Move rendering/RenderLayer* to layout/

Source/core/rendering/RenderLayerClipper.cpp

Index: Source/core/rendering/RenderLayerClipper.cpp
diff --git a/Source/core/rendering/RenderLayerClipper.cpp b/Source/core/rendering/RenderLayerClipper.cpp
deleted file mode 100644
index 3a364ebf3c2ab6f25fc4f58bd9974cb9debb6532..0000000000000000000000000000000000000000
--- a/Source/core/rendering/RenderLayerClipper.cpp
+++ /dev/null
@@ -1,374 +0,0 @@
-/*
- * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
- *
- * Portions are Copyright (C) 1998 Netscape Communications Corporation.
- *
- * Other contributors:
- *   Robert O'Callahan <roc+@cs.cmu.edu>
- *   David Baron <dbaron@fas.harvard.edu>
- *   Christian Biesinger <cbiesinger@web.de>
- *   Randall Jesup <rjesup@wgate.com>
- *   Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
- *   Josh Soref <timeless@mac.com>
- *   Boris Zbarsky <bzbarsky@mit.edu>
- *
- * 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
- *
- * Alternatively, the contents of this file may be used under the terms
- * of either the Mozilla Public License Version 1.1, found at
- * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
- * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
- * (the "GPL"), in which case the provisions of the MPL or the GPL are
- * applicable instead of those above.  If you wish to allow use of your
- * version of this file only under the terms of one of those two
- * licenses (the MPL or the GPL) and not to allow others to use your
- * version of this file under the LGPL, indicate your decision by
- * deletingthe provisions above and replace them with the notice and
- * other provisions required by the MPL or the GPL, as the case may be.
- * If you do not delete the provisions above, a recipient may use your
- * version of this file under any of the LGPL, the MPL or the GPL.
- */
-
-#include "config.h"
-#include "core/rendering/RenderLayerClipper.h"
-
-#include "core/frame/Settings.h"
-#include "core/rendering/RenderLayer.h"
-#include "core/rendering/RenderView.h"
-
-namespace blink {
-
-static void adjustClipRectsForChildren(const RenderObject& renderer, ClipRects& clipRects)
-{
-    EPosition position = renderer.style()->position();
-    // A fixed object is essentially the root of its containing block hierarchy, so when
-    // we encounter such an object, we reset our clip rects to the fixedClipRect.
-    if (position == FixedPosition) {
-        clipRects.setPosClipRect(clipRects.fixedClipRect());
-        clipRects.setOverflowClipRect(clipRects.fixedClipRect());
-        clipRects.setFixed(true);
-    } else if (position == RelativePosition) {
-        clipRects.setPosClipRect(clipRects.overflowClipRect());
-    } else if (position == AbsolutePosition) {
-        clipRects.setOverflowClipRect(clipRects.posClipRect());
-    }
-}
-
-static void applyClipRects(const ClipRectsContext& context, RenderObject& renderer, LayoutPoint offset, ClipRects& clipRects)
-{
-    ASSERT(renderer.hasOverflowClip() || renderer.hasClip());
-
-    RenderView* view = renderer.view();
-    ASSERT(view);
-    if (clipRects.fixed() && context.rootLayer->renderer() == view)
-        offset -= view->frameView()->scrollOffsetForViewportConstrainedObjects();
-
-    if (renderer.hasOverflowClip()) {
-        ClipRect newOverflowClip = toRenderBox(renderer).overflowClipRect(offset, context.scrollbarRelevancy);
-        newOverflowClip.setHasRadius(renderer.style()->hasBorderRadius());
-        clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
-        if (renderer.isPositioned())
-            clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
-    }
-
-    if (renderer.hasClip()) {
-        LayoutRect newClip = toRenderBox(renderer).clipRect(offset);
-        clipRects.setPosClipRect(intersection(newClip, clipRects.posClipRect()));
-        clipRects.setOverflowClipRect(intersection(newClip, clipRects.overflowClipRect()));
-        clipRects.setFixedClipRect(intersection(newClip, clipRects.fixedClipRect()));
-    }
-}
-
-RenderLayerClipper::RenderLayerClipper(RenderLayerModelObject& renderer)
-    : m_renderer(renderer)
-{
-}
-
-ClipRects* RenderLayerClipper::clipRectsIfCached(const ClipRectsContext& context) const
-{
-    ASSERT(context.usesCache());
-    if (!m_cache)
-        return 0;
-    ClipRectsCache::Entry& entry = m_cache->get(context.cacheSlot);
-    // FIXME: We used to ASSERT that we always got a consistent root layer.
