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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 THE COPYRIGHT HOLDER "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 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 "StyleImageWrapper.h"
#include "AnimationUtilities.h"
#include "CSSValue.h"
#include "StyleCachedImage.h"
#include "StyleCrossfadeImage.h"
#include "StyleFilterImage.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
namespace Style {
// MARK: - Conversion
Ref<CSSValue> CSSValueCreation<ImageWrapper>::operator()(CSSValuePool&, const RenderStyle& style, const ImageWrapper& value)
{
Ref image = value.value;
return image->computedStyleValue(style);
}
// MARK: - Serialization
void Serialize<ImageWrapper>::operator()(StringBuilder& builder, const CSS::SerializationContext& context, const RenderStyle& style, const ImageWrapper& value)
{
Ref image = value.value;
builder.append(image->computedStyleValue(style)->cssText(context));
}
// MARK: - Blending
static ImageWrapper crossfadeBlend(Ref<StyleCachedImage>&& fromStyleImage, Ref<StyleCachedImage>&& toStyleImage, const BlendingContext& context)
{
// If progress is at one of the extremes, we want getComputedStyle to show the image,
// not a completed cross-fade, so we hand back one of the existing images.
if (!context.progress)
return ImageWrapper { WTFMove(fromStyleImage) };
if (context.progress == 1)
return ImageWrapper { WTFMove(toStyleImage) };
if (!fromStyleImage->cachedImage() || !toStyleImage->cachedImage())
return ImageWrapper { WTFMove(toStyleImage) };
return ImageWrapper { StyleCrossfadeImage::create(WTFMove(fromStyleImage), WTFMove(toStyleImage), context.progress, false) };
}
static ImageWrapper filterBlend(RefPtr<StyleImage> inputImage, const Style::Filter& from, const Style::Filter& to, const BlendingContext& context)
{
return ImageWrapper { StyleFilterImage::create(WTFMove(inputImage), Style::blend(from, to, context)) };
}
auto Blending<ImageWrapper>::blend(const ImageWrapper& a, const ImageWrapper& b, const BlendingContext& context) -> ImageWrapper
{
if (!context.progress)
return a;
if (context.progress == 1.0)
return b;
Ref aImage = a.value;
Ref bImage = b.value;
RefPtr aSelectedUnchecked = aImage->selectedImage();
RefPtr bSelectedUnchecked = bImage->selectedImage();
if (!aSelectedUnchecked || !bSelectedUnchecked) {
if (aSelectedUnchecked)
return ImageWrapper { aSelectedUnchecked.releaseNonNull() };
if (bSelectedUnchecked)
return ImageWrapper { bSelectedUnchecked.releaseNonNull() };
return context.progress > 0.5 ? b : a;
}
Ref aSelected = aSelectedUnchecked.releaseNonNull();
Ref bSelected = bSelectedUnchecked.releaseNonNull();
// Interpolation between two generated images. Cross fade for all other cases.
if (auto [aFilter, bFilter] = std::tuple { dynamicDowncast<StyleFilterImage>(aSelected), dynamicDowncast<StyleFilterImage>(bSelected) }; aFilter && bFilter) {
// Interpolation of generated images is only possible if the input images are equal.
// Otherwise fall back to cross fade animation.
if (aFilter->equalInputImages(*bFilter) && is<StyleCachedImage>(aFilter->inputImage()))
return filterBlend(aFilter->inputImage(), aFilter->filter(), bFilter->filter(), context);
} else if (auto [aCrossfade, bCrossfade] = std::tuple { dynamicDowncast<StyleCrossfadeImage>(aSelected), dynamicDowncast<StyleCrossfadeImage>(bSelected) }; aCrossfade && bCrossfade) {
if (aCrossfade->equalInputImages(*bCrossfade)) {
if (RefPtr crossfadeBlend = bCrossfade->blend(*aCrossfade, context))
return ImageWrapper { crossfadeBlend.releaseNonNull() };
}
} else if (auto [aFilter, bCachedImage] = std::tuple { dynamicDowncast<StyleFilterImage>(aSelected), dynamicDowncast<StyleCachedImage>(bSelected) }; aFilter && bCachedImage) {
RefPtr aFilterInputImage = dynamicDowncast<StyleCachedImage>(aFilter->inputImage());
if (aFilterInputImage && bCachedImage->equals(*aFilterInputImage))
return filterBlend(WTFMove(aFilterInputImage), aFilter->filter(), Style::Filter { CSS::Keyword::None { } }, context);
} else if (auto [aCachedImage, bFilter] = std::tuple { dynamicDowncast<StyleCachedImage>(aSelected), dynamicDowncast<StyleFilterImage>(bSelected) }; aCachedImage && bFilter) {
RefPtr bFilterInputImage = dynamicDowncast<StyleCachedImage>(bFilter->inputImage());
if (bFilterInputImage && aCachedImage->equals(*bFilterInputImage))
return filterBlend(WTFMove(bFilterInputImage), Style::Filter { CSS::Keyword::None { } }, bFilter->filter(), context);
}
RefPtr aCachedImage = dynamicDowncast<StyleCachedImage>(aSelected);
RefPtr bCachedImage = dynamicDowncast<StyleCachedImage>(bSelected);
if (aCachedImage && bCachedImage)
return crossfadeBlend(aCachedImage.releaseNonNull(), bCachedImage.releaseNonNull(), context);
// FIXME: Add support for interpolation between two *gradient() functions.
// https://bugs.webkit.org/show_bug.cgi?id=119956
// FIXME: Add support cross fade between cached and generated images.
// https://bugs.webkit.org/show_bug.cgi?id=78293
return ImageWrapper { WTFMove(bSelected) };
}
// MARK: - Logging
WTF::TextStream& operator<<(WTF::TextStream& ts, const ImageWrapper& value)
{
Ref image = value.value;
ts << "image"_s;
if (!image->url().resolved.isEmpty())
ts << '(' << image->url().resolved << ')';
return ts;
}
} // namespace Style
} // namespace WebCore
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