зеркало из https://github.com/mozilla/gecko-dev.git
400 строки
14 KiB
C++
400 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Main header first:
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#include "nsCSSFilterInstance.h"
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// Keep others in (case-insensitive) order:
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#include "gfx2DGlue.h"
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#include "gfxUtils.h"
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#include "nsIFrame.h"
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#include "nsStyleStruct.h"
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#include "nsTArray.h"
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using namespace mozilla;
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using namespace mozilla::gfx;
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static float ClampFactor(float aFactor)
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{
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if (aFactor > 1) {
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return 1;
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} else if (aFactor < 0) {
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NS_NOTREACHED("A negative value should not have been parsed.");
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return 0;
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}
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return aFactor;
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}
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nsCSSFilterInstance::nsCSSFilterInstance(const nsStyleFilter& aFilter,
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nscolor aShadowFallbackColor,
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const nsIntRect& aTargetBoundsInFilterSpace,
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const gfxMatrix& aFrameSpaceInCSSPxToFilterSpaceTransform)
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: mFilter(aFilter)
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, mShadowFallbackColor(aShadowFallbackColor)
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, mTargetBoundsInFilterSpace(aTargetBoundsInFilterSpace)
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, mFrameSpaceInCSSPxToFilterSpaceTransform(aFrameSpaceInCSSPxToFilterSpaceTransform)
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{
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}
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nsresult
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nsCSSFilterInstance::BuildPrimitives(nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs)
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{
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FilterPrimitiveDescription descr;
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nsresult result;
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switch(mFilter.GetType()) {
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case NS_STYLE_FILTER_BLUR:
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descr = CreatePrimitiveDescription(PrimitiveType::GaussianBlur, aPrimitiveDescrs);
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result = SetAttributesForBlur(descr);
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break;
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case NS_STYLE_FILTER_BRIGHTNESS:
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descr = CreatePrimitiveDescription(PrimitiveType::ComponentTransfer, aPrimitiveDescrs);
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result = SetAttributesForBrightness(descr);
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break;
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case NS_STYLE_FILTER_CONTRAST:
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descr = CreatePrimitiveDescription(PrimitiveType::ComponentTransfer, aPrimitiveDescrs);
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result = SetAttributesForContrast(descr);
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break;
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case NS_STYLE_FILTER_DROP_SHADOW:
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descr = CreatePrimitiveDescription(PrimitiveType::DropShadow, aPrimitiveDescrs);
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result = SetAttributesForDropShadow(descr);
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break;
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case NS_STYLE_FILTER_GRAYSCALE:
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descr = CreatePrimitiveDescription(PrimitiveType::ColorMatrix, aPrimitiveDescrs);
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result = SetAttributesForGrayscale(descr);
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break;
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case NS_STYLE_FILTER_HUE_ROTATE:
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descr = CreatePrimitiveDescription(PrimitiveType::ColorMatrix, aPrimitiveDescrs);
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result = SetAttributesForHueRotate(descr);
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break;
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case NS_STYLE_FILTER_INVERT:
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descr = CreatePrimitiveDescription(PrimitiveType::ComponentTransfer, aPrimitiveDescrs);
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result = SetAttributesForInvert(descr);
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break;
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case NS_STYLE_FILTER_OPACITY:
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descr = CreatePrimitiveDescription(PrimitiveType::ComponentTransfer, aPrimitiveDescrs);
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result = SetAttributesForOpacity(descr);
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break;
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case NS_STYLE_FILTER_SATURATE:
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descr = CreatePrimitiveDescription(PrimitiveType::ColorMatrix, aPrimitiveDescrs);
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result = SetAttributesForSaturate(descr);
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break;
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case NS_STYLE_FILTER_SEPIA:
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descr = CreatePrimitiveDescription(PrimitiveType::ColorMatrix, aPrimitiveDescrs);
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result = SetAttributesForSepia(descr);
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break;
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default:
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NS_NOTREACHED("not a valid CSS filter type");
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return NS_ERROR_FAILURE;
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}
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if (NS_FAILED(result)) {
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return result;
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}
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// Compute the primitive's bounds now that we've determined its attributes.