-    // We should add a test that has an inconsistent root. See
-    // http://crbug.com/366118 for an example.
-    if (context.rootLayer != entry.root)
-        return 0;
-    ASSERT(entry.scrollbarRelevancy == context.scrollbarRelevancy);
-
-#ifdef CHECK_CACHED_CLIP_RECTS
-    // This code is useful to check cached clip rects, but is too expensive to leave enabled in debug builds by default.
-    ClipRectsContext tempContext(context);
-    tempContext.cacheSlot = UncachedClipRects;
-    RefPtr<ClipRects> clipRects = ClipRects::create();
-    calculateClipRects(tempContext, *clipRects);
-    ASSERT(clipRects == *entry.clipRects);
-#endif
-
-    return entry.clipRects.get();
-}
-
-ClipRects* RenderLayerClipper::storeClipRectsInCache(const ClipRectsContext& context, ClipRects* parentClipRects, const ClipRects& clipRects) const
-{
-    ClipRectsCache::Entry& entry = cache().get(context.cacheSlot);
-    entry.root = context.rootLayer;
-#if ENABLE(ASSERT)
-    entry.scrollbarRelevancy = context.scrollbarRelevancy;
-#endif
-
-    if (parentClipRects) {
-        // If our clip rects match the clip rects of our parent, we share storage.
-        if (clipRects == *parentClipRects) {
-            entry.clipRects = parentClipRects;
-            return parentClipRects;
-        }
-    }
-
-    entry.clipRects = ClipRects::create(clipRects);
-    return entry.clipRects.get();
-}
-
-ClipRects* RenderLayerClipper::getClipRects(const ClipRectsContext& context) const
-{
-    if (ClipRects* result = clipRectsIfCached(context))
-        return result;
-
-    // Note that it's important that we call getClipRects on our parent
-    // before we call calculateClipRects so that calculateClipRects will hit
-    // the cache.
-    ClipRects* parentClipRects = 0;
-    if (context.rootLayer != m_renderer.layer() && m_renderer.layer()->parent())
-        parentClipRects = m_renderer.layer()->parent()->clipper().getClipRects(context);
-
-    RefPtr<ClipRects> clipRects = ClipRects::create();
-    calculateClipRects(context, *clipRects);
-    return storeClipRectsInCache(context, parentClipRects, *clipRects);
-}
-
-void RenderLayerClipper::clearClipRectsIncludingDescendants()
-{
-    m_cache = nullptr;
-
-    for (RenderLayer* layer = m_renderer.layer()->firstChild(); layer; layer = layer->nextSibling())
-        layer->clipper().clearClipRectsIncludingDescendants();
-}
-
-void RenderLayerClipper::clearClipRectsIncludingDescendants(ClipRectsCacheSlot cacheSlot)
-{
-    if (m_cache)
-        m_cache->clear(cacheSlot);
-
-    for (RenderLayer* layer = m_renderer.layer()->firstChild(); layer; layer = layer->nextSibling())
-        layer->clipper().clearClipRectsIncludingDescendants(cacheSlot);
-}
-
-LayoutRect RenderLayerClipper::childrenClipRect() const
-{
-    // FIXME: border-radius not accounted for.
-    // FIXME: Regions not accounted for.
-    RenderLayer* clippingRootLayer = clippingRootForPainting();
-    LayoutRect layerBounds;
-    ClipRect backgroundRect, foregroundRect, outlineRect;
-    // Need to use uncached clip rects, because the value of 'dontClipToOverflow' may be different from the painting path (<rdar://problem/11844909>).
-    ClipRectsContext context(clippingRootLayer, UncachedClipRects);
-    calculateRects(context, m_renderer.view()->unscaledDocumentRect(), layerBounds, backgroundRect, foregroundRect, outlineRect);
-    return clippingRootLayer->renderer()->localToAbsoluteQuad(FloatQuad(foregroundRect.rect())).enclosingBoundingBox();
-}
-
-LayoutRect RenderLayerClipper::localClipRect() const
-{
-    // FIXME: border-radius not accounted for.
