperation(filterOperation)->amount(), 0.0, 1.0); |
| |
| // See https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#grayscaleEquivalent |
| // for information on parameters. |
| |
| inputParameters.append(narrowPrecisionToFloat(0.2126 + 0.7874 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.7152 - 0.7152 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.0722 - 0.0722 * oneMinusAmount)); |
| endMatrixRow(inputParameters); |
| |
| inputParameters.append(narrowPrecisionToFloat(0.2126 - 0.2126 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.7152 + 0.2848 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.0722 - 0.0722 * oneMinusAmount)); |
| endMatrixRow(inputParameters); |
| |
| inputParameters.append(narrowPrecisionToFloat(0.2126 - 0.2126 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.7152 - 0.7152 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.0722 + 0.9278 * oneMinusAmount)); |
| endMatrixRow(inputParameters); |
| |
| lastMatrixRow(inputParameters); |
| |
| effect = FEColorMatrix::create(this, FECOLORMATRIX_TYPE_MATRIX, inputParameters); |
| break; |
| } |
| case FilterOperation::SEPIA: { |
| Vector<float> inputParameters; |
| double oneMinusAmount = clampTo(1 - toBasicColorMatrixFilterOperation(filterOperation)->amount(), 0.0, 1.0); |
| |
| // See https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#sepiaEquivalent |
| // for information on parameters. |
| |
| inputParameters.append(narrowPrecisionToFloat(0.393 + 0.607 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.769 - 0.769 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.189 - 0.189 * oneMinusAmount)); |
| endMatrixRow(inputParameters); |
| |
| inputParameters.append(narrowPrecisionToFloat(0.349 - 0.349 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.686 + 0.314 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.168 - 0.168 * oneMinusAmount)); |
| endMatrixRow(inputParameters); |
| |
| inputParameters.append(narrowPrecisionToFloat(0.272 - 0.272 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.534 - 0.534 * oneMinusAmount)); |
| inputParameters.append(narrowPrecisionToFloat(0.131 + 0.869 * oneMinusAmount)); |
| endMatrixRow(inputParameters); |
| |
| lastMatrixRow(inputParameters); |
| |
| effect = FEColorMatrix::create(this, FECOLORMATRIX_TYPE_MATRIX, inputParameters); |
| break; |
| } |
| case FilterOperation::SATURATE: { |
| Vector<float> inputParameters; |
| inputParameters.append(narrowPrecisionToFloat(toBasicColorMatrixFilterOperation(filterOperation)->amount())); |
| effect = FEColorMatrix::create(this, FECOLORMATRIX_TYPE_SATURATE, inputParameters); |
| break; |
| } |
| case FilterOperation::HUE_ROTATE: { |
| Vector<float> inputParameters; |
| inputParameters.append(narrowPrecisionToFloat(toBasicColorMatrixFilterOperation(filterOperation)->amount())); |
| effect = FEColorMatrix::create(this, FECOLORMATRIX_TYPE_HUEROTATE, inputParameters); |
| break; |
| } |
| case FilterOperation::INVERT: { |
| BasicComponentTransferFilterOperation* componentTransferOperation = toBasicComponentTransferFilterOperation(filterOperation); |
| ComponentTransferFunction transferFunction; |
| transferFunction.type = FECOMPONENTTRANSFER_TYPE_TABLE; |
| Vector<float> transferParameters; |
| transferParameters.append(narrowPrecisionToFloat(componentTransferOperation->amount())); |
| transferParameters.append(narrowPrecisionToFloat(1 - componentTransferOperation->amount())); |
| transferFunction.tableValues = transferParameters; |
| |
| ComponentTransferFunction nullFunction; |
| effect = FEComponentTransfer::create(this, transferFunction, transferFunction, transferFunction, nullFunction); |
| break; |
| } |
| case FilterOperation::OPACITY: { |
| ComponentTransferFunction transferFunction; |
| transferFunction.type = FECOMPONENTTRANSFER_TYPE_TABLE; |
| Vector<float> transferParameters; |
| transferParameters.append(0); |
| transferParameters.append(narrowPrecisionToFloat(toBasicComponentTransferFilterOperation(filterOperation)->amount())); |
| transferFunction.tableValues = transferParameters; |
