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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2005, 2006, 2007, 2008, 2014 Apple Inc. All rights reserved.
* Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include <WebCore/GraphicsTypes.h>
#include <WebCore/RenderStyleConstants.h>
#include <WebCore/StyleBackgroundSize.h>
#include <WebCore/StyleCoordinatedValueList.h>
#include <WebCore/StyleImageOrNone.h>
#include <WebCore/StylePosition.h>
#include <WebCore/StyleRepeatStyle.h>
#include <ranges>
namespace WebCore {
class RenderElement;
namespace Style {
// Utilities for working with the BackgroundLayers and MaskLayers types.
template<typename T> concept FillLayer = CoordinatedValueListValue<T> && requires(T value) {
{ value.image() } -> std::same_as<const ImageOrNone&>;
{ value.hasImage() } -> std::same_as<bool>;
{ value.size() } -> std::same_as<const BackgroundSize&>;
{ value.attachment() } -> std::same_as<FillAttachment>;
{ value.clip() } -> std::same_as<FillBox>;
{ value.setClipMax(std::declval<FillBox>()) };
};
template<FillLayer T>
void computeClipMax(const CoordinatedValueList<T>& list)
{
auto computedClipMax = FillBox::NoClip;
for (auto& layer : list.usedValues() | std::views::reverse) {
computedClipMax = clipMax(computedClipMax, layer.clip());
layer.setClipMax(computedClipMax);
}
}
template<FillLayer T>
bool imagesAreLoaded(const CoordinatedValueList<T>& list, const RenderElement& renderer)
{
return std::ranges::all_of(list.usedValues(), [&renderer](auto& layer) {
RefPtr image = layer.image().tryStyleImage();
return !image || image->isLoaded(&renderer);
});
}
template<FillLayer T>
bool hasImageInAnyLayer(const CoordinatedValueList<T>& list)
{
return std::ranges::any_of(list.usedValues(), [](auto& layer) {
return layer.hasImage();
});
}
template<FillLayer T>
bool hasImageWithAttachment(const CoordinatedValueList<T>& list, FillAttachment attachment)
{
return std::ranges::any_of(list.usedValues(), [&attachment](auto& layer) {
return layer.hasImage() && layer.attachment() == attachment;
});
}
template<FillLayer T>
bool hasHDRContent(const CoordinatedValueList<T>& list)
{
return std::ranges::any_of(list.usedValues(), [](auto& layer) {
RefPtr image = layer.image().tryStyleImage();
if (auto* cachedImage = image ? image->cachedImage() : nullptr) {
if (cachedImage->hasHDRContent())
return true;
}
return false;
});
}
template<FillLayer T>
bool hasEntirelyFixedBackground(const CoordinatedValueList<T>& list)
{
return std::ranges::all_of(list.usedValues(), [](auto& layer) {
return layer.hasImage() && layer.attachment() == FillAttachment::FixedBackground;
});
}
template<FillLayer T>
bool hasAnyBackgroundClipText(const CoordinatedValueList<T>& list)
{
return std::ranges::any_of(list.usedValues(), [](auto& layer) {
return layer.clip() == FillBox::Text;
});
}
template<FillLayer T>
RefPtr<StyleImage> findLayerUsedImage(const CoordinatedValueList<T>& list, WrappedImagePtr image, bool& isNonEmpty)
{
for (auto& layer : list.usedValues()) {
RefPtr layerImage = layer.image().tryStyleImage();
if (!layerImage || layerImage->data() != image)
continue;
// FIXME: This really needs to compute the tile rect with BackgroundPainter::calculateFillTileSize().
isNonEmpty = WTF::switchOn(layer.size(),
[&](const CSS::Keyword::Cover&) {
return false;
},
[&](const CSS::Keyword::Contain&) {
return false;
},
[&](const Style::BackgroundSize::LengthSize& size) {
auto isAutoOrKnownNonZero = [](auto& length) {
return WTF::switchOn(length,
[](const Style::BackgroundSizeLength::Fixed& fixed) {
return !fixed.isZero();
},
[](const Style::BackgroundSizeLength::Percentage& percentage) {
return !percentage.isZero();
},
[](const Style::BackgroundSizeLength::Calc&) {
return false;
},
[](const CSS::Keyword::Auto&) {
return true;
}
);
};
return isAutoOrKnownNonZero(size.width()) && isAutoOrKnownNonZero(size.height());
}
);
return layerImage;
}
isNonEmpty = false;
return nullptr;
}
} // namespace Style
} // namespace WebCore
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