-    RenderLayer* clippingRootLayer = clippingRootForPainting();
-    LayoutRect layerBounds;
-    ClipRect backgroundRect, foregroundRect, outlineRect;
-    ClipRectsContext context(clippingRootLayer, PaintingClipRects);
-    calculateRects(context, LayoutRect::infiniteIntRect(), layerBounds, backgroundRect, foregroundRect, outlineRect);
-
-    LayoutRect clipRect = backgroundRect.rect();
-    if (clipRect == LayoutRect::infiniteIntRect())
-        return clipRect;
-
-    LayoutPoint clippingRootOffset;
-    m_renderer.layer()->convertToLayerCoords(clippingRootLayer, clippingRootOffset);
-    clipRect.moveBy(-clippingRootOffset);
-
-    return clipRect;
-}
-
-void RenderLayerClipper::calculateRects(const ClipRectsContext& context, const LayoutRect& paintDirtyRect, LayoutRect& layerBounds,
-    ClipRect& backgroundRect, ClipRect& foregroundRect, ClipRect& outlineRect, const LayoutPoint* offsetFromRoot) const
-{
-    bool isClippingRoot = m_renderer.layer() == context.rootLayer;
-
-    if (!isClippingRoot && m_renderer.layer()->parent()) {
-        backgroundRect = backgroundClipRect(context);
-        backgroundRect.move(roundedIntSize(context.subPixelAccumulation));
-        backgroundRect.intersect(paintDirtyRect);
-    } else {
-        backgroundRect = paintDirtyRect;
-    }
-
-    foregroundRect = backgroundRect;
-    outlineRect = backgroundRect;
-
-    LayoutPoint offset;
-    if (offsetFromRoot)
-        offset = *offsetFromRoot;
-    else
-        m_renderer.layer()->convertToLayerCoords(context.rootLayer, offset);
-    layerBounds = LayoutRect(offset, LayoutSize(m_renderer.layer()->size()));
-
-    // Update the clip rects that will be passed to child layers.
-    if (m_renderer.hasOverflowClip()) {
-        // This layer establishes a clip of some kind.
-        if (!isClippingRoot || context.respectOverflowClip == RespectOverflowClip) {
-            foregroundRect.intersect(toRenderBox(m_renderer).overflowClipRect(offset, context.scrollbarRelevancy));
-            if (m_renderer.style()->hasBorderRadius())
-                foregroundRect.setHasRadius(true);
-        }
-
-        // If we establish an overflow clip at all, then go ahead and make sure our background
-        // rect is intersected with our layer's bounds including our visual overflow,
-        // since any visual overflow like box-shadow or border-outset is not clipped by overflow:auto/hidden.
-        if (toRenderBox(m_renderer).hasVisualOverflow()) {
-            // FIXME: Perhaps we should be propagating the borderbox as the clip rect for children, even though
-            //        we may need to inflate our clip specifically for shadows or outsets.
-            // FIXME: Does not do the right thing with CSS regions yet, since we don't yet factor in the
-            // individual region boxes as overflow.
-            LayoutRect layerBoundsWithVisualOverflow = toRenderBox(m_renderer).visualOverflowRect();
-            toRenderBox(m_renderer).flipForWritingMode(layerBoundsWithVisualOverflow); // Layers are in physical coordinates, so the overflow has to be flipped.
-            layerBoundsWithVisualOverflow.moveBy(offset);
-            if (!isClippingRoot || context.respectOverflowClip == RespectOverflowClip)
-                backgroundRect.intersect(layerBoundsWithVisualOverflow);
-        } else {
-            LayoutRect bounds = toRenderBox(m_renderer).borderBoxRect();
-            bounds.moveBy(offset);
-            if (!isClippingRoot || context.respectOverflowClip == RespectOverflowClip)
-                backgroundRect.intersect(bounds);
-        }
-    }
-
-    // CSS clip (different than clipping due to overflow) can clip to any box, even if it falls outside of the border box.
-    if (m_renderer.hasClip()) {
-        // Clip applies to *us* as well, so go ahead and update the damageRect.
-        LayoutRect newPosClip = toRenderBox(m_renderer).clipRect(offset);
-        backgroundRect.intersect(newPosClip);
-        foregroundRect.intersect(newPosClip);
-        outlineRect.intersect(newPosClip);
-    }
-}
-
-void RenderLayerClipper::calculateClipRects(const ClipRectsContext& context, ClipRects& clipRects) const
-{
-    bool rootLayerScrolls = m_renderer.document().settings() && m_renderer.document().settings()->rootLayerScrolls();
-    if (!m_renderer.layer()->parent() && !rootLayerScrolls) {
-        // The root layer's clip rect is always infinite.
