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      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 (at) fas.harvard.edu>
      9  *   Christian Biesinger <cbiesinger (at) web.de>
     10  *   Randall Jesup <rjesup (at) wgate.com>
     11  *   Roland Mainz <roland.mainz (at) informatik.med.uni-giessen.de>
     12  *   Josh Soref <timeless (at) mac.com>
     13  *   Boris Zbarsky <bzbarsky (at) 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  *
     25  * You should have received a copy of the GNU Lesser General Public
     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.
     40  * If you do not delete the provisions above, a recipient may use your
     41  * version of this file under any of the LGPL, the MPL or the GPL.
     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     if (m_renderer->layer()->hasVisibleContent()) {
     63         RenderView* view = m_renderer->view();
     64         ASSERT(view);
     65         // FIXME: LayoutState does not work with RenderLayers as there is not a 1-to-1
     66         // mapping between them and the RenderObjects. It would be neat to enable
     67         // LayoutState outside the layout() phase and use it here.
     68         ASSERT(!view->layoutStateEnabled());
     69 
     70         RenderLayerModelObject* repaintContainer = m_renderer->containerForRepaint();
     71         LayoutRect oldRepaintRect = m_repaintRect;
     72         LayoutRect oldOutlineBox = m_outlineBox;
     73         computeRepaintRects(repaintContainer, geometryMap);
     74 
     75         // FIXME: Should ASSERT that value calculated for m_outlineBox using the cached offset is the same
     76         // as the value not using the cached offset, but we can't due to https://bugs.webkit.org/show_bug.cgi?id=37048
     77         if (shouldCheckForRepaint) {
     78             if (view && !view->document().printing()) {
     79                 if (m_repaintStatus & NeedsFullRepaint) {
     80                     m_renderer->repaintUsingContainer(repaintContainer, pixelSnappedIntRect(oldRepaintRect));
     81                     if (m_repaintRect != oldRepaintRect)
     82                         m_renderer->repaintUsingContainer(repaintContainer, pixelSnappedIntRect(m_repaintRect));
     83                 } else if (shouldRepaintAfterLayout()) {
     84                     m_renderer->repaintAfterLayoutIfNeeded(repaintContainer, m_renderer->selfNeedsLayout(), oldRepaintRect, oldOutlineBox, &m_repaintRect, &m_outlineBox);
     85                 }
     86             }
     87         }
     88     } else {
     89         clearRepaintRects();
     90     }
     91 
     92     m_repaintStatus = NeedsNormalRepaint;
     93 
     94 }
     95 
     96 void RenderLayerRepainter::clearRepaintRects()
     97 {
     98     ASSERT(!m_renderer->layer()->hasVisibleContent());
     99 
    100     m_repaintRect = IntRect();
    101     m_outlineBox = IntRect();
    102 }
    103 
    104 void RenderLayerRepainter::computeRepaintRects(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap)
    105 {
    106     m_repaintRect = m_renderer->clippedOverflowRectForRepaint(repaintContainer);
    107     m_outlineBox = m_renderer->outlineBoundsForRepaint(repaintContainer, geometryMap);
    108 }
    109 
    110 void RenderLayerRepainter::computeRepaintRectsIncludingDescendants()
    111 {
    112     // FIXME: computeRepaintRects() has to walk up the parent chain for every layer to compute the rects.
    113     // We should make this more efficient.
    114     // FIXME: it's wrong to call this when layout is not up-to-date, which we do.
    115     computeRepaintRects(m_renderer->containerForRepaint());
    116 
    117     for (RenderLayer* layer = m_renderer->layer()->firstChild(); layer; layer = layer->nextSibling())
    118         layer->repainter().computeRepaintRectsIncludingDescendants();
    119 }
    120 
    121 inline bool RenderLayerRepainter::shouldRepaintAfterLayout() const
    122 {
    123     if (m_repaintStatus == NeedsNormalRepaint)
    124         return true;
    125 
    126     // Composited layers that were moved during a positioned movement only
    127     // layout, don't need to be repainted. They just need to be recomposited.
    128     ASSERT(m_repaintStatus == NeedsFullRepaintForPositionedMovementLayout);
    129     return m_renderer->compositingState() != PaintsIntoOwnBacking;
    130 }
    131 
    132 // Since we're only painting non-composited layers, we know that they all share the same repaintContainer.
    133 void RenderLayerRepainter::repaintIncludingNonCompositingDescendants(RenderLayerModelObject* repaintContainer)
    134 {
    135     m_renderer->repaintUsingContainer(repaintContainer, pixelSnappedIntRect(m_renderer->clippedOverflowRectForRepaint(repaintContainer)));
    136 
    137     for (RenderLayer* curr = m_renderer->layer()->firstChild(); curr; curr = curr->nextSibling()) {
    138         if (!curr->hasCompositedLayerMapping())
    139             curr->repainter().repaintIncludingNonCompositingDescendants(repaintContainer);
    140     }
    141 }
    142 
    143 LayoutRect RenderLayerRepainter::repaintRectIncludingNonCompositingDescendants() const
    144 {
    145     LayoutRect repaintRect = m_repaintRect;
    146     for (RenderLayer* child = m_renderer->layer()->firstChild(); child; child = child->nextSibling()) {
    147         // Don't include repaint rects for composited child layers; they will paint themselves and have a different origin.
    148         if (child->hasCompositedLayerMapping())
    149             continue;
    150 
    151         repaintRect.unite(child->repainter().repaintRectIncludingNonCompositingDescendants());
    152     }
    153     return repaintRect;
    154 }
    155 
    156 void RenderLayerRepainter::setBackingNeedsRepaint()
    157 {
    158     ASSERT(m_renderer->compositingState() != NotComposited);
    159 
    160     if (m_renderer->compositingState() == PaintsIntoGroupedBacking) {
    161         // FIXME: should probably setNeedsDisplayInRect for this layer's bounds only.
    162         m_renderer->groupedMapping()->squashingLayer()->setNeedsDisplay();
    163     } else {
    164         m_renderer->compositedLayerMapping()->setContentsNeedDisplay();
    165     }
    166 }
    167 
    168 void RenderLayerRepainter::setBackingNeedsRepaintInRect(const LayoutRect& r)
    169 {
    170     // https://bugs.webkit.org/show_bug.cgi?id=61159 describes an unreproducible crash here,
    171     // so assert but check that the layer is composited.
    172     ASSERT(m_renderer->compositingState() != NotComposited);
    173     if (m_renderer->compositingState() == NotComposited) {
    174         // If we're trying to repaint the placeholder document layer, propagate the
    175         // repaint to the native view system.
    176         LayoutRect absRect(r);
    177         LayoutPoint delta;
    178         m_renderer->layer()->convertToLayerCoords(m_renderer->layer()->root(), delta);
    179         absRect.moveBy(delta);
    180 
    181         RenderView* view = m_renderer->view();
    182         if (view)
    183             view->repaintViewRectangle(absRect);
    184     } else {
    185         if (m_renderer->compositingState() == PaintsIntoGroupedBacking) {
    186             // FIXME: LayoutRect rounding to IntRect is probably not a good idea.
    187             IntRect offsetRect = pixelSnappedIntRect(r);
    188             if (m_renderer->hasTransform())
    189                 offsetRect = m_renderer->layer()->transform()->mapRect(pixelSnappedIntRect(r));
    190 
    191             offsetRect.move(-m_renderer->layer()->offsetFromSquashingLayerOrigin());
    192             m_renderer->groupedMapping()->squashingLayer()->setNeedsDisplayInRect(offsetRect);
    193         } else {
    194             m_renderer->compositedLayerMapping()->setContentsNeedDisplayInRect(pixelSnappedIntRect(r));
    195         }
    196     }
    197 }
    198 
    199 void RenderLayerRepainter::repaintIncludingDescendants()
    200 {
    201     m_renderer->repaint();
    202     for (RenderLayer* curr = m_renderer->layer()->firstChild(); curr; curr = curr->nextSibling())
    203         curr->repainter().repaintIncludingDescendants();
    204 }
    205 
    206 void RenderLayerRepainter::setFilterBackendNeedsRepaintingInRect(const LayoutRect& rect)
    207 {
    208     if (rect.isEmpty())
    209         return;
    210 
    211     LayoutRect rectForRepaint = rect;
    212     m_renderer->style()->filterOutsets().expandRect(rectForRepaint);
    213 
    214     RenderLayerFilterInfo* filterInfo = m_renderer->layer()->filterInfo();
    215     ASSERT(filterInfo);
    216     filterInfo->expandDirtySourceRect(rectForRepaint);
    217 
    218     ASSERT(filterInfo->renderer());
    219     if (filterInfo->renderer()->hasCustomShaderFilter()) {
    220         // If we have at least one custom shader, we need to update the whole bounding box of the layer, because the
    221         // shader can address any ouput pixel.
    222         // Note: This is only for output rect, so there's no need to expand the dirty source rect.
    223         rectForRepaint.unite(m_renderer->layer()->calculateLayerBounds(m_renderer->layer()));
    224     }
    225 
    226     RenderLayer* parentLayer = enclosingFilterRepaintLayer();
    227     ASSERT(parentLayer);
    228     FloatQuad repaintQuad(rectForRepaint);
    229     LayoutRect parentLayerRect = m_renderer->localToContainerQuad(repaintQuad, parentLayer->renderer()).enclosingBoundingBox();
    230 
    231     if (parentLayer->hasCompositedLayerMapping()) {
    232         parentLayer->repainter().setBackingNeedsRepaintInRect(parentLayerRect);
    233         return;
    234     }
    235 
    236     if (parentLayer->paintsWithFilters()) {
    237         parentLayer->repainter().setFilterBackendNeedsRepaintingInRect(parentLayerRect);
    238         return;
    239     }
    240 
    241     if (parentLayer->isRootLayer()) {
    242         RenderView* view = toRenderView(parentLayer->renderer());
    243         view->repaintViewRectangle(parentLayerRect);
    244         return;
    245     }
    246 
    247     ASSERT_NOT_REACHED();
    248 }
    249 
    250 RenderLayer* RenderLayerRepainter::enclosingFilterRepaintLayer() const
    251 {
    252     for (const RenderLayer* curr = m_renderer->layer(); curr; curr = curr->parent()) {
    253         if ((curr != m_renderer->layer() && curr->requiresFullLayerImageForFilters()) || curr->compositingState() == PaintsIntoOwnBacking || curr->isRootLayer())
    254             return const_cast<RenderLayer*>(curr);
    255     }
    256     return 0;
    257 }
    258 
    259 } // Namespace WebCore
    260