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 *
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
RenderLayerRepainter(RenderLayerModelObject * renderer)54 RenderLayerRepainter::RenderLayerRepainter(RenderLayerModelObject* renderer)
55 : m_renderer(renderer)
56 , m_repaintStatus(NeedsNormalRepaint)
57 {
58 }
59
repaintAfterLayout(RenderGeometryMap * geometryMap,bool shouldCheckForRepaint)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
clearRepaintRects()96 void RenderLayerRepainter::clearRepaintRects()
97 {
98 ASSERT(!m_renderer->layer()->hasVisibleContent());
99
100 m_repaintRect = IntRect();
101 m_outlineBox = IntRect();
102 }
103
computeRepaintRects(const RenderLayerModelObject * repaintContainer,const RenderGeometryMap * geometryMap)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
computeRepaintRectsIncludingDescendants()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
shouldRepaintAfterLayout() const121 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.
repaintIncludingNonCompositingDescendants(RenderLayerModelObject * 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
repaintRectIncludingNonCompositingDescendants() const143 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
setBackingNeedsRepaint()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
setBackingNeedsRepaintInRect(const LayoutRect & r)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
repaintIncludingDescendants()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
setFilterBackendNeedsRepaintingInRect(const LayoutRect & rect)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
enclosingFilterRepaintLayer() const250 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