-        clipRects.reset(LayoutRect::infiniteIntRect());
-        return;
-    }
-
-    bool isClippingRoot = m_renderer.layer() == context.rootLayer;
-
-    // For transformed layers, the root layer was shifted to be us, so there is no need to
-    // examine the parent. We want to cache clip rects with us as the root.
-    RenderLayer* parentLayer = !isClippingRoot ? m_renderer.layer()->parent() : 0;
-
-    // Ensure that our parent's clip has been calculated so that we can examine the values.
-    if (parentLayer) {
-        // FIXME: Why don't we just call getClipRects here?
-        if (context.usesCache() && parentLayer->clipper().cachedClipRects(context)) {
-            clipRects = *parentLayer->clipper().cachedClipRects(context);
-        } else {
-            parentLayer->clipper().calculateClipRects(context, clipRects);
-        }
-    } else {
-        clipRects.reset(LayoutRect::infiniteIntRect());
-    }
-
-    adjustClipRectsForChildren(m_renderer, clipRects);
-
-    if ((m_renderer.hasOverflowClip() && (context.respectOverflowClip == RespectOverflowClip || !isClippingRoot)) || m_renderer.hasClip()) {
-        // This offset cannot use convertToLayerCoords, because sometimes our rootLayer may be across
-        // some transformed layer boundary, for example, in the RenderLayerCompositor overlapMap, where
-        // clipRects are needed in view space.
-        applyClipRects(context, m_renderer, roundedLayoutPoint(m_renderer.localToContainerPoint(FloatPoint(), context.rootLayer->renderer())), clipRects);
-    }
-}
-
-static ClipRect backgroundClipRectForPosition(const ClipRects& parentRects, EPosition position)
-{
-    if (position == FixedPosition)
-        return parentRects.fixedClipRect();
-
-    if (position == AbsolutePosition)
-        return parentRects.posClipRect();
-
-    return parentRects.overflowClipRect();
-}
-
-ClipRect RenderLayerClipper::backgroundClipRect(const ClipRectsContext& context) const
-{
-    ASSERT(m_renderer.layer()->parent());
-    ASSERT(m_renderer.view());
-
-    RefPtr<ClipRects> parentClipRects = ClipRects::create();
-    if (m_renderer.layer() == context.rootLayer)
-        parentClipRects->reset(LayoutRect::infiniteIntRect());
-    else
-        m_renderer.layer()->parent()->clipper().getOrCalculateClipRects(context, *parentClipRects);
-
-    ClipRect result = backgroundClipRectForPosition(*parentClipRects, m_renderer.style()->position());
-
-    // Note: infinite clipRects should not be scrolled here, otherwise they will accidentally no longer be considered infinite.
-    if (parentClipRects->fixed() && context.rootLayer->renderer() == m_renderer.view() && result != LayoutRect::infiniteIntRect())
-        result.move(m_renderer.view()->frameView()->scrollOffsetForViewportConstrainedObjects());
-
-    return result;
-}
-
-void RenderLayerClipper::getOrCalculateClipRects(const ClipRectsContext& context, ClipRects& clipRects) const
-{
-    if (context.usesCache())
-        clipRects = *getClipRects(context);
-    else
-        calculateClipRects(context, clipRects);
-}
-
-RenderLayer* RenderLayerClipper::clippingRootForPainting() const
-{
-    const RenderLayer* current = m_renderer.layer();
-    // FIXME: getting rid of current->hasCompositedLayerMapping() here breaks the
-    // compositing/backing/no-backing-for-clip.html layout test, because there is a
-    // "composited but paints into ancestor" layer involved. However, it doesn't make sense that
-    // that check would be appropriate here but not inside the while loop below.
-    if (current->isPaintInvalidationContainer() || current->hasCompositedLayerMapping())
-        return const_cast<RenderLayer*>(current);
-
-    while (current) {
-        if (current->isRootLayer())
-            return const_cast<RenderLayer*>(current);
-
-        current = current->compositingContainer();
-        ASSERT(current);
-        if (current->transform() || current->isPaintInvalidationContainer())
-            return const_cast<RenderLayer*>(current);
-    }
-
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
-} // namespace blink