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/*
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* 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 APPLE INC. ``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 APPLE INC. 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 "StyleLineHeight.h"
#include "AnimationUtilities.h"
#include "StyleBuilderChecking.h"
#include "StyleBuilderConverter.h"
#include "StyleLengthWrapper+Blending.h"
#include "StyleLengthWrapper+CSSValueConversion.h"
#include "StylePrimitiveNumericTypes+CSSValueConversion.h"
namespace WebCore {
namespace Style {
auto CSSValueConversion<LineHeight>::operator()(BuilderState& state, const CSSValue& value, float multiplier) -> LineHeight
{
RefPtr primitiveValue = requiredDowncast<CSSPrimitiveValue>(state, value);
if (!primitiveValue)
return CSS::Keyword::Normal { };
return operator()(state, *primitiveValue, multiplier);
}
auto CSSValueConversion<LineHeight>::operator()(BuilderState& state, const CSSPrimitiveValue& primitiveValue, float multiplier) -> LineHeight
{
auto valueID = primitiveValue.valueID();
if (valueID == CSSValueNormal || CSSPropertyParserHelpers::isSystemFontShorthand(valueID))
return CSS::Keyword::Normal { };
auto conversionData = state
.cssToLengthConversionData()
.copyForLineHeight(zoomWithTextZoomFactor(state));
// If EvaluationTimeZoom is not enabled then we will scale the lengths in the
// calc values when we create the CalculationValue below by using the zoom from conversionData.
// To avoid double zooming when we evaluate the calc expression we need to make sure
// we have a ZoomFactor of 1.0. Otherwise, we defer to whatever is on the conversionData
// since EvaluationTimeZoom will set the appropriate value.
auto zoomFactor = [&] {
if (!state.style().evaluationTimeZoomEnabled())
return Style::ZoomFactor { 1.0f, state.style().deviceScaleFactor() };
return Style::ZoomFactor { conversionData.zoom(), state.style().deviceScaleFactor() };
};
if (primitiveValue.isLength() || primitiveValue.isCalculatedPercentageWithLength()) {
double fixedValue = 0;
if (primitiveValue.isLength())
fixedValue = primitiveValue.resolveAsLength(conversionData);
else
fixedValue = primitiveValue.protectedCssCalcValue()->createCalculationValue(conversionData, CSSCalcSymbolTable { })->evaluate(state.style().fontDescription().computedSizeForRangeZoomOption(conversionData.rangeZoomOption()), zoomFactor());
if (multiplier != 1.0f)
fixedValue *= multiplier;
return LineHeight::Fixed {
CSS::clampToRange<LineHeight::Fixed::range, float>(fixedValue, minValueForCssLength, maxValueForCssLength)
};
}
// Line-height percentages need to inherit as if they were Fixed pixel values. In the example:
// <div style="font-size: 10px; line-height: 150%;"><div style="font-size: 100px;"></div></div>
// the inner element should have line-height of 15px. However, in this example:
// <div style="font-size: 10px; line-height: 1.5;"><div style="font-size: 100px;"></div></div>
// the inner element should have a line-height of 150px. Therefore, we map percentages to Fixed
// values and raw numbers to percentages.
if (primitiveValue.isPercentage()) {
// FIXME: percentage should not be restricted to an integer here.
auto textZoom = evaluationTimeZoomEnabled(state) ? conversionData.zoom() : 1.0f;
return LineHeight::Fixed {
CSS::clampToRange<LineHeight::Fixed::range, float>((state.style().fontDescription().computedSizeForRangeZoomOption(conversionData.rangeZoomOption()) * primitiveValue.resolveAsPercentage<int>(conversionData) * textZoom) / 100.0, minValueForCssLength, maxValueForCssLength)
};
}
if (primitiveValue.isNumber()) {
return LineHeight::Percentage {
CSS::clampToRange<LineHeight::Percentage::range, float>(primitiveValue.resolveAsNumber(conversionData) * 100.0)
};
}
state.setCurrentPropertyInvalidAtComputedValueTime();
return CSS::Keyword::Normal { };
}
// MARK: - Blending
auto Blending<LineHeight>::canBlend(const LineHeight& a, const LineHeight& b) -> bool
{
return a.hasSameType(b) || (a.isCalculated() && b.isSpecified()) || (b.isCalculated() && a.isSpecified());
}
auto Blending<LineHeight>::requiresInterpolationForAccumulativeIteration(const LineHeight& a, const LineHeight& b) -> bool
{
return !a.hasSameType(b) || a.isCalculated() || b.isCalculated();
}
auto Blending<LineHeight>::blend(const LineHeight& a, const LineHeight& b, const BlendingContext& context) -> LineHeight
{
if (!a.isSpecified() || !b.isSpecified())
return context.progress < 0.5 ? a : b;
if (a.isCalculated() || b.isCalculated() || !a.hasSameType(b))
return LengthWrapperBlendingSupport<LineHeight>::blendMixedSpecifiedTypes(a, b, context);
if (!context.progress && context.isReplace())
return a;
if (context.progress == 1 && context.isReplace())
return b;
auto resultType = b.m_value.type();
ASSERT(resultType == LineHeight::indexForPercentage || resultType == LineHeight::indexForFixed);
if (resultType == LineHeight::indexForPercentage) {
return Style::blend(
LineHeight::Percentage { a.m_value.value() },
LineHeight::Percentage { b.m_value.value() },
context
);
} else {
return Style::blend(
LineHeight::Fixed { a.m_value.value() },
LineHeight::Fixed { b.m_value.value() },
context
);
}
}
} // namespace Style
} // namespace WebCore
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