| /* |
| * 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 "sky/engine/core/rendering/RenderLayerClipper.h" |
| |
| #include "sky/engine/core/rendering/RenderLayer.h" |
| #include "sky/engine/core/rendering/RenderView.h" |
| |
| namespace blink { |
| |
| RenderLayerClipper::RenderLayerClipper(RenderBox& 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; |
| |
| #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; |
| ClipRects clipRects; |
| 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 (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); |
| |
| ClipRects clipRects; |
| 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::localClipRect() const |
| { |
| // FIXME: border-radius not accounted for. |
| RenderLayer* clippingRootLayer = clippingRootForPainting(); |
| LayoutRect layerBounds; |
| ClipRect backgroundRect; |
| ClipRectsContext context(clippingRootLayer, PaintingClipRects); |
| calculateRects(context, PaintInfo::infiniteRect(), layerBounds, backgroundRect); |
| |
| LayoutRect clipRect = backgroundRect.rect(); |
| if (clipRect == PaintInfo::infiniteRect()) |
| 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, 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; |
| } |
| |
| LayoutPoint offset; |
| if (offsetFromRoot) |
| offset = *offsetFromRoot; |
| else |
| m_renderer.layer()->convertToLayerCoords(context.rootLayer, offset); |
| layerBounds = LayoutRect(offset, m_renderer.layer()->size()); |
| |
| // Update the clip rects that will be passed to child layers. |
| if (m_renderer.hasOverflowClip()) { |
| // 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 (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 = m_renderer.visualOverflowRect(); |
| layerBoundsWithVisualOverflow.moveBy(offset); |
| backgroundRect.intersect(layerBoundsWithVisualOverflow); |
| } else { |
| LayoutRect bounds = m_renderer.borderBoxRect(); |
| bounds.moveBy(offset); |
| 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 = m_renderer.clipRect(offset); |
| backgroundRect.intersect(newPosClip); |
| } |
| } |
| |
| void RenderLayerClipper::calculateClipRects(const ClipRectsContext& context, ClipRects& clipRects) const |
| { |
| if (!m_renderer.layer()->parent()) { |
| // The root layer's clip rect is always infinite. |
| clipRects.reset(PaintInfo::infiniteRect()); |
| 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(PaintInfo::infiniteRect()); |
| } |
| |
| if (m_renderer.style()->position() == AbsolutePosition) { |
| clipRects.setOverflowClipRect(clipRects.posClipRect()); |
| } |
| |
| // 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. |
| LayoutPoint offset = roundedLayoutPoint(m_renderer.localToContainerPoint(FloatPoint(), context.rootLayer->renderer())); |
| if (m_renderer.hasOverflowClip()) { |
| ClipRect newOverflowClip = m_renderer.overflowClipRect(offset); |
| newOverflowClip.setHasRadius(m_renderer.style()->hasBorderRadius()); |
| clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect())); |
| if (m_renderer.isPositioned()) |
| clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect())); |
| } |
| |
| if (m_renderer.hasClip()) { |
| LayoutRect newClip = m_renderer.clipRect(offset); |
| clipRects.setPosClipRect(intersection(newClip, clipRects.posClipRect())); |
| clipRects.setOverflowClipRect(intersection(newClip, clipRects.overflowClipRect())); |
| } |
| } |
| |
| ClipRect RenderLayerClipper::backgroundClipRect(const ClipRectsContext& context) const |
| { |
| ASSERT(m_renderer.layer()->parent()); |
| ASSERT(m_renderer.view()); |
| |
| ClipRects parentClipRects; |
| if (m_renderer.layer() == context.rootLayer) |
| parentClipRects.reset(PaintInfo::infiniteRect()); |
| else |
| m_renderer.layer()->parent()->clipper().getOrCalculateClipRects(context, parentClipRects); |
| |
| if (m_renderer.style()->position() == AbsolutePosition) |
| return parentClipRects.posClipRect(); |
| return parentClipRects.overflowClipRect(); |
| } |
| |
| 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(); |
| while (current) { |
| if (current->isRootLayer()) |
| return const_cast<RenderLayer*>(current); |
| |
| current = current->compositingContainer(); |
| ASSERT(current); |
| if (current->renderer()->transform()) |
| return const_cast<RenderLayer*>(current); |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| } // namespace blink |