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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,
* 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 <WebCore/AnimationUtilities.h>
#include <WebCore/StyleShadow.h>
namespace WebCore {
namespace Style {
// Generic implementation of interpolation for shadow lists for use by both `Style::BoxShadow` and `Style::TextShadow`.
// https://www.w3.org/TR/web-animations-1/#animating-shadow-lists
template<typename ShadowsType, typename MatchingShadows>
struct ShadowInterpolation {
using ShadowListType = typename ShadowsType::List;
using ShadowType = typename ShadowListType::value_type;
static bool canInterpolate(const ShadowsType& fromShadows, const ShadowsType& toShadows, CompositeOperation compositeOperation)
{
if (compositeOperation != CompositeOperation::Replace)
return true;
// The only scenario where we can't interpolate is if specified items don't have the same shadow style.
auto fromLength = fromShadows.size();
auto toLength = toShadows.size();
// FIXME: Something like LLVM ADT's zip_shortest (https://llvm.org/doxygen/structllvm_1_1detail_1_1zip__shortest.html) would allow this to be done without indexing:
//
// return std::ranges::all_of(
// zip_shortest(makeReversedRange(fromShadows), makeReversedRange(toShadows)),
// [](const auto& pair) {
// return shadowStyle(std::get<0>(pair)) == shadowStyle(std::get<1>(pair));
// }
// );
size_t minLength = std::min(fromLength, toLength);
for (size_t i = 0; i < minLength; ++i) {
auto fromIndex = fromLength - i - 1;
auto toIndex = toLength - i - 1;
if (shadowStyle(fromShadows[fromIndex]) != shadowStyle(toShadows[toIndex]))
return false;
}
return true;
}
static auto interpolate(const ShadowsType& fromShadows, const ShadowsType& toShadows, const RenderStyle& fromStyle, const RenderStyle& toStyle, const BlendingContext& context) -> ShadowsType
{
if (context.isDiscrete) {
ASSERT(!context.progress || context.progress == 1.0);
return context.progress ? toShadows : fromShadows;
}
auto fromLength = fromShadows.size();
auto toLength = toShadows.size();
if (!fromLength && !toLength)
return CSS::Keyword::None { };
if (fromLength == toLength)
return blendMatchedShadowLists(fromShadows, toShadows, fromLength, fromStyle, toStyle, context);
return blendMismatchedShadowLists(fromShadows, toShadows, fromLength, toLength, fromStyle, toStyle, context);
}
static auto addShadowLists(const ShadowsType& fromShadows, const ShadowsType& toShadows, size_t fromLength, size_t toLength) -> ShadowsType
{
return ShadowListType::createWithSizeFromGenerator(fromLength + toLength, [&](auto index) -> ShadowType {
if (index < toLength)
return toShadows[index];
return fromShadows[index - toLength];
});
}
static auto blendMatchedShadowLists(const ShadowsType& fromShadows, const ShadowsType& toShadows, size_t length, const RenderStyle& fromStyle, const RenderStyle& toStyle, const BlendingContext& context) -> ShadowsType
{
// `from` or `to` might be empty in which case we don't want to do additivity, but do replace instead.
if (!fromShadows.isNone() && !toShadows.isNone() && context.compositeOperation == CompositeOperation::Add)
return addShadowLists(fromShadows, toShadows, length, length);
return ShadowListType::createWithSizeFromGenerator(length, [&](auto index) -> ShadowType {
return Style::blend(fromShadows[index], toShadows[index], fromStyle, toStyle, context);
});
}
static auto blendMismatchedShadowLists(const ShadowsType& fromShadows, const ShadowsType& toShadows, size_t fromLength, size_t toLength, const RenderStyle& fromStyle, const RenderStyle& toStyle, const BlendingContext& context) -> ShadowsType
{
if (!fromShadows.isNone() && !toShadows.isNone() && context.compositeOperation != CompositeOperation::Replace)
return addShadowLists(fromShadows, toShadows, fromLength, toLength);
auto maxLength = std::max(fromLength, toLength);
return ShadowListType::createWithSizeFromGenerator(maxLength, [&](auto index) -> ShadowType {
auto indexFromEnd = maxLength - index - 1;
bool hasFrom = indexFromEnd < fromLength;
bool hasTo = indexFromEnd < toLength;
if (hasFrom && hasTo) {
const auto& fromShadow = fromShadows[index - (maxLength - fromLength)];
const auto& toShadow = toShadows[index - (maxLength - toLength)];
return Style::blend(fromShadow, toShadow, fromStyle, toStyle, context);
} else if (hasFrom) {
const auto& fromShadow = fromShadows[index - (maxLength - fromLength)];
const auto& toShadow = MatchingShadows::shadowForInterpolation(fromShadow);
return Style::blend(fromShadow, toShadow, fromStyle, toStyle, context);
} else if (hasTo) {
const auto& toShadow = toShadows[index - (maxLength - toLength)];
const auto& fromShadow = MatchingShadows::shadowForInterpolation(toShadow);
return Style::blend(fromShadow, toShadow, fromStyle, toStyle, context);
}
RELEASE_ASSERT_NOT_REACHED();
});
}
};
} // namespace Style
} // namespace WebCore
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