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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005-2019 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2012, 2013 Google Inc. All rights reserved.
* Copyright (C) 2014 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "StyleBuilderState.h"
#include "CSSCursorImageValue.h"
#include "CSSFilterImageValue.h"
#include "CSSFontSelector.h"
#include "CSSFunctionValue.h"
#include "CSSGradientValue.h"
#include "CSSImageSetValue.h"
#include "CSSImageValue.h"
#include "CSSShadowValue.h"
#include "RenderTheme.h"
#include "SVGElement.h"
#include "SVGSVGElement.h"
#include "Settings.h"
#include "StyleBuilder.h"
#include "StyleCachedImage.h"
#include "StyleFontSizeFunctions.h"
#include "StyleGeneratedImage.h"
#include "TransformFunctions.h"
namespace WebCore {
namespace Style {
BuilderState::BuilderState(Builder& builder, RenderStyle& style, BuilderContext&& context)
: m_builder(builder)
, m_styleMap(*this)
, m_style(style)
, m_context(WTFMove(context))
, m_cssToLengthConversionData(&style, rootElementStyle(), document().renderView())
{
}
// SVG handles zooming in a different way compared to CSS. The whole document is scaled instead
// of each individual length value in the render style / tree. CSSPrimitiveValue::computeLength*()
// multiplies each resolved length with the zoom multiplier - so for SVG we need to disable that.
// Though all CSS values that can be applied to outermost <svg> elements (width/height/border/padding...)
// need to respect the scaling. RenderBox (the parent class of RenderSVGRoot) grabs values like
// width/height/border/padding/... from the RenderStyle -> for SVG these values would never scale,
// if we'd pass a 1.0 zoom factor everyhwere. So we only pass a zoom factor of 1.0 for specific
// properties that are NOT allowed to scale within a zoomed SVG document (letter/word-spacing/font-size).
bool BuilderState::useSVGZoomRules() const
{
return is<SVGElement>(element());
}
bool BuilderState::useSVGZoomRulesForLength() const
{
return is<SVGElement>(element()) && !(is<SVGSVGElement>(*element()) && element()->parentNode());
}
RefPtr<StyleImage> BuilderState::createStyleImage(CSSValue& value)
{
if (is<CSSImageGeneratorValue>(value)) {
if (is<CSSGradientValue>(value))
return StyleGeneratedImage::create(downcast<CSSGradientValue>(value).gradientWithStylesResolved(*this));
if (is<CSSFilterImageValue>(value)) {
// FilterImage needs to calculate FilterOperations.
downcast<CSSFilterImageValue>(value).createFilterOperations(*this);
}
return StyleGeneratedImage::create(downcast<CSSImageGeneratorValue>(value));
}
if (is<CSSImageValue>(value) || is<CSSImageSetValue>(value) || is<CSSCursorImageValue>(value))
return StyleCachedImage::create(value);
return nullptr;
}
static FilterOperation::OperationType filterOperationForType(CSSValueID type)
{
switch (type) {
case CSSValueUrl:
return FilterOperation::REFERENCE;
case CSSValueGrayscale:
return FilterOperation::GRAYSCALE;
case CSSValueSepia:
return FilterOperation::SEPIA;
case CSSValueSaturate:
return FilterOperation::SATURATE;
case CSSValueHueRotate:
return FilterOperation::HUE_ROTATE;
case CSSValueInvert:
return FilterOperation::INVERT;
case CSSValueAppleInvertLightness:
return FilterOperation::APPLE_INVERT_LIGHTNESS;
case CSSValueOpacity:
return FilterOperation::OPACITY;
case CSSValueBrightness:
return FilterOperation::BRIGHTNESS;
case CSSValueContrast:
return FilterOperation::CONTRAST;
case CSSValueBlur:
return FilterOperation::BLUR;
case CSSValueDropShadow:
return FilterOperation::DROP_SHADOW;
default:
break;
}
ASSERT_NOT_REACHED();
return FilterOperation::NONE;
}
bool BuilderState::createFilterOperations(const CSSValue& inValue, FilterOperations& outOperations)
{
// FIXME: Move this code somewhere else.
