gecko-dev/layout/svg/nsCSSFilterInstance.cpp

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