| |
| ComponentTransferFunction nullFunction; |
| effect = FEComponentTransfer::create(this, nullFunction, nullFunction, nullFunction, transferFunction); |
| break; |
| } |
| case FilterOperation::BRIGHTNESS: { |
| ComponentTransferFunction transferFunction; |
| transferFunction.type = FECOMPONENTTRANSFER_TYPE_LINEAR; |
| transferFunction.slope = narrowPrecisionToFloat(toBasicComponentTransferFilterOperation(filterOperation)->amount()); |
| transferFunction.intercept = 0; |
| |
| ComponentTransferFunction nullFunction; |
| effect = FEComponentTransfer::create(this, transferFunction, transferFunction, transferFunction, nullFunction); |
| break; |
| } |
| case FilterOperation::CONTRAST: { |
| ComponentTransferFunction transferFunction; |
| transferFunction.type = FECOMPONENTTRANSFER_TYPE_LINEAR; |
| float amount = narrowPrecisionToFloat(toBasicComponentTransferFilterOperation(filterOperation)->amount()); |
| transferFunction.slope = amount; |
| transferFunction.intercept = -0.5 * amount + 0.5; |
| |
| ComponentTransferFunction nullFunction; |
| effect = FEComponentTransfer::create(this, transferFunction, transferFunction, transferFunction, nullFunction); |
| break; |
| } |
| case FilterOperation::BLUR: { |
| float stdDeviation = floatValueForLength(toBlurFilterOperation(filterOperation)->stdDeviation(), 0) * invZoom; |
| effect = FEGaussianBlur::create(this, stdDeviation, stdDeviation); |
| break; |
| } |
| case FilterOperation::DROP_SHADOW: { |
| DropShadowFilterOperation* dropShadowOperation = toDropShadowFilterOperation(filterOperation); |
| float stdDeviation = dropShadowOperation->stdDeviation() * invZoom; |
| float x = dropShadowOperation->x() * invZoom; |
| float y = dropShadowOperation->y() * invZoom; |
| effect = FEDropShadow::create(this, stdDeviation, stdDeviation, x, y, dropShadowOperation->color(), 1); |
| break; |
| } |
| default: |
| break; |
| } |
| |
| if (effect) { |
| if (filterOperation->type() != FilterOperation::REFERENCE) { |
| // Unlike SVG, filters applied here should not clip to their primitive subregions. |
| effect->setClipsToBounds(false); |
| effect->setOperatingColorSpace(ColorSpaceDeviceRGB); |
| effect->inputEffects().append(previousEffect); |
| } |
| previousEffect = effect.release(); |
| } |
| } |
| |
| // We need to keep the old effects alive until this point, so that SVG reference filters |
| // can share cached resources across frames. |
| m_lastEffect = previousEffect; |
| |
| // If we didn't make any effects, tell our caller we are not valid |
| if (!m_lastEffect.get()) |
| return false; |
| |
| return true; |
| } |
| |
| bool FilterEffectRenderer::updateBackingStoreRect(const FloatRect& floatFilterRect) |
| { |
| IntRect filterRect = enclosingIntRect(floatFilterRect); |
| if (!filterRect.isEmpty() && FilterEffect::isFilterSizeValid(filterRect)) { |
| FloatRect currentSourceRect = sourceImageRect(); |
| if (filterRect != currentSourceRect) { |
| setSourceImageRect(filterRect); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void FilterEffectRenderer::allocateBackingStoreIfNeeded() |
| { |
| // At this point the effect chain has been built, and the |
| // source image sizes set. We just need to attach the graphic |
| // buffer if we have not yet done so. |
| if (!m_graphicsBufferAttached) { |
| IntSize logicalSize(m_sourceDrawingRegion.width(), m_sourceDrawingRegion.height()); |
| if (!sourceImage() || sourceImage()->size() != logicalSize) { |
| OwnPtr<ImageBufferSurface> surface = adoptPtr(new UnacceleratedImageBufferSurface(logicalSize)); |
| setSourceImage(ImageBuffer::create(surface.release())); |
| } |
| m_graphicsBufferAttached = true; |
| } |
| } |
| |
| void FilterEffectRenderer::clearIntermediateResults() |
| { |
| if (m_lastEffect.get()) |
| m_lastEffect->clearResultsRecursive(); |
| } |
| |
| void FilterEffectRenderer::apply() |
| { |
| RefPtr<FilterEffect> effect = lastEffect(); |
| effect->apply(); |
| effect->transformResultColorSpace(ColorSpaceDeviceRGB); |
| } |
| |
| LayoutRect FilterEffectRenderer::computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect) |
| { |
| // The result of this function is the area in the "filterBoxRect" that needs to be repainted, so that we fully cover the "dirtyRect". |
| FloatRect rectForRepaint = dirtyRect; |
| float inf = std::numeric_limits<float>::infinity(); |
| FloatRect clipRect = FloatRect(FloatPoint(-inf, -inf), FloatSize(inf, inf)); |
| rectForRepaint = lastEffect()->getSourceRect(rectForRepaint, clipRect); |
| rectForRepaint.intersect(filterBoxRect); |
| return LayoutRect(rectForRepaint); |
| } |
| |
| bool FilterEffectRendererHelper::prepareFilterEffect(RenderLayer* renderLayer, const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect) |
| { |
| ASSERT(m_haveFilterEffect && renderLayer->filterRenderer()); |
| m_renderLayer = renderLayer; |
| m_repaintRect = dirtyRect; |
| |
| // Get the zoom factor to scale the filterSourceRect input |
| const RenderLayerModelObject* renderer = renderLayer->renderer(); |
| const RenderStyle* style = renderer ? renderer->style() : 0; |
| float zoom = style ? style->effectiveZoom() : 1.0f; |
| |
| // Prepare a transformation that brings the coordinates into the space |
| // filter coordinates are defined in. |
| AffineTransform absoluteTransform; |
| // FIXME: Should these really be upconverted to doubles and not rounded? crbug.com/350474 |
| absoluteTransform.translate(filterBoxRect.x().toDouble(), filterBoxRect.y().toDouble()); |
| absoluteTransform.scale(zoom, zoom); |
| |
| FilterEffectRenderer* filter = renderLayer->filterRenderer(); |
| filter->setAbsoluteTransform(absoluteTransform); |
| |
| IntRect filterSourceRect = pixelSnappedIntRect(filter->computeSourceImageRectForDirtyRect(filterBoxRect, dirtyRect)); |
| |
| if (filterSourceRect.isEmpty()) { |
| // The dirty rect is not in view, just bail out. |
| m_haveFilterEffect = false; |
| return false; |
| } |
| |
| filter->setFilterRegion(filter->mapAbsoluteRectToLocalRect(filterSourceRect)); |
| filter->lastEffect()->determineFilterPrimitiveSubregion(MapRectForward); |
| |
| bool hasUpdatedBackingStore = filter->updateBackingStoreRect(filterSourceRect); |
| if (filter->hasFilterThatMovesPixels()) { |
| if (hasUpdatedBackingStore) |
| m_repaintRect = filterSourceRect; |
| else |
| m_repaintRect.intersect(filterSourceRect); |
| } |
| return true; |
| } |
| |
| GraphicsContext* FilterEffectRendererHelper::beginFilterEffect(GraphicsContext* oldContext) |
| { |
| ASSERT(m_renderLayer); |
| |
| FilterEffectRenderer* filter = m_renderLayer->filterRenderer(); |
| filter->allocateBackingStoreIfNeeded(); |
| // Paint into the context that represents the SourceGraphic of the filter. |
| GraphicsContext* sourceGraphicsContext = filter->inputContext(); |
| if (!sourceGraphicsContext || !FilterEffect::isFilterSizeValid(filter->absoluteFilterRegion())) { |
| // Disable the filters and continue. |
| m_haveFilterEffect = false; |
| return oldContext; |
| } |
| |
| m_savedGraphicsContext = oldContext; |
| |
| // Translate the context so that the contents of the layer is captuterd in the offscreen memory buffer. |
| sourceGraphicsContext->save(); |
| // FIXME: can we just use sourceImageRect for everything, and get rid of |
| // m_repaintRect? |
| FloatPoint offset = filter->sourceImageRect().location(); |
| sourceGraphicsContext->translate(-offset.x(), -offset.y()); |
| sourceGraphicsContext->clearRect(m_repaintRect); |
| sourceGraphicsContext->clip(m_repaintRect); |
| |
| return sourceGraphicsContext; |
| } |
| |
| GraphicsContext* FilterEffectRendererHelper::applyFilterEffect() |
| { |
| ASSERT(m_haveFilterEffect && m_renderLayer->filterRenderer()); |
| FilterEffectRenderer* filter = m_renderLayer->filterRenderer(); |
| filter->inputContext()->restore(); |
| |
| filter->apply(); |
| |
| // Get the filtered output and draw it in place. |
| m_savedGraphicsContext->drawImageBuffer(filter->output(), filter->outputRect()); |
| |
| filter->clearIntermediateResults(); |
| |
| return m_savedGraphicsContext; |
| } |
| |
| } // namespace blink |
| |
