src/third_party/WebKit/Source/core/rendering/RenderLayerRepainter.cpp

   1 /*
   2  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
   3  *
   4  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
   5  *
   6  * Other contributors:
   7  *   Robert O'Callahan <roc+@cs.cmu.edu>
   8  *   David Baron <dbaron@fas.harvard.edu>
   9  *   Christian Biesinger <cbiesinger@web.de>
  10  *   Randall Jesup <rjesup@wgate.com>
  11  *   Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
  12  *   Josh Soref <timeless@mac.com>
  13  *   Boris Zbarsky <bzbarsky@mit.edu>
  14  *
  15  * This library is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU Lesser General Public
  17  * License as published by the Free Software Foundation; either
  18  * version 2.1 of the License, or (at your option) any later version.
  19  *
  20  * This library is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23  * Lesser General Public License for more details.
  24  *
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  26  * License along with this library; if not, write to the Free Software
  27  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  28  *
  29  * Alternatively, the contents of this file may be used under the terms
  30  * of either the Mozilla Public License Version 1.1, found at
  31  * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
  32  * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
  33  * (the "GPL"), in which case the provisions of the MPL or the GPL are
  34  * applicable instead of those above.  If you wish to allow use of your
  35  * version of this file only under the terms of one of those two
  36  * licenses (the MPL or the GPL) and not to allow others to use your
  37  * version of this file under the LGPL, indicate your decision by
  38  * deletingthe provisions above and replace them with the notice and
  39  * other provisions required by the MPL or the GPL, as the case may be.
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  42  */
  43
  44 #include "config.h"
  45 #include "core/rendering/RenderLayerRepainter.h"
  46
  47 #include "core/rendering/CompositedLayerMapping.h"
  48 #include "core/rendering/FilterEffectRenderer.h"
  49 #include "core/rendering/RenderLayer.h"
  50 #include "core/rendering/RenderView.h"
  51
  52 namespace WebCore {
  53
  54 RenderLayerRepainter::RenderLayerRepainter(RenderLayerModelObject* renderer)
  55     : m_renderer(renderer)
  56     , m_repaintStatus(NeedsNormalRepaint)
  57 {
  58 }
  59
  60 void RenderLayerRepainter::repaintAfterLayout(RenderGeometryMap* geometryMap, bool shouldCheckForRepaint)
  61 {
  62     // FIXME: really, we're in the repaint phase here, and the following queries are legal.
  63     // Until those states are fully fledged, I'll just disable the ASSERTS.
  64     DisableCompositingQueryAsserts disabler;
  65     if (m_renderer->layer()->hasVisibleContent()) {
  66         RenderView* view = m_renderer->view();
  67         ASSERT(view);
  68         // FIXME: LayoutState does not work with RenderLayers as there is not a 1-to-1
  69         // mapping between them and the RenderObjects. It would be neat to enable
  70         // LayoutState outside the layout() phase and use it here.
  71         ASSERT(!view->layoutStateEnabled());
  72
  73         RenderLayerModelObject* repaintContainer = m_renderer->containerForRepaint();
  74         LayoutRect oldRepaintRect = m_repaintRect;
  75         LayoutRect oldOutlineBox = m_outlineBox;
  76         computeRepaintRects(repaintContainer, geometryMap);
  77
  78         // FIXME: Should ASSERT that value calculated for m_outlineBox using the cached offset is the same
  79         // as the value not using the cached offset, but we can't due to https://bugs.webkit.org/show_bug.cgi?id=37048
  80         if (shouldCheckForRepaint) {
  81             if (view && !view->document().printing()) {
  82                 if (m_repaintStatus & NeedsFullRepaint) {
  83                     m_renderer->repaintUsingContainer(repaintContainer, pixelSnappedIntRect(oldRepaintRect));
  84                     if (m_repaintRect != oldRepaintRect)
  85                         m_renderer->repaintUsingContainer(repaintContainer, pixelSnappedIntRect(m_repaintRect));
  86                 } else if (shouldRepaintAfterLayout()) {
  87                     m_renderer->repaintAfterLayoutIfNeeded(repaintContainer, m_renderer->selfNeedsLayout(), oldRepaintRect, oldOutlineBox, &m_repaintRect, &m_outlineBox);
  88                 }
  89             }
  90         }
  91     } else {
  92         clearRepaintRects();
  93     }
  94
  95     m_repaintStatus = NeedsNormalRepaint;
  96
  97 }
  98
  99 void RenderLayerRepainter::clearRepaintRects()
 100 {
 101     ASSERT(!m_renderer->layer()->hasVisibleContent());
 102
 103     m_repaintRect = IntRect();
 104     m_outlineBox = IntRect();
 105 }
 106
 107 void RenderLayerRepainter::computeRepaintRects(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap)
 108 {
 109     m_repaintRect = m_renderer->clippedOverflowRectForRepaint(repaintContainer);
 110     m_outlineBox = m_renderer->outlineBoundsForRepaint(repaintContainer, geometryMap);
 111 }
 112
 113 void RenderLayerRepainter::computeRepaintRectsIncludingDescendants()
 114 {
 115     // FIXME: computeRepaintRects() has to walk up the parent chain for every layer to compute the rects.
 116     // We should make this more efficient.
 117     // FIXME: it's wrong to call this when layout is not up-to-date, which we do.
 118     computeRepaintRects(m_renderer->containerForRepaint());
 119
 120     for (RenderLayer* layer = m_renderer->layer()->firstChild(); layer; layer = layer->nextSibling())
 121         layer->repainter().computeRepaintRectsIncludingDescendants();
 122 }
 123
 124 inline bool RenderLayerRepainter::shouldRepaintAfterLayout() const
 125 {
 126     if (m_repaintStatus == NeedsNormalRepaint)
 127         return true;
 128
 129     // Composited layers that were moved during a positioned movement only
 130     // layout, don't need to be repainted. They just need to be recomposited.
 131     ASSERT(m_repaintStatus == NeedsFullRepaintForPositionedMovementLayout);
 132     return m_renderer->compositingState() != PaintsIntoOwnBacking;
 133 }
 134
 135 // Since we're only painting non-composited layers, we know that they all share the same repaintContainer.
 136 void RenderLayerRepainter::repaintIncludingNonCompositingDescendants(RenderLayerModelObject* repaintContainer)
 137 {
 138     m_renderer->repaintUsingContainer(repaintContainer, pixelSnappedIntRect(m_renderer->clippedOverflowRectForRepaint(repaintContainer)));
 139
 140     for (RenderLayer* curr = m_renderer->layer()->firstChild(); curr; curr = curr->nextSibling()) {
 141         if (!curr->hasCompositedLayerMapping())
 142             curr->repainter().repaintIncludingNonCompositingDescendants(repaintContainer);
 143     }
 144 }
 145
 146 LayoutRect RenderLayerRepainter::repaintRectIncludingNonCompositingDescendants() const
 147 {
 148     LayoutRect repaintRect = m_repaintRect;
 149     for (RenderLayer* child = m_renderer->layer()->firstChild(); child; child = child->nextSibling()) {
 150         // Don't include repaint rects for composited child layers; they will paint themselves and have a different origin.
 151         if (child->hasCompositedLayerMapping())
 152             continue;
 153
 154         repaintRect.unite(child->repainter().repaintRectIncludingNonCompositingDescendants());
 155     }
 156     return repaintRect;
 157 }
 158
 159 void RenderLayerRepainter::setBackingNeedsRepaint()
 160 {
 161     ASSERT(m_renderer->compositingState() != NotComposited);
 162
 163     if (m_renderer->compositingState() == PaintsIntoGroupedBacking) {
 164         // FIXME: should probably setNeedsDisplayInRect for this layer's bounds only.
 165         m_renderer->groupedMapping()->squashingLayer()->setNeedsDisplay();
 166     } else {
 167         m_renderer->compositedLayerMapping()->setContentsNeedDisplay();
 168     }
 169 }
 170
 171 void RenderLayerRepainter::setBackingNeedsRepaintInRect(const LayoutRect& r)
 172 {
 173     // https://bugs.webkit.org/show_bug.cgi?id=61159 describes an unreproducible crash here,
 174     // so assert but check that the layer is composited.
 175     ASSERT(m_renderer->compositingState() != NotComposited);
 176     if (m_renderer->compositingState() == NotComposited) {
 177         // If we're trying to repaint the placeholder document layer, propagate the
 178         // repaint to the native view system.
 179         LayoutRect absRect(r);
 180         LayoutPoint delta;
 181         m_renderer->layer()->convertToLayerCoords(m_renderer->layer()->root(), delta);
 182         absRect.moveBy(delta);
 183
 184         RenderView* view = m_renderer->view();
 185         if (view)
 186             view->repaintViewRectangle(absRect);
 187     } else {
 188         if (m_renderer->compositingState() == PaintsIntoGroupedBacking) {
 189             // FIXME: LayoutRect rounding to IntRect is probably not a good idea.
 190             IntRect offsetRect = pixelSnappedIntRect(r);
 191             if (m_renderer->hasTransform())
 192                 offsetRect = m_renderer->layer()->transform()->mapRect(pixelSnappedIntRect(r));
 193
 194             offsetRect.move(-m_renderer->layer()->offsetFromSquashingLayerOrigin());
 195             m_renderer->groupedMapping()->squashingLayer()->setNeedsDisplayInRect(offsetRect);
 196         } else {
 197             IntRect repaintRect = pixelSnappedIntRect(r.location() +  m_renderer->compositedLayerMapping()->subpixelAccumulation(), r.size());
 198             m_renderer->compositedLayerMapping()->setContentsNeedDisplayInRect(repaintRect);
 199         }
 200     }
 201 }
 202
 203 void RenderLayerRepainter::repaintIncludingDescendants()
 204 {
 205     m_renderer->repaint();
 206     for (RenderLayer* curr = m_renderer->layer()->firstChild(); curr; curr = curr->nextSibling())
 207         curr->repainter().repaintIncludingDescendants();
 208 }
 209
 210 void RenderLayerRepainter::setFilterBackendNeedsRepaintingInRect(const LayoutRect& rect)
 211 {
 212     if (rect.isEmpty())
 213         return;
 214
 215     LayoutRect rectForRepaint = rect;
 216     m_renderer->style()->filterOutsets().expandRect(rectForRepaint);
 217
 218     RenderLayerFilterInfo* filterInfo = m_renderer->layer()->filterInfo();
 219     ASSERT(filterInfo);
 220     filterInfo->expandDirtySourceRect(rectForRepaint);
 221
 222     ASSERT(filterInfo->renderer());
 223     if (filterInfo->renderer()->hasCustomShaderFilter()) {
 224         // If we have at least one custom shader, we need to update the whole bounding box of the layer, because the
 225         // shader can address any ouput pixel.
 226         // Note: This is only for output rect, so there's no need to expand the dirty source rect.
 227         rectForRepaint.unite(m_renderer->layer()->calculateLayerBounds(m_renderer->layer()));
 228     }
 229
 230     RenderLayer* parentLayer = enclosingFilterRepaintLayer();
 231     ASSERT(parentLayer);
 232     FloatQuad repaintQuad(rectForRepaint);
 233     LayoutRect parentLayerRect = m_renderer->localToContainerQuad(repaintQuad, parentLayer->renderer()).enclosingBoundingBox();
 234
 235     if (parentLayer->hasCompositedLayerMapping()) {
 236         parentLayer->repainter().setBackingNeedsRepaintInRect(parentLayerRect);
 237         return;
 238     }
 239
 240     if (parentLayer->paintsWithFilters()) {
 241         parentLayer->repainter().setFilterBackendNeedsRepaintingInRect(parentLayerRect);
 242         return;
 243     }
 244
 245     if (parentLayer->isRootLayer()) {
 246         RenderView* view = toRenderView(parentLayer->renderer());
 247         view->repaintViewRectangle(parentLayerRect);
 248         return;
 249     }
 250
 251     ASSERT_NOT_REACHED();
 252 }
 253
 254 RenderLayer* RenderLayerRepainter::enclosingFilterRepaintLayer() const
 255 {
 256     for (const RenderLayer* curr = m_renderer->layer(); curr; curr = curr->parent()) {
 257         if ((curr != m_renderer->layer() && curr->requiresFullLayerImageForFilters()) || curr->compositingState() == PaintsIntoOwnBacking || curr->isRootLayer())
 258             return const_cast<RenderLayer*>(curr);
 259     }
 260     return 0;
 261 }
 262
 263 } // Namespace WebCore