1 /*
2 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
4 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Google, Inc.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #include "config.h"
24
25 #if ENABLE(SVG)
26 #include "RenderSVGRoot.h"
27
28 #include "GraphicsContext.h"
29 #include "HitTestResult.h"
30 #include "RenderSVGContainer.h"
31 #include "RenderSVGResource.h"
32 #include "RenderView.h"
33 #include "SVGLength.h"
34 #include "SVGRenderSupport.h"
35 #include "SVGResources.h"
36 #include "SVGSVGElement.h"
37 #include "SVGStyledElement.h"
38 #include "TransformState.h"
39
40 #if ENABLE(FILTERS)
41 #include "RenderSVGResourceFilter.h"
42 #endif
43
44 using namespace std;
45
46 namespace WebCore {
47
RenderSVGRoot(SVGStyledElement * node)48 RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node)
49 : RenderBox(node)
50 , m_isLayoutSizeChanged(false)
51 , m_needsBoundariesOrTransformUpdate(true)
52 {
53 setReplaced(true);
54 }
55
~RenderSVGRoot()56 RenderSVGRoot::~RenderSVGRoot()
57 {
58 }
59
computePreferredLogicalWidths()60 void RenderSVGRoot::computePreferredLogicalWidths()
61 {
62 ASSERT(preferredLogicalWidthsDirty());
63
64 int borderAndPadding = borderAndPaddingWidth();
65 int width = computeReplacedLogicalWidth(false) + borderAndPadding;
66
67 if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)
68 width = min(width, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? borderAndPadding : 0));
69
70 if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent())) {
71 m_minPreferredLogicalWidth = 0;
72 m_maxPreferredLogicalWidth = width;
73 } else
74 m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = width;
75
76 setPreferredLogicalWidthsDirty(false);
77 }
78
computeReplacedLogicalWidth(bool includeMaxWidth) const79 int RenderSVGRoot::computeReplacedLogicalWidth(bool includeMaxWidth) const
80 {
81 int replacedWidth = RenderBox::computeReplacedLogicalWidth(includeMaxWidth);
82 if (!style()->logicalWidth().isPercent())
83 return replacedWidth;
84
85 // FIXME: Investigate in size rounding issues
86 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
87 return static_cast<int>(roundf(replacedWidth * svg->currentScale()));
88 }
89
computeReplacedLogicalHeight() const90 int RenderSVGRoot::computeReplacedLogicalHeight() const
91 {
92 int replacedHeight = RenderBox::computeReplacedLogicalHeight();
93 if (!style()->logicalHeight().isPercent())
94 return replacedHeight;
95
96 // FIXME: Investigate in size rounding issues
97 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
98 return static_cast<int>(roundf(replacedHeight * svg->currentScale()));
99 }
100
layout()101 void RenderSVGRoot::layout()
102 {
103 ASSERT(needsLayout());
104
105 // Arbitrary affine transforms are incompatible with LayoutState.
106 view()->disableLayoutState();
107
108 bool needsLayout = selfNeedsLayout();
109 LayoutRepainter repainter(*this, checkForRepaintDuringLayout() && needsLayout);
110
111 IntSize oldSize(width(), height());
112 computeLogicalWidth();
113 computeLogicalHeight();
114 calcViewport();
115
116 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
117 m_isLayoutSizeChanged = svg->hasRelativeLengths() && oldSize != size();
118
119 SVGRenderSupport::layoutChildren(this, needsLayout);
120 m_isLayoutSizeChanged = false;
121
122 // At this point LayoutRepainter already grabbed the old bounds,
123 // recalculate them now so repaintAfterLayout() uses the new bounds.
124 if (m_needsBoundariesOrTransformUpdate) {
125 updateCachedBoundaries();
126 m_needsBoundariesOrTransformUpdate = false;
127 }
128
129 repainter.repaintAfterLayout();
130
131 view()->enableLayoutState();
132 setNeedsLayout(false);
133 }
134
selfWillPaint()135 bool RenderSVGRoot::selfWillPaint()
136 {
137 #if ENABLE(FILTERS)
138 SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
139 return resources && resources->filter();
140 #else
141 return false;
142 #endif
143 }
144
paint(PaintInfo & paintInfo,int parentX,int parentY)145 void RenderSVGRoot::paint(PaintInfo& paintInfo, int parentX, int parentY)
146 {
147 if (paintInfo.context->paintingDisabled())
148 return;
149
150 bool isVisible = style()->visibility() == VISIBLE;
151 IntPoint parentOriginInContainer(parentX, parentY);
152 IntPoint borderBoxOriginInContainer = parentOriginInContainer + parentOriginToBorderBox();
153
154 if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseChildBlockBackground) && isVisible)
155 paintBoxDecorations(paintInfo, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y());
156
157 if (paintInfo.phase == PaintPhaseBlockBackground)
158 return;
159
160 // An empty viewport disables rendering. FIXME: Should we still render filters?
161 if (m_viewportSize.isEmpty())
162 return;
163
164 // Don't paint if we don't have kids, except if we have filters we should paint those.
165 if (!firstChild() && !selfWillPaint())
166 return;
167
168 // Make a copy of the PaintInfo because applyTransform will modify the damage rect.
169 PaintInfo childPaintInfo(paintInfo);
170 childPaintInfo.context->save();
171
172 // Apply initial viewport clip - not affected by overflow handling
173 childPaintInfo.context->clip(overflowClipRect(borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y()));
174
175 // Convert from container offsets (html renderers) to a relative transform (svg renderers).
176 // Transform from our paint container's coordinate system to our local coords.
177 childPaintInfo.applyTransform(localToRepaintContainerTransform(parentOriginInContainer));
178
179 bool continueRendering = true;
180 if (childPaintInfo.phase == PaintPhaseForeground)
181 continueRendering = SVGRenderSupport::prepareToRenderSVGContent(this, childPaintInfo);
182
183 if (continueRendering)
184 RenderBox::paint(childPaintInfo, 0, 0);
185
186 if (childPaintInfo.phase == PaintPhaseForeground)
187 SVGRenderSupport::finishRenderSVGContent(this, childPaintInfo, paintInfo.context);
188
189 childPaintInfo.context->restore();
190
191 if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && isVisible)
192 paintOutline(paintInfo.context, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y(), width(), height());
193 }
194
destroy()195 void RenderSVGRoot::destroy()
196 {
197 SVGResourcesCache::clientDestroyed(this);
198 RenderBox::destroy();
199 }
200
styleWillChange(StyleDifference diff,const RenderStyle * newStyle)201 void RenderSVGRoot::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
202 {
203 if (diff == StyleDifferenceLayout)
204 setNeedsBoundariesUpdate();
205 RenderBox::styleWillChange(diff, newStyle);
206 }
207
styleDidChange(StyleDifference diff,const RenderStyle * oldStyle)208 void RenderSVGRoot::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
209 {
210 RenderBox::styleDidChange(diff, oldStyle);
211 SVGResourcesCache::clientStyleChanged(this, diff, style());
212 }
213
updateFromElement()214 void RenderSVGRoot::updateFromElement()
215 {
216 RenderBox::updateFromElement();
217 SVGResourcesCache::clientUpdatedFromElement(this, style());
218 }
219
calcViewport()220 void RenderSVGRoot::calcViewport()
221 {
222 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
223
224 if (!svg->hasSetContainerSize()) {
225 // In the normal case of <svg> being stand-alone or in a CSSBoxModel object we use
226 // RenderBox::width()/height() (which pulls data from RenderStyle)
227 m_viewportSize = FloatSize(width(), height());
228 return;
229 }
230
231 // In the SVGImage case grab the SVGLength values off of SVGSVGElement and use
232 // the special relativeWidthValue accessors which respect the specified containerSize
233 // FIXME: Check how SVGImage + zooming is supposed to be handled?
234 SVGLength width = svg->width();
235 SVGLength height = svg->height();
236 m_viewportSize = FloatSize(width.unitType() == LengthTypePercentage ? svg->relativeWidthValue() : width.value(svg),
237 height.unitType() == LengthTypePercentage ? svg->relativeHeightValue() : height.value(svg));
238 }
239
240 // RenderBox methods will expect coordinates w/o any transforms in coordinates
241 // relative to our borderBox origin. This method gives us exactly that.
localToBorderBoxTransform() const242 AffineTransform RenderSVGRoot::localToBorderBoxTransform() const
243 {
244 IntSize borderAndPadding = borderOriginToContentBox();
245 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
246 float scale = svg->currentScale();
247 FloatPoint translate = svg->currentTranslate();
248 AffineTransform ctm(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y());
249 return ctm * svg->viewBoxToViewTransform(width() / scale, height() / scale);
250 }
251
parentOriginToBorderBox() const252 IntSize RenderSVGRoot::parentOriginToBorderBox() const
253 {
254 return IntSize(x(), y());
255 }
256
borderOriginToContentBox() const257 IntSize RenderSVGRoot::borderOriginToContentBox() const
258 {
259 return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop());
260 }
261
localToRepaintContainerTransform(const IntPoint & parentOriginInContainer) const262 AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const
263 {
264 return AffineTransform::translation(parentOriginInContainer.x(), parentOriginInContainer.y()) * localToParentTransform();
265 }
266
localToParentTransform() const267 const AffineTransform& RenderSVGRoot::localToParentTransform() const
268 {
269 IntSize parentToBorderBoxOffset = parentOriginToBorderBox();
270
271 m_localToParentTransform = AffineTransform::translation(parentToBorderBoxOffset.width(), parentToBorderBoxOffset.height()) * localToBorderBoxTransform();
272
273 return m_localToParentTransform;
274 }
275
clippedOverflowRectForRepaint(RenderBoxModelObject * repaintContainer)276 IntRect RenderSVGRoot::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)
277 {
278 return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);
279 }
280
computeRectForRepaint(RenderBoxModelObject * repaintContainer,IntRect & repaintRect,bool fixed)281 void RenderSVGRoot::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& repaintRect, bool fixed)
282 {
283 // Apply our local transforms (except for x/y translation), then our shadow,
284 // and then call RenderBox's method to handle all the normal CSS Box model bits
285 repaintRect = localToBorderBoxTransform().mapRect(repaintRect);
286
287 // Apply initial viewport clip - not affected by overflow settings
288 repaintRect.intersect(enclosingIntRect(FloatRect(FloatPoint(), m_viewportSize)));
289
290 const SVGRenderStyle* svgStyle = style()->svgStyle();
291 if (const ShadowData* shadow = svgStyle->shadow())
292 shadow->adjustRectForShadow(repaintRect);
293
294 RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);
295 }
296
mapLocalToContainer(RenderBoxModelObject * repaintContainer,bool fixed,bool useTransforms,TransformState & transformState) const297 void RenderSVGRoot::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed , bool useTransforms, TransformState& transformState) const
298 {
299 ASSERT(!fixed); // We should have no fixed content in the SVG rendering tree.
300 ASSERT(useTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.
301
302 // Transform to our border box and let RenderBox transform the rest of the way.
303 transformState.applyTransform(localToBorderBoxTransform());
304 RenderBox::mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);
305 }
306
updateCachedBoundaries()307 void RenderSVGRoot::updateCachedBoundaries()
308 {
309 m_objectBoundingBox = FloatRect();
310 m_strokeBoundingBox = FloatRect();
311 m_repaintBoundingBox = FloatRect();
312
313 SVGRenderSupport::computeContainerBoundingBoxes(this, m_objectBoundingBox, m_strokeBoundingBox, m_repaintBoundingBox);
314 SVGRenderSupport::intersectRepaintRectWithResources(this, m_repaintBoundingBox);
315 m_repaintBoundingBox.inflate(borderAndPaddingWidth());
316 }
317
nodeAtPoint(const HitTestRequest & request,HitTestResult & result,int x,int y,int tx,int ty,HitTestAction hitTestAction)318 bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)
319 {
320 IntPoint pointInContainer(x, y);
321 IntSize containerToParentOffset(tx, ty);
322
323 IntPoint pointInParent = pointInContainer - containerToParentOffset;
324 IntPoint pointInBorