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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
// Main header first:
#include "CSSFilterInstance.h"
// Keep others in (case-insensitive) order:
#include "FilterDescription.h"
#include "gfx2DGlue.h"
#include "gfxUtils.h"
#include "nsIFrame.h"
#include "nsStyleStruct.h"
#include "nsTArray.h"
using namespace mozilla::gfx;
namespace mozilla {
static float ClampFactor(float aFactor) {
if (aFactor > 1) {
return 1;
}
if (aFactor < 0) {
MOZ_ASSERT_UNREACHABLE("A negative value should not have been parsed.");
return 0;
}
return aFactor;
}
CSSFilterInstance::CSSFilterInstance(
const StyleFilter& aFilter, nscolor aShadowFallbackColor,
const nsIntRect& aTargetBoundsInFilterSpace,
const gfxMatrix& aFrameSpaceInCSSPxToFilterSpaceTransform)
: mFilter(aFilter),
mShadowFallbackColor(aShadowFallbackColor),
mTargetBoundsInFilterSpace(aTargetBoundsInFilterSpace),
mFrameSpaceInCSSPxToFilterSpaceTransform(
aFrameSpaceInCSSPxToFilterSpaceTransform) {}
nsresult CSSFilterInstance::BuildPrimitives(
nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
bool aInputIsTainted) {
FilterPrimitiveDescription descr =
CreatePrimitiveDescription(aPrimitiveDescrs, aInputIsTainted);
nsresult result;
switch (mFilter.tag) {
case StyleFilter::Tag::Blur:
result = SetAttributesForBlur(descr);
break;
case StyleFilter::Tag::Brightness:
result = SetAttributesForBrightness(descr);
break;
case StyleFilter::Tag::Contrast:
result = SetAttributesForContrast(descr);
break;
case StyleFilter::Tag::DropShadow:
result = SetAttributesForDropShadow(descr);
break;
case StyleFilter::Tag::Grayscale:
result = SetAttributesForGrayscale(descr);
break;
case StyleFilter::Tag::HueRotate:
result = SetAttributesForHueRotate(descr);
break;
case StyleFilter::Tag::Invert:
result = SetAttributesForInvert(descr);
break;
case StyleFilter::Tag::Opacity:
result = SetAttributesForOpacity(descr);
break;
case StyleFilter::Tag::Saturate:
result = SetAttributesForSaturate(descr);
break;
case StyleFilter::Tag::Sepia:
result = SetAttributesForSepia(descr);
break;
default:
MOZ_ASSERT_UNREACHABLE("not a valid CSS filter type");
return NS_ERROR_FAILURE;
}
if (NS_FAILED(result)) {
return result;
}
// Compute the primitive's bounds now that we've determined its attributes.
// Some attributes like blur radius can influence the bounds.
SetBounds(descr, aPrimitiveDescrs);
// Add this primitive to the filter chain.
aPrimitiveDescrs.AppendElement(std::move(descr));
return NS_OK;
}
FilterPrimitiveDescription CSSFilterInstance::CreatePrimitiveDescription(
const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
bool aInputIsTainted) {
FilterPrimitiveDescription descr;
int32_t inputIndex = GetLastResultIndex(aPrimitiveDescrs);
descr.SetInputPrimitive(0, inputIndex);
descr.SetIsTainted(inputIndex < 0 ? aInputIsTainted
: aPrimitiveDescrs[inputIndex].IsTainted());
descr.SetInputColorSpace(0, ColorSpace::SRGB);
descr.SetOutputColorSpace(ColorSpace::SRGB);
return descr;
}
nsresult CSSFilterInstance::SetAttributesForBlur(
FilterPrimitiveDescription& aDescr) {
const Length& radiusInFrameSpace = mFilter.AsBlur();
Size radiusInFilterSpace =
BlurRadiusToFilterSpace(radiusInFrameSpace.ToAppUnits());
GaussianBlurAttributes atts;
atts.mStdDeviation = radiusInFilterSpace;
aDescr.Attributes() = AsVariant(atts);
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForBrightness(
FilterPrimitiveDescription& aDescr) {
float value = mFilter.AsBrightness();
float intercept = 0.0f;
ComponentTransferAttributes atts;
// Set transfer functions for RGB.
atts.mTypes[kChannelROrRGB] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_LINEAR;
atts.mTypes[kChannelG] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
atts.mTypes[kChannelB] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
std::array<float, 2> slopeIntercept;
slopeIntercept[kComponentTransferSlopeIndex] = value;
slopeIntercept[kComponentTransferInterceptIndex] = intercept;
atts.mValues[kChannelROrRGB].AppendElements(Span(slopeIntercept));
atts.mTypes[kChannelA] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY;
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForContrast(
FilterPrimitiveDescription& aDescr) {
float value = mFilter.AsContrast();
float intercept = -(0.5 * value) + 0.5;
ComponentTransferAttributes atts;
// Set transfer functions for RGB.
atts.mTypes[kChannelROrRGB] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_LINEAR;
atts.mTypes[kChannelG] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
atts.mTypes[kChannelB] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
std::array<float, 2> slopeIntercept;
slopeIntercept[kComponentTransferSlopeIndex] = value;
slopeIntercept[kComponentTransferInterceptIndex] = intercept;
atts.mValues[kChannelROrRGB].AppendElements(Span(slopeIntercept));
atts.mTypes[kChannelA] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY;
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForDropShadow(
FilterPrimitiveDescription& aDescr) {
const auto& shadow = mFilter.AsDropShadow();
DropShadowAttributes atts;
// Set drop shadow blur radius.
Size radiusInFilterSpace = BlurRadiusToFilterSpace(shadow.blur.ToAppUnits());
atts.mStdDeviation = radiusInFilterSpace;
// Set offset.
IntPoint offsetInFilterSpace = OffsetToFilterSpace(
shadow.horizontal.ToAppUnits(), shadow.vertical.ToAppUnits());
atts.mOffset = offsetInFilterSpace;
// Set color. If unspecified, use the CSS color property.
nscolor shadowColor = shadow.color.CalcColor(mShadowFallbackColor);
atts.mColor = ToAttributeColor(shadowColor);
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForGrayscale(
FilterPrimitiveDescription& aDescr) {
ColorMatrixAttributes atts;
// Set color matrix type.
atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_SATURATE;
// Set color matrix value.
atts.mValues.AppendElement(1 - ClampFactor(mFilter.AsGrayscale()));
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForHueRotate(
FilterPrimitiveDescription& aDescr) {
ColorMatrixAttributes atts;
// Set color matrix type.
atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_HUE_ROTATE;
// Set color matrix value.
atts.mValues.AppendElement(mFilter.AsHueRotate().ToDegrees());
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForInvert(
FilterPrimitiveDescription& aDescr) {
ComponentTransferAttributes atts;
float value = ClampFactor(mFilter.AsInvert());
// Set transfer functions for RGB.
std::array<float, 2> invertTableValues = {value, 1 - value};
// Set transfer functions for RGB.
atts.mTypes[kChannelROrRGB] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_TABLE;
atts.mTypes[kChannelG] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
atts.mTypes[kChannelB] = (uint8_t)SVG_FECOMPONENTTRANSFER_SAME_AS_R;
atts.mValues[kChannelROrRGB].AppendElements(Span(invertTableValues));
atts.mTypes[kChannelA] = (uint8_t)SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY;
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForOpacity(
FilterPrimitiveDescription& aDescr) {
OpacityAttributes atts;
float value = ClampFactor(mFilter.AsOpacity());
atts.mOpacity = value;
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForSaturate(
FilterPrimitiveDescription& aDescr) {
ColorMatrixAttributes atts;
// Set color matrix type.
atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_SATURATE;
// Set color matrix value.
atts.mValues.AppendElement(mFilter.AsSaturate());
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
nsresult CSSFilterInstance::SetAttributesForSepia(
FilterPrimitiveDescription& aDescr) {
ColorMatrixAttributes atts;
// Set color matrix type.
atts.mType = (uint32_t)SVG_FECOLORMATRIX_TYPE_SEPIA;
// Set color matrix value.
atts.mValues.AppendElement(ClampFactor(mFilter.AsSepia()));
aDescr.Attributes() = AsVariant(std::move(atts));
return NS_OK;
}
Size CSSFilterInstance::BlurRadiusToFilterSpace(nscoord aRadiusInFrameSpace) {
float radiusInFrameSpaceInCSSPx =
nsPresContext::AppUnitsToFloatCSSPixels(aRadiusInFrameSpace);
// Convert the radius to filter space.
Size radiusInFilterSpace(radiusInFrameSpaceInCSSPx,
radiusInFrameSpaceInCSSPx);
// Narrow the scale factors. They will only be used with types containing
// floating point types.
auto frameSpaceInCSSPxToFilterSpaceScale =
mFrameSpaceInCSSPxToFilterSpaceTransform.ScaleFactors()
.ConvertTo<float>();
radiusInFilterSpace =
radiusInFilterSpace * frameSpaceInCSSPxToFilterSpaceScale;
// Check the radius limits.
if (radiusInFilterSpace.width < 0 || radiusInFilterSpace.height < 0) {
MOZ_ASSERT_UNREACHABLE(
"we shouldn't have parsed a negative radius in the "
"style");
return Size();
}
Float maxStdDeviation = (Float)kMaxStdDeviation;
radiusInFilterSpace.width =
std::min(radiusInFilterSpace.width, maxStdDeviation);
radiusInFilterSpace.height =
std::min(radiusInFilterSpace.height, maxStdDeviation);
return radiusInFilterSpace;
}
IntPoint CSSFilterInstance::OffsetToFilterSpace(nscoord aXOffsetInFrameSpace,
nscoord aYOffsetInFrameSpace) {
gfxPoint offsetInFilterSpace(
nsPresContext::AppUnitsToFloatCSSPixels(aXOffsetInFrameSpace),
nsPresContext::AppUnitsToFloatCSSPixels(aYOffsetInFrameSpace));
// Convert the radius to filter space.
auto frameSpaceInCSSPxToFilterSpaceScale =
mFrameSpaceInCSSPxToFilterSpaceTransform.ScaleFactors();
offsetInFilterSpace.x *= frameSpaceInCSSPxToFilterSpaceScale.xScale;
offsetInFilterSpace.y *= frameSpaceInCSSPxToFilterSpaceScale.yScale;
return IntPoint(int32_t(offsetInFilterSpace.x),
int32_t(offsetInFilterSpace.y));
}
sRGBColor CSSFilterInstance::ToAttributeColor(nscolor aColor) {
return sRGBColor(NS_GET_R(aColor) / 255.0, NS_GET_G(aColor) / 255.0,
NS_GET_B(aColor) / 255.0, NS_GET_A(aColor) / 255.0);
}
int32_t CSSFilterInstance::GetLastResultIndex(
const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs) {
uint32_t numPrimitiveDescrs = aPrimitiveDescrs.Length();
return !numPrimitiveDescrs
? FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic
: numPrimitiveDescrs - 1;
}
void CSSFilterInstance::SetBounds(
FilterPrimitiveDescription& aDescr,
const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs) {
int32_t inputIndex = GetLastResultIndex(aPrimitiveDescrs);
nsIntRect inputBounds =
(inputIndex < 0) ? mTargetBoundsInFilterSpace
: aPrimitiveDescrs[inputIndex].PrimitiveSubregion();
AutoTArray<nsIntRegion, 8> inputExtents;
inputExtents.AppendElement(inputBounds);
nsIntRegion outputExtents =
FilterSupport::PostFilterExtentsForPrimitive(aDescr, inputExtents);
IntRect outputBounds = outputExtents.GetBounds();
aDescr.SetPrimitiveSubregion(outputBounds);
aDescr.SetFilterSpaceBounds(outputBounds);
}
} // namespace mozilla