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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 "StyleLineWidth.h"
#include "CSSPrimitiveValue.h"
#include "Document.h"
#include "RenderStyle+GettersInlines.h"
#include "StyleBuilderChecking.h"
#include "StyleInterpolationClient.h"
#include "StyleInterpolationContext.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include "StylePrimitiveNumericTypes+CSSValueConversion.h"
#include "StylePrimitiveNumericTypes+Evaluation.h"
#include "StylePrimitiveNumericTypes+Serialization.h"
namespace WebCore {
namespace Style {
// MARK: - Conversion
LineWidth::Length LineWidth::snapLengthAsBorderWidth(float length, float deviceScaleFactor)
{
// https://drafts.csswg.org/css-values-4/#snap-a-length-as-a-border-width
// 1. Assert: `length` is non-negative.
// NOTE: Not asserted, but checked in step 3.
// 2. If `length` is an integer number of device pixels, do nothing.
// NOTE: Handled by step 4 without explicitly checking here.
// 3. If `length` is greater than zero, but less than 1 device pixel, round `length` up to 1 device pixel.
if (auto singleDevicePixelLength = 1.0f / deviceScaleFactor; length > 0.0f && length < singleDevicePixelLength)
return LineWidth::Length { singleDevicePixelLength };
// 4. If `length` is greater than 1 device pixel, round it down to the nearest integer number of device pixels.
return LineWidth::Length { floorToDevicePixel(length, deviceScaleFactor) };
}
LineWidth::Length LineWidth::snapLengthAsBorderWidth(LineWidth::Length length, float deviceScaleFactor)
{
return snapLengthAsBorderWidth(length.unresolvedValue(), deviceScaleFactor);
}
auto CSSValueConversion<LineWidth>::operator()(BuilderState& state, const CSSValue& value) -> LineWidth
{
RefPtr primitiveValue = requiredDowncast<CSSPrimitiveValue>(state, value);
if (!primitiveValue)
return LineWidth::Length { 3.0f };
if (primitiveValue->isValueID()) {
switch (primitiveValue->valueID()) {
case CSSValueThin:
return LineWidth::snapLengthAsBorderWidth(1.0f * state.style().usedZoom(), state.document().deviceScaleFactor());
case CSSValueMedium:
return LineWidth::snapLengthAsBorderWidth(3.0f * state.style().usedZoom(), state.document().deviceScaleFactor());
case CSSValueThick:
return LineWidth::snapLengthAsBorderWidth(5.0f * state.style().usedZoom(), state.document().deviceScaleFactor());
default:
state.setCurrentPropertyInvalidAtComputedValueTime();
return LineWidth::Length { 3.0f };
}
}
return LineWidth::snapLengthAsBorderWidth(toStyleFromCSSValue<LineWidth::Length>(state, *primitiveValue), state.document().deviceScaleFactor());
}
// MARK: - Blending
auto Blending<LineWidth>::blend(const LineWidth& a, const LineWidth& b, const RenderStyle& aStyle, const RenderStyle& bStyle, const Interpolation::Context& context) -> LineWidth
{
auto blendedValue = Style::blend(a.value, b.value, aStyle, bStyle, context);
if (RefPtr document = context.client.document())
return LineWidth::snapLengthAsBorderWidth(blendedValue, document->deviceScaleFactor());
return blendedValue;
}
// MARK: - Evaluate
auto Evaluation<LineWidthBox, FloatBoxExtent>::operator()(const LineWidthBox& value, ZoomNeeded zoom) -> FloatBoxExtent
{
return {
evaluate<float>(value.top(), zoom),
evaluate<float>(value.right(), zoom),
evaluate<float>(value.bottom(), zoom),
evaluate<float>(value.left(), zoom),
};
}
auto Evaluation<LineWidthBox, LayoutBoxExtent>::operator()(const LineWidthBox& value, ZoomNeeded zoom) -> LayoutBoxExtent
{
return {
evaluate<LayoutUnit>(value.top(), zoom),
evaluate<LayoutUnit>(value.right(), zoom),
evaluate<LayoutUnit>(value.bottom(), zoom),
evaluate<LayoutUnit>(value.left(), zoom),
};
}
} // namespace Style
} // namespace WebCore
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