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// Some attributes like blur radius can influence the bounds.
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SetBounds(descr, aPrimitiveDescrs);
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// Add this primitive to the filter chain.
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aPrimitiveDescrs.AppendElement(descr);
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return NS_OK;
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}
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FilterPrimitiveDescription
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nsCSSFilterInstance::CreatePrimitiveDescription(PrimitiveType aType,
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs) {
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FilterPrimitiveDescription descr(aType);
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int32_t inputIndex = GetLastResultIndex(aPrimitiveDescrs);
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descr.SetInputPrimitive(0, inputIndex);
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descr.SetIsTainted(inputIndex < 0 ? true : aPrimitiveDescrs[inputIndex].IsTainted());
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descr.SetInputColorSpace(0, ColorSpace::SRGB);
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descr.SetOutputColorSpace(ColorSpace::SRGB);
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return descr;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForBlur(FilterPrimitiveDescription& aDescr)
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{
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const nsStyleCoord& radiusInFrameSpace = mFilter.GetFilterParameter();
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if (radiusInFrameSpace.GetUnit() != eStyleUnit_Coord) {
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NS_NOTREACHED("unexpected unit");
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return NS_ERROR_FAILURE;
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}
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Size radiusInFilterSpace = BlurRadiusToFilterSpace(radiusInFrameSpace.GetCoordValue());
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aDescr.Attributes().Set(eGaussianBlurStdDeviation, radiusInFilterSpace);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForBrightness(FilterPrimitiveDescription& aDescr)
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{
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = styleValue.GetFactorOrPercentValue();
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// Set transfer functions for RGB.
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AttributeMap brightnessAttrs;
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brightnessAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_LINEAR);
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brightnessAttrs.Set(eComponentTransferFunctionSlope, value);
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brightnessAttrs.Set(eComponentTransferFunctionIntercept, 0.0f);
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aDescr.Attributes().Set(eComponentTransferFunctionR, brightnessAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionG, brightnessAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionB, brightnessAttrs);
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// Set identity transfer function for A.
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AttributeMap identityAttrs;
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identityAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY);
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aDescr.Attributes().Set(eComponentTransferFunctionA, identityAttrs);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForContrast(FilterPrimitiveDescription& aDescr)
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{
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = styleValue.GetFactorOrPercentValue();
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float intercept = -(0.5 * value) + 0.5;
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// Set transfer functions for RGB.
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AttributeMap contrastAttrs;
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contrastAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_LINEAR);
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contrastAttrs.Set(eComponentTransferFunctionSlope, value);
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contrastAttrs.Set(eComponentTransferFunctionIntercept, intercept);
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aDescr.Attributes().Set(eComponentTransferFunctionR, contrastAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionG, contrastAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionB, contrastAttrs);
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// Set identity transfer function for A.
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AttributeMap identityAttrs;
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identityAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY);
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aDescr.Attributes().Set(eComponentTransferFunctionA, identityAttrs);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForDropShadow(FilterPrimitiveDescription& aDescr)
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{
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nsCSSShadowArray* shadows = mFilter.GetDropShadow();
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if (!shadows || shadows->Length() != 1) {
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NS_NOTREACHED("Exactly one drop shadow should have been parsed.");
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return NS_ERROR_FAILURE;
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}
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nsCSSShadowItem* shadow = shadows->ShadowAt(0);
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// Set drop shadow blur radius.
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Size radiusInFilterSpace = BlurRadiusToFilterSpace(shadow->mRadius);
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aDescr.Attributes().Set(eDropShadowStdDeviation, radiusInFilterSpace);
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// Set offset.
