/**
 * Copyright (C) 2003-2023 Apple Inc. All rights reserved.
 * Copyright (C) 2023 Igalia S.L.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#pragma once

#include "RenderElementInlines.h"
#include "RenderElementStyleInlines.h"
#include "RenderLayer.h"
#include "RenderObjectInlines.h"
#include "RenderSVGResourceClipper.h"
#include "RenderView.h"
#include "SVGGraphicsElement.h"
#include "Settings.h"
#include <wtf/CheckedPtr.h>

namespace WebCore {

inline bool RenderLayer::canPaintTransparencyWithSetOpacity() const { return isBitmapOnly() && !hasNonOpacityTransparency() && !hasFilter(); }
inline bool RenderLayer::hasBackdropFilter() const { return renderer().hasBackdropFilter(); }
inline bool RenderLayer::hasFilter() const { return renderer().hasFilter(); }
inline bool RenderLayer::isTransparent() const { return renderer().isTransparent() || renderer().hasMask(); }
inline bool RenderLayer::overlapBoundsIncludeChildren() const { return hasFilter() && renderer().style().filter().hasFilterThatMovesPixels(); }
inline bool RenderLayer::preserves3D() const { return renderer().style().usedTransformStyle3D() == TransformStyle3D::Preserve3D; }
inline int RenderLayer::zIndex() const { return renderer().style().usedZIndex().tryValue().value_or(0).value; }
inline Page& RenderLayer::page() const { return renderer().page(); }

#if HAVE(CORE_MATERIAL)
inline bool RenderLayer::hasAppleVisualEffect() const { return renderer().hasAppleVisualEffect(); }
inline bool RenderLayer::hasAppleVisualEffectRequiringBackdropFilter() const { return renderer().hasAppleVisualEffectRequiringBackdropFilter(); }
#endif

inline bool RenderLayer::isViewportConstrained() const
{
    return renderer().isFixedPositioned() || renderer().isStickilyPositioned();
}

inline bool RenderLayer::isTransformed() const
{
    // If the scroll offset is present, a transform is applied on top of existing
    // transforms from the renderer.
    return renderer().isTransformed() || m_anchorScrollAdjustment;
}

inline bool RenderLayer::hasBlendMode() const { return renderer().hasBlendMode(); } // FIXME: Why ask the renderer this given we have m_blendMode?

inline bool RenderLayer::canUseOffsetFromAncestor() const
{
    // FIXME: This really needs to know if there are transforms on this layer and any of the layers between it and the ancestor in question.
    return !isTransformed() && !renderer().isRenderOrLegacyRenderSVGRoot();
}

inline bool RenderLayer::paintsWithTransparency(OptionSet<PaintBehavior> paintBehavior) const
{
    if (!renderer().isTransparent() && !hasNonOpacityTransparency())
        return false;
    return (paintBehavior & PaintBehavior::FlattenCompositingLayers) || !isComposited();
}

inline bool RenderLayer::hasNonOpacityTransparency() const
{
    if (renderer().hasMask())
        return true;

    if (hasBlendMode() || isolatesBlending())
        return true;

    if (!renderer().document().settings().layerBasedSVGEngineEnabled())
        return false;

    // SVG clip-paths may use clipping masks, if so, flag this layer as transparent.
    if (CheckedPtr svgClipper = renderer().svgClipperResourceFromStyle(); svgClipper && !svgClipper->shouldApplyPathClipping())
        return true;

    return false;
}

inline const LayoutPoint& RenderLayer::location() const LIFETIME_BOUND
{
    ASSERT(!renderer().layerAccessPreventedSlow());
    return m_topLeft;
}

inline const IntSize& RenderLayer::size() const LIFETIME_BOUND
{
    ASSERT(!renderer().layerAccessPreventedSlow());
    return m_layerSize;
}

inline LayoutRect RenderLayer::rect() const
{
    return LayoutRect(location(), size());
}

} // namespace WebCore
