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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
* Copyright (C) 2014-2017 Apple Inc. All rights reserved.
* Copyright (C) 2020 Metrological Group B.V.
* Copyright (C) 2020 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "StyleResolveForFontRaw.h"
#include "CSSFontSelector.h"
#include "CSSHelper.h"
#include "CSSPropertyParserHelpers.h"
#include "Document.h"
#include "FontCascade.h"
#include "FontCascadeDescription.h"
#include "RenderStyle.h"
#include "ScriptExecutionContext.h"
#include "Settings.h"
#include "StyleFontSizeFunctions.h"
#include "WebKitFontFamilyNames.h"
namespace WebCore {
namespace Style {
using namespace CSSPropertyParserHelpers;
using namespace WebKitFontFamilyNames;
static bool useFixedDefaultSize(const FontCascadeDescription& fontDescription)
{
return fontDescription.familyCount() == 1 && fontDescription.firstFamily() == familyNamesData->at(FamilyNamesIndex::MonospaceFamily);
}
std::optional<FontCascade> resolveForFontRaw(const FontRaw& fontRaw, FontCascadeDescription&& fontDescription, ScriptExecutionContext& context)
{
ASSERT(context.cssFontSelector());
// Map the font property longhands into the style.
float parentSize = fontDescription.specifiedSize();
// Font family applied in the same way as StyleBuilderCustom::applyValueFontFamily
// Before mapping in a new font-family property, we should reset the generic family.
bool oldFamilyUsedFixedDefaultSize = useFixedDefaultSize(fontDescription);
Vector<AtomString> families;
families.reserveInitialCapacity(fontRaw.family.size());
for (auto& item : fontRaw.family) {
AtomString family;
bool isGenericFamily = false;
switchOn(item, [&] (CSSValueID ident) {
isGenericFamily = ident != CSSValueWebkitBody;
if (isGenericFamily)
family = familyNamesData->at(CSSPropertyParserHelpers::genericFontFamilyIndex(ident));
else
family = AtomString(context.settingsValues().fontGenericFamilies.standardFontFamily());
}, [&] (const AtomString& familyString) {
family = familyString;
});
if (family.isEmpty())
continue;
if (families.isEmpty())
fontDescription.setIsSpecifiedFont(!isGenericFamily);
families.uncheckedAppend(family);
}
if (families.isEmpty())
return std::nullopt;
fontDescription.setFamilies(families);
if (useFixedDefaultSize(fontDescription) != oldFamilyUsedFixedDefaultSize) {
if (CSSValueID sizeIdentifier = fontDescription.keywordSizeAsIdentifier()) {
auto size = Style::fontSizeForKeyword(sizeIdentifier, !oldFamilyUsedFixedDefaultSize, context.settingsValues());
fontDescription.setSpecifiedSize(size);
fontDescription.setComputedSize(Style::computedFontSizeFromSpecifiedSize(size, fontDescription.isAbsoluteSize(), 1.0, MinimumFontSizeRule::None, context.settingsValues()));
}
}
// Font style applied in the same way as BuilderConverter::convertFontStyleFromValue
if (fontRaw.style) {
switch (fontRaw.style->style) {
case CSSValueNormal:
break;
case CSSValueItalic:
fontDescription.setItalic(italicValue());
break;
case CSSValueOblique: {
float degrees;
if (fontRaw.style->angle)
degrees = static_cast<float>(CSSPrimitiveValue::computeDegrees(fontRaw.style->angle->type, fontRaw.style->angle->value));
else
degrees = 0;
fontDescription.setItalic(FontSelectionValue(degrees));
break;
}
default:
ASSERT_NOT_REACHED();
break;
}
}
fontDescription.setFontStyleAxis((fontRaw.style && fontRaw.style->style == CSSValueItalic) ? FontStyleAxis::ital : FontStyleAxis::slnt);
if (fontRaw.variantCaps) {
switch (*fontRaw.variantCaps) {
case CSSValueNormal:
fontDescription.setVariantCaps(FontVariantCaps::Normal);
break;
case CSSValueSmallCaps:
fontDescription.setVariantCaps(FontVariantCaps::Small);
break;
case CSSValueAllSmallCaps:
fontDescription.setVariantCaps(FontVariantCaps::AllSmall);
break;
case CSSValuePetiteCaps:
fontDescription.setVariantCaps(FontVariantCaps::Petite);
break;
case CSSValueAllPetiteCaps:
fontDescription.setVariantCaps(FontVariantCaps::AllPetite);
break;
case CSSValueUnicase:
fontDescription.setVariantCaps(FontVariantCaps::Unicase);
break;
case CSSValueTitlingCaps:
fontDescription.setVariantCaps(FontVariantCaps::Titling);
break;
default:
ASSERT_NOT_REACHED();
break;
}
}
if (fontRaw.weight) {
auto weight = WTF::switchOn(*fontRaw.weight, [&] (CSSValueID ident) {
switch (ident) {
case CSSValueNormal:
return normalWeightValue();
case CSSValueBold:
return boldWeightValue();
case CSSValueBolder:
return FontCascadeDescription::bolderWeight(fontDescription.weight());
case CSSValueLighter:
return FontCascadeDescription::lighterWeight(fontDescription.weight());
default:
ASSERT_NOT_REACHED();
return normalWeightValue();
}
}, [&] (double weight) {
return FontSelectionValue::clampFloat(weight);
});
fontDescription.setWeight(weight);
}
fontDescription.setKeywordSizeFromIdentifier(CSSValueInvalid);
float size = WTF::switchOn(fontRaw.size, [&] (CSSValueID ident) {
switch (ident) {
case CSSValueXxSmall:
case CSSValueXSmall:
case CSSValueSmall:
case CSSValueMedium:
case CSSValueLarge:
case CSSValueXLarge:
case CSSValueXxLarge:
case CSSValueXxxLarge:
fontDescription.setKeywordSizeFromIdentifier(ident);
return Style::fontSizeForKeyword(ident, fontDescription.useFixedDefaultSize(), context.settingsValues());
case CSSValueLarger:
return parentSize * 1.2f;
case CSSValueSmaller:
return parentSize / 1.2f;
default:
return 0.f;
}
}, [&] (const CSSPropertyParserHelpers::LengthOrPercentRaw& lengthOrPercent) {
return WTF::switchOn(lengthOrPercent, [&] (const CSSPropertyParserHelpers::LengthRaw& length) {
auto fontCascade = FontCascade(FontCascadeDescription(fontDescription));
fontCascade.update(context.cssFontSelector());
// FIXME: Passing null for the RenderView parameter means that vw and vh units will evaluate to
// zero and vmin and vmax units will evaluate as if they were px units.
// It's unclear in the specification if they're expected to work on OffscreenCanvas, given
// that it's off-screen and therefore doesn't strictly have an associated viewport.
// This needs clarification and possibly fixing.
return static_cast<float>(CSSPrimitiveValue::computeUnzoomedNonCalcLengthDouble(length.type, length.value, CSSPropertyFontSize, &fontCascade.metricsOfPrimaryFont(), &fontCascade.fontDescription(), &fontCascade.fontDescription(), is<Document>(context) ? downcast<Document>(context).renderView() : nullptr));
}, [&] (const CSSPropertyParserHelpers::PercentRaw& percentage) {
return static_cast<float>((parentSize * percentage.value) / 100.0);
});
});
if (size > 0) {
fontDescription.setSpecifiedSize(size);
fontDescription.setComputedSize(size);
}
// As there is no line-height on FontCascade, there's no need to resolve
// it, even though there is line-height information on FontRaw.
auto fontCascade = FontCascade(WTFMove(fontDescription));
fontCascade.update(context.cssFontSelector());
return fontCascade;
}
}
}
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