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IntPoint offsetInFilterSpace = OffsetToFilterSpace(shadow->mXOffset, shadow->mYOffset);
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aDescr.Attributes().Set(eDropShadowOffset, offsetInFilterSpace);
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// Set color. If unspecified, use the CSS color property.
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nscolor shadowColor = shadow->mHasColor ? shadow->mColor : mShadowFallbackColor;
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aDescr.Attributes().Set(eDropShadowColor, ToAttributeColor(shadowColor));
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForGrayscale(FilterPrimitiveDescription& aDescr)
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{
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// Set color matrix type.
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aDescr.Attributes().Set(eColorMatrixType, (uint32_t)SVG_FECOLORMATRIX_TYPE_SATURATE);
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// Set color matrix values.
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = 1 - ClampFactor(styleValue.GetFactorOrPercentValue());
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aDescr.Attributes().Set(eColorMatrixValues, &value, 1);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForHueRotate(FilterPrimitiveDescription& aDescr)
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{
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// Set color matrix type.
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aDescr.Attributes().Set(eColorMatrixType, (uint32_t)SVG_FECOLORMATRIX_TYPE_HUE_ROTATE);
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// Set color matrix values.
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = styleValue.GetAngleValueInDegrees();
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aDescr.Attributes().Set(eColorMatrixValues, &value, 1);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForInvert(FilterPrimitiveDescription& aDescr)
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{
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = ClampFactor(styleValue.GetFactorOrPercentValue());
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// Set transfer functions for RGB.
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AttributeMap invertAttrs;
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float invertTableValues[2];
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invertTableValues[0] = value;
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invertTableValues[1] = 1 - value;
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invertAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_TABLE);
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invertAttrs.Set(eComponentTransferFunctionTableValues, invertTableValues, 2);
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aDescr.Attributes().Set(eComponentTransferFunctionR, invertAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionG, invertAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionB, invertAttrs);
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// Set identity transfer function for A.
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AttributeMap identityAttrs;
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identityAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY);
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aDescr.Attributes().Set(eComponentTransferFunctionA, identityAttrs);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForOpacity(FilterPrimitiveDescription& aDescr)
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{
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = ClampFactor(styleValue.GetFactorOrPercentValue());
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// Set identity transfer functions for RGB.
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AttributeMap identityAttrs;
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identityAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY);
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aDescr.Attributes().Set(eComponentTransferFunctionR, identityAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionG, identityAttrs);
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aDescr.Attributes().Set(eComponentTransferFunctionB, identityAttrs);
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// Set transfer function for A.
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AttributeMap opacityAttrs;
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float opacityTableValues[2];
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opacityTableValues[0] = 0;
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opacityTableValues[1] = value;
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opacityAttrs.Set(eComponentTransferFunctionType,
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(uint32_t)SVG_FECOMPONENTTRANSFER_TYPE_TABLE);
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opacityAttrs.Set(eComponentTransferFunctionTableValues, opacityTableValues, 2);
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aDescr.Attributes().Set(eComponentTransferFunctionA, opacityAttrs);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForSaturate(FilterPrimitiveDescription& aDescr)
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{
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// Set color matrix type.
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aDescr.Attributes().Set(eColorMatrixType, (uint32_t)SVG_FECOLORMATRIX_TYPE_SATURATE);
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// Set color matrix values.
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = styleValue.GetFactorOrPercentValue();
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aDescr.Attributes().Set(eColorMatrixValues, &value, 1);
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return NS_OK;
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}
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nsresult
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nsCSSFilterInstance::SetAttributesForSepia(FilterPrimitiveDescription& aDescr)
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{
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// Set color matrix type.
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aDescr.Attributes().Set(eColorMatrixType, (uint32_t)SVG_FECOLORMATRIX_TYPE_SEPIA);
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// Set color matrix values.
