forked from mirrors/gecko-dev
353 lines
12 KiB
C++
353 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "CSSFilterInstance.h"
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// Keep others in (case-insensitive) order:
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#include "FilterDescription.h"
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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::gfx;
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namespace mozilla {
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static float ClampFactor(float aFactor) {
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if (aFactor > 1) {
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return 1;
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}
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if (aFactor < 0) {
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MOZ_ASSERT_UNREACHABLE("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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CSSFilterInstance::CSSFilterInstance(
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const StyleFilter& aFilter, 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(
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aFrameSpaceInCSSPxToFilterSpaceTransform) {}
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nsresult CSSFilterInstance::BuildPrimitives(
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nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
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bool aInputIsTainted) {
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FilterPrimitiveDescription descr =
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CreatePrimitiveDescription(aPrimitiveDescrs, aInputIsTainted);
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nsresult result;
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switch (mFilter.tag) {
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case StyleFilter::Tag::Blur:
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result = SetAttributesForBlur(descr);
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break;
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case StyleFilter::Tag::Brightness:
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result = SetAttributesForBrightness(descr);
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break;
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case StyleFilter::Tag::Contrast:
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result = SetAttributesForContrast(descr);
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break;
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case StyleFilter::Tag::DropShadow:
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result = SetAttributesForDropShadow(descr);
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break;
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case StyleFilter::Tag::Grayscale:
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result = SetAttributesForGrayscale(descr);
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break;
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case StyleFilter::Tag::HueRotate:
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result = SetAttributesForHueRotate(descr);
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break;
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case StyleFilter::Tag::Invert:
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result = SetAttributesForInvert(descr);
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break;
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case StyleFilter::Tag::Opacity:
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result = SetAttributesForOpacity(descr);
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break;
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case StyleFilter::Tag::Saturate:
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result = SetAttributesForSaturate(descr);
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break;
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case StyleFilter::Tag::Sepia:
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result = SetAttributesForSepia(descr);
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("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(std::move(descr));
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return NS_OK;
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}
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FilterPrimitiveDescription CSSFilterInstance::CreatePrimitiveDescription(
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
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bool aInputIsTainted) {
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FilterPrimitiveDescription descr;
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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 ? aInputIsTainted
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: 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 CSSFilterInstance::SetAttributesForBlur(
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FilterPrimitiveDescription& aDescr) {
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const Length& radiusInFrameSpace = mFilter.AsBlur();
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Size radiusInFilterSpace =
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BlurRadiusToFilterSpace(radiusInFrameSpace.ToAppUnits());
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GaussianBlurAttributes atts;
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atts.mStdDeviation = radiusInFilterSpace;
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aDescr.Attributes() = AsVariant(atts);
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForBrightness(
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FilterPrimitiveDescription& aDescr) {
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float value = mFilter.AsBrightness();
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float intercept = 0.0f;
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ComponentTransferAttributes atts;
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// Set transfer functions for RGB.
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atts.mTypes[kChannelROrRGB] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_LINEAR;
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atts.mTypes[kChannelG] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
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atts.mTypes[kChannelB] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
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float slopeIntercept[2];
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slopeIntercept[kComponentTransferSlopeIndex] = value;
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slopeIntercept[kComponentTransferInterceptIndex] = intercept;
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atts.mValues[kChannelROrRGB].AppendElements(slopeIntercept, 2);
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atts.mTypes[kChannelA] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY;
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForContrast(
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FilterPrimitiveDescription& aDescr) {
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float value = mFilter.AsContrast();
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float intercept = -(0.5 * value) + 0.5;
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ComponentTransferAttributes atts;
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// Set transfer functions for RGB.
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atts.mTypes[kChannelROrRGB] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_LINEAR;
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atts.mTypes[kChannelG] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
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atts.mTypes[kChannelB] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
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float slopeIntercept[2];
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slopeIntercept[kComponentTransferSlopeIndex] = value;
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slopeIntercept[kComponentTransferInterceptIndex] = intercept;
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atts.mValues[kChannelROrRGB].AppendElements(slopeIntercept, 2);
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atts.mTypes[kChannelA] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY;
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForDropShadow(
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FilterPrimitiveDescription& aDescr) {
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const auto& shadow = mFilter.AsDropShadow();
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DropShadowAttributes atts;
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// Set drop shadow blur radius.
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Size radiusInFilterSpace = BlurRadiusToFilterSpace(shadow.blur.ToAppUnits());
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atts.mStdDeviation = radiusInFilterSpace;
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// Set offset.
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IntPoint offsetInFilterSpace = OffsetToFilterSpace(
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shadow.horizontal.ToAppUnits(), shadow.vertical.ToAppUnits());
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atts.mOffset = offsetInFilterSpace;
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// Set color. If unspecified, use the CSS color property.
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nscolor shadowColor = shadow.color.CalcColor(mShadowFallbackColor);
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atts.mColor = ToAttributeColor(shadowColor);
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForGrayscale(
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FilterPrimitiveDescription& aDescr) {
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ColorMatrixAttributes atts;
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// Set color matrix type.
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atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_SATURATE;
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// Set color matrix values.
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float value = 1 - ClampFactor(mFilter.AsGrayscale());
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atts.mValues.AppendElements(&value, 1);
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForHueRotate(
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FilterPrimitiveDescription& aDescr) {
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ColorMatrixAttributes atts;
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// Set color matrix type.
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atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_HUE_ROTATE;
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// Set color matrix values.
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float value = mFilter.AsHueRotate().ToDegrees();
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atts.mValues.AppendElements(&value, 1);
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForInvert(
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FilterPrimitiveDescription& aDescr) {
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ComponentTransferAttributes atts;
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float value = ClampFactor(mFilter.AsInvert());
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// Set transfer functions for RGB.
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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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// Set transfer functions for RGB.
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atts.mTypes[kChannelROrRGB] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_TABLE;
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atts.mTypes[kChannelG] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
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atts.mTypes[kChannelB] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
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atts.mValues[kChannelROrRGB].AppendElements(invertTableValues, 2);
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atts.mTypes[kChannelA] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY;
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForOpacity(
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FilterPrimitiveDescription& aDescr) {
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OpacityAttributes atts;
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float value = ClampFactor(mFilter.AsOpacity());
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atts.mOpacity = value;
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForSaturate(
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FilterPrimitiveDescription& aDescr) {
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ColorMatrixAttributes atts;
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// Set color matrix type.
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atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_SATURATE;
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// Set color matrix values.
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float value = mFilter.AsSaturate();
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atts.mValues.AppendElements(&value, 1);
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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nsresult CSSFilterInstance::SetAttributesForSepia(
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FilterPrimitiveDescription& aDescr) {
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ColorMatrixAttributes atts;
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// Set color matrix type.
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atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_SEPIA;
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// Set color matrix values.
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float value = ClampFactor(mFilter.AsSepia());
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atts.mValues.AppendElements(&value, 1);
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aDescr.Attributes() = AsVariant(std::move(atts));
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return NS_OK;
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}
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Size CSSFilterInstance::BlurRadiusToFilterSpace(nscoord aRadiusInFrameSpace) {
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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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Size radiusInFilterSpace(radiusInFrameSpaceInCSSPx,
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radiusInFrameSpaceInCSSPx);
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gfxSize frameSpaceInCSSPxToFilterSpaceScale =
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mFrameSpaceInCSSPxToFilterSpaceTransform.ScaleFactors();
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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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MOZ_ASSERT_UNREACHABLE(
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"we shouldn't have parsed a negative radius in the "
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"style");
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return Size();
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}
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Float maxStdDeviation = (Float)kMaxStdDeviation;
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radiusInFilterSpace.width =
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std::min(radiusInFilterSpace.width, maxStdDeviation);
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radiusInFilterSpace.height =
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std::min(radiusInFilterSpace.height, maxStdDeviation);
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return radiusInFilterSpace;
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}
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IntPoint CSSFilterInstance::OffsetToFilterSpace(nscoord aXOffsetInFrameSpace,
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nscoord aYOffsetInFrameSpace) {
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gfxPoint offsetInFilterSpace(
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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();
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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),
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int32_t(offsetInFilterSpace.y));
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}
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sRGBColor CSSFilterInstance::ToAttributeColor(nscolor aColor) {
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return sRGBColor(NS_GET_R(aColor) / 255.0, NS_GET_G(aColor) / 255.0,
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NS_GET_B(aColor) / 255.0, NS_GET_A(aColor) / 255.0);
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}
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int32_t CSSFilterInstance::GetLastResultIndex(
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs) {
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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 CSSFilterInstance::SetBounds(
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FilterPrimitiveDescription& aDescr,
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs) {
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int32_t inputIndex = GetLastResultIndex(aPrimitiveDescrs);
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nsIntRect inputBounds =
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(inputIndex < 0) ? mTargetBoundsInFilterSpace
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: 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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} // namespace mozilla
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