ASSERT(outOperations.isEmpty());
if (is<CSSPrimitiveValue>(inValue)) {
auto& primitiveValue = downcast<CSSPrimitiveValue>(inValue);
if (primitiveValue.valueID() == CSSValueNone)
return true;
}
if (!is<CSSValueList>(inValue))
return false;
FilterOperations operations;
for (auto& currentValue : downcast<CSSValueList>(inValue)) {
if (is<CSSPrimitiveValue>(currentValue)) {
auto& primitiveValue = downcast<CSSPrimitiveValue>(currentValue.get());
if (!primitiveValue.isURI())
continue;
String cssUrl = primitiveValue.stringValue();
URL url = document().completeURL(cssUrl);
auto operation = ReferenceFilterOperation::create(cssUrl, url.fragmentIdentifier());
operations.operations().append(WTFMove(operation));
continue;
}
if (!is<CSSFunctionValue>(currentValue))
continue;
auto& filterValue = downcast<CSSFunctionValue>(currentValue.get());
FilterOperation::OperationType operationType = filterOperationForType(filterValue.name());
// Check that all parameters are primitive values, with the
// exception of drop shadow which has a CSSShadowValue parameter.
const CSSPrimitiveValue* firstValue = nullptr;
if (operationType != FilterOperation::DROP_SHADOW) {
bool haveNonPrimitiveValue = false;
for (unsigned j = 0; j < filterValue.length(); ++j) {
if (!is<CSSPrimitiveValue>(*filterValue.itemWithoutBoundsCheck(j))) {
haveNonPrimitiveValue = true;
break;
}
}
if (haveNonPrimitiveValue)
continue;
if (filterValue.length())
firstValue = downcast<CSSPrimitiveValue>(filterValue.itemWithoutBoundsCheck(0));
}
switch (operationType) {
case FilterOperation::GRAYSCALE:
case FilterOperation::SEPIA:
case FilterOperation::SATURATE: {
double amount = 1;
if (filterValue.length() == 1) {
amount = firstValue->doubleValue();
if (firstValue->isPercentage())
amount /= 100;
}
operations.operations().append(BasicColorMatrixFilterOperation::create(amount, operationType));
break;
}
case FilterOperation::HUE_ROTATE: {
double angle = 0;
if (filterValue.length() == 1)
angle = firstValue->computeDegrees();
operations.operations().append(BasicColorMatrixFilterOperation::create(angle, operationType));
break;
}
case FilterOperation::INVERT:
case FilterOperation::BRIGHTNESS:
case FilterOperation::CONTRAST:
case FilterOperation::OPACITY: {
double amount = 1;
if (filterValue.length() == 1) {
amount = firstValue->doubleValue();
if (firstValue->isPercentage())
amount /= 100;
}
operations.operations().append(BasicComponentTransferFilterOperation::create(amount, operationType));
break;
}
case FilterOperation::APPLE_INVERT_LIGHTNESS: {
operations.operations().append(InvertLightnessFilterOperation::create());
break;
}
case FilterOperation::BLUR: {
Length stdDeviation = Length(0, Fixed);
if (filterValue.length() >= 1)
stdDeviation = convertToFloatLength(firstValue, cssToLengthConversionData());
if (stdDeviation.isUndefined())
return false;
operations.operations().append(BlurFilterOperation::create(stdDeviation));
break;
}
case FilterOperation::DROP_SHADOW: {
if (filterValue.length() != 1)
return false;
const auto* cssValue = filterValue.itemWithoutBoundsCheck(0);
if (!is<CSSShadowValue>(cssValue))
continue;
const auto& item = downcast<CSSShadowValue>(*cssValue);
int x = item.x->computeLength<int>(cssToLengthConversionData());
int y = item.y->computeLength<int>(cssToLengthConversionData());
IntPoint location(x, y);
int blur = item.blur ? item.blur->computeLength<int>(cssToLengthConversionData()) : 0;
Color color;
if (item.color)
color = colorFromPrimitiveValue(*item.color);
operations.operations().append(DropShadowFilterOperation::create(location, blur, color.isValid() ? color : Color::transparent));
break;
}
default:
ASSERT_NOT_REACHED();
break;
}
}
outOperations = operations;
return true;
}
bool BuilderState::isColorFromPrimitiveValueDerivedFromElement(const CSSPrimitiveValue& value)
{
switch (value.valueID()) {
case CSSValueWebkitText:
case CSSValueWebkitLink:
case CSSValueWebkitActivelink:
case CSSValueCurrentcolor:
return true;
default:
return false;
}
}
Color BuilderState::colorFromPrimitiveValue(const CSSPrimitiveValue& value, bool forVisitedLink) const
{
if (value.isRGBColor())
return value.color();
auto identifier = value.valueID();
switch (identifier) {
case CSSValueWebkitText:
return document().textColor();
case CSSValueWebkitLink:
return (element() && element()->isLink() && forVisitedLink) ? document().visitedLinkColor() : document().linkColor();
case CSSValueWebkitActivelink:
return document().activeLinkColor();
case CSSValueWebkitFocusRingColor:
return RenderTheme::singleton().focusRingColor(document().styleColorOptions(&m_style));
case CSSValueCurrentcolor:
// Color is an inherited property so depending on it effectively makes the property inherited.