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const nsStyleCoord& styleValue = mFilter.GetFilterParameter();
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float value = ClampFactor(styleValue.GetFactorOrPercentValue());
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aDescr.Attributes().Set(eColorMatrixValues, &value, 1);
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return NS_OK;
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}
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Size
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nsCSSFilterInstance::BlurRadiusToFilterSpace(nscoord aRadiusInFrameSpace)
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{
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float radiusInFrameSpaceInCSSPx =
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nsPresContext::AppUnitsToFloatCSSPixels(aRadiusInFrameSpace);
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// Convert the radius to filter space.
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gfxSize radiusInFilterSpace(radiusInFrameSpaceInCSSPx,
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radiusInFrameSpaceInCSSPx);
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gfxSize frameSpaceInCSSPxToFilterSpaceScale =
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mFrameSpaceInCSSPxToFilterSpaceTransform.ScaleFactors(true);
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radiusInFilterSpace.Scale(frameSpaceInCSSPxToFilterSpaceScale.width,
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frameSpaceInCSSPxToFilterSpaceScale.height);
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// Check the radius limits.
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if (radiusInFilterSpace.width < 0 || radiusInFilterSpace.height < 0) {
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NS_NOTREACHED("we shouldn't have parsed a negative radius in the style");
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return Size();
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}
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gfxFloat maxStdDeviation = (gfxFloat)kMaxStdDeviation;
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radiusInFilterSpace.width = std::min(radiusInFilterSpace.width, maxStdDeviation);
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radiusInFilterSpace.height = std::min(radiusInFilterSpace.height, maxStdDeviation);
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return ToSize(radiusInFilterSpace);
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}
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IntPoint
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nsCSSFilterInstance::OffsetToFilterSpace(nscoord aXOffsetInFrameSpace,
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nscoord aYOffsetInFrameSpace)
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{
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gfxPoint offsetInFilterSpace(nsPresContext::AppUnitsToFloatCSSPixels(aXOffsetInFrameSpace),
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nsPresContext::AppUnitsToFloatCSSPixels(aYOffsetInFrameSpace));
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// Convert the radius to filter space.
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gfxSize frameSpaceInCSSPxToFilterSpaceScale =
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mFrameSpaceInCSSPxToFilterSpaceTransform.ScaleFactors(true);
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offsetInFilterSpace.x *= frameSpaceInCSSPxToFilterSpaceScale.width;
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offsetInFilterSpace.y *= frameSpaceInCSSPxToFilterSpaceScale.height;
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return IntPoint(int32_t(offsetInFilterSpace.x), int32_t(offsetInFilterSpace.y));
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}
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Color
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nsCSSFilterInstance::ToAttributeColor(nscolor aColor)
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{
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return Color(
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NS_GET_R(aColor) / 255.0,
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NS_GET_G(aColor) / 255.0,
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NS_GET_B(aColor) / 255.0,
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NS_GET_A(aColor) / 255.0
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);
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}
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int32_t
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nsCSSFilterInstance::GetLastResultIndex(const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs)
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{
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uint32_t numPrimitiveDescrs = aPrimitiveDescrs.Length();
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return !numPrimitiveDescrs ?
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FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic :
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numPrimitiveDescrs - 1;
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}
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void
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nsCSSFilterInstance::SetBounds(FilterPrimitiveDescription& aDescr,
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs)
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{
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int32_t inputIndex = GetLastResultIndex(aPrimitiveDescrs);
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nsIntRect inputBounds = (inputIndex < 0) ?
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mTargetBoundsInFilterSpace : aPrimitiveDescrs[inputIndex].PrimitiveSubregion();
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nsTArray<nsIntRegion> inputExtents;
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inputExtents.AppendElement(inputBounds);
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nsIntRegion outputExtents =
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FilterSupport::PostFilterExtentsForPrimitive(aDescr, inputExtents);
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IntRect outputBounds = outputExtents.GetBounds();
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aDescr.SetPrimitiveSubregion(outputBounds);
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aDescr.SetFilterSpaceBounds(outputBounds);
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}
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