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/*
* Copyright (C) 2007-2023 Apple Inc. All rights reserved.
* Copyright (C) 2012, 2013 Adobe Systems Incorporated. All rights reserved.
* Copyright (C) 2025 Sam Weinig. All rights reserved.
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
*/
#pragma once
#include "CSSPropertyNames.h"
#include "CachedImage.h"
#include "ColorBlending.h"
#include "Document.h"
#include "FloatConversion.h"
#include "FontCascade.h"
#include "FontSelectionAlgorithm.h"
#include "FontSelectionValueInlines.h"
#include "FontTaggedSettings.h"
#include "IdentityTransformOperation.h"
#include "Logging.h"
#include "Matrix3DTransformOperation.h"
#include "MatrixTransformOperation.h"
#include "PathOperation.h"
#include "RenderBox.h"
#include "RenderStyleSetters.h"
#include "ScopedName.h"
#include "Settings.h"
#include "StyleCalculationValue.h"
#include "StyleDynamicRangeLimit.h"
#include "StyleImageWrapper.h"
#include "StyleInterpolationClient.h"
#include "StyleInterpolationContext.h"
#include "StyleLengthWrapper+Blending.h"
#include "StylePrimitiveNumericTypes+Blending.h"
#include "StyleResolver.h"
#include <algorithm>
#include <wtf/MathExtras.h>
#include <wtf/PointerComparison.h>
namespace WebCore::Style::Interpolation {
inline int blendFunc(int from, int to, const Context& context)
{
return WebCore::blend(from, to, context);
}
inline double blendFunc(double from, double to, const Context& context)
{
return WebCore::blend(from, to, context);
}
inline float blendFunc(float from, float to, const Context& context)
{
if (context.iterationCompositeOperation == IterationCompositeOperation::Accumulate && context.currentIteration) {
auto iterationIncrement = context.currentIteration * to;
from += iterationIncrement;
to += iterationIncrement;
}
if (context.compositeOperation == CompositeOperation::Replace)
return narrowPrecisionToFloat(from + (to - from) * context.progress);
return narrowPrecisionToFloat(from + from + (to - from) * context.progress);
}
inline WebCore::Color blendFunc(const WebCore::Color& from, const WebCore::Color& to, const Context& context)
{
return WebCore::blend(from, to, context);
}
inline ContentVisibility blendFunc(ContentVisibility from, ContentVisibility to, const Context& context)
{
// https://drafts.csswg.org/css-contain-3/#content-visibility-animation
// In general, the content-visibility property's animation type is discrete. However, similar to interpolation of
// visibility, during interpolation between hidden and any other content-visibility value, p values between 0 and 1
// map to the non-hidden value.
if (from != ContentVisibility::Hidden && to != ContentVisibility::Hidden)
return context.progress < 0.5 ? from : to;
if (context.progress <= 0)
return from;
if (context.progress >= 1)
return to;
return from == ContentVisibility::Hidden ? to : from;
}
inline Visibility blendFunc(Visibility from, Visibility to, const Context& context)
{
if (context.isDiscrete) {
ASSERT(!context.progress || context.progress == 1.0);
return context.progress ? to : from;
}
// Any non-zero result means we consider the object to be visible. Only at 0 do we consider the object to be
// invisible. The invisible value we use (Visibility::Hidden vs. Visibility::Collapse) depends on the specified from/to values.
double fromVal = from == Visibility::Visible ? 1. : 0.;
double toVal = to == Visibility::Visible ? 1. : 0.;
if (fromVal == toVal)
return to;
// The composite operation here is irrelevant.
double result = blendFunc(fromVal, toVal, { context.property, context.progress, false, CompositeOperation::Replace, IterationCompositeOperation::Replace, 0, { }, { }, context.client });
return result > 0. ? Visibility::Visible : (to != Visibility::Visible ? to : from);
}
inline DisplayType blendFunc(DisplayType from, DisplayType to, const Context& context)
{
// https://drafts.csswg.org/css-display-4/#display-animation
// In general, the display property's animation type is discrete. However, similar to interpolation of
// visibility, during interpolation between none and any other display value, p values between 0 and 1
// map to the non-none value. Additionally, the element is inert as long as its display value would
// compute to none when ignoring the Transitions and Animations cascade origins.
if (from != DisplayType::None && to != DisplayType::None)
return context.progress < 0.5 ? from : to;
if (context.progress <= 0)
return from;
if (context.progress >= 1)
return to;
return from == DisplayType::None ? to : from;
}
} // namespace WebCore::Style::Interpolation
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