// FIXME: Setting the flag as a side effect of calling this function is a bit oblique. Can we do better?
m_style.setHasExplicitlyInheritedProperties();
return m_style.color();
default:
return StyleColor::colorFromKeyword(identifier, document().styleColorOptions(&m_style));
}
}
void BuilderState::registerContentAttribute(const AtomString& attributeLocalName)
{
if (style().styleType() == PseudoId::Before || style().styleType() == PseudoId::After)
m_registeredContentAttributes.append(attributeLocalName);
}
void BuilderState::adjustStyleForInterCharacterRuby()
{
if (m_style.rubyPosition() != RubyPosition::InterCharacter || !element() || !element()->hasTagName(HTMLNames::rtTag))
return;
m_style.setTextAlign(TextAlignMode::Center);
if (m_style.isHorizontalWritingMode())
m_style.setWritingMode(LeftToRightWritingMode);
}
void BuilderState::updateFont()
{
if (!m_fontDirty && m_style.fontCascade().fonts())
return;
#if ENABLE(TEXT_AUTOSIZING)
updateFontForTextSizeAdjust();
#endif
updateFontForGenericFamilyChange();
updateFontForZoomChange();
updateFontForOrientationChange();
m_style.fontCascade().update(&const_cast<Document&>(document()).fontSelector());
m_fontDirty = false;
}
#if ENABLE(TEXT_AUTOSIZING)
void BuilderState::updateFontForTextSizeAdjust()
{
if (m_style.textSizeAdjust().isAuto()
|| !document().settings().textAutosizingEnabled()
|| (document().settings().textAutosizingUsesIdempotentMode() && !m_style.textSizeAdjust().isNone()))
return;
auto newFontDescription = m_style.fontDescription();
if (!m_style.textSizeAdjust().isNone())
newFontDescription.setComputedSize(newFontDescription.specifiedSize() * m_style.textSizeAdjust().multiplier());
else
newFontDescription.setComputedSize(newFontDescription.specifiedSize());
m_style.setFontDescription(WTFMove(newFontDescription));
}
#endif
void BuilderState::updateFontForZoomChange()
{
if (m_style.effectiveZoom() == parentStyle().effectiveZoom() && m_style.textZoom() == parentStyle().textZoom())
return;
const auto& childFont = m_style.fontDescription();
auto newFontDescription = childFont;
setFontSize(newFontDescription, childFont.specifiedSize());
m_style.setFontDescription(WTFMove(newFontDescription));
}
void BuilderState::updateFontForGenericFamilyChange()
{
const auto& childFont = m_style.fontDescription();
if (childFont.isAbsoluteSize())
return;
const auto& parentFont = parentStyle().fontDescription();
if (childFont.useFixedDefaultSize() == parentFont.useFixedDefaultSize())
return;
// We know the parent is monospace or the child is monospace, and that font
// size was unspecified. We want to scale our font size as appropriate.
// If the font uses a keyword size, then we refetch from the table rather than
// multiplying by our scale factor.
float size = [&] {
if (CSSValueID sizeIdentifier = childFont.keywordSizeAsIdentifier())
return Style::fontSizeForKeyword(sizeIdentifier, childFont.useFixedDefaultSize(), document());
auto fixedSize = document().settings().defaultFixedFontSize();
auto defaultSize = document().settings().defaultFontSize();
float fixedScaleFactor = (fixedSize && defaultSize) ? static_cast<float>(fixedSize) / defaultSize : 1;
return parentFont.useFixedDefaultSize() ? childFont.specifiedSize() / fixedScaleFactor : childFont.specifiedSize() * fixedScaleFactor;
}();
auto newFontDescription = childFont;
setFontSize(newFontDescription, size);
m_style.setFontDescription(WTFMove(newFontDescription));
}
void BuilderState::updateFontForOrientationChange()
{
auto [fontOrientation, glyphOrientation] = m_style.fontAndGlyphOrientation();
const auto& fontDescription = m_style.fontDescription();
if (fontDescription.orientation() == fontOrientation && fontDescription.nonCJKGlyphOrientation() == glyphOrientation)
return;
auto newFontDescription = fontDescription;
newFontDescription.setNonCJKGlyphOrientation(glyphOrientation);
newFontDescription.setOrientation(fontOrientation);
m_style.setFontDescription(WTFMove(newFontDescription));
}
void BuilderState::setFontSize(FontCascadeDescription& fontDescription, float size)
{
fontDescription.setSpecifiedSize(size);
fontDescription.setComputedSize(Style::computedFontSizeFromSpecifiedSize(size, fontDescription.isAbsoluteSize(), useSVGZoomRules(), &style(), document()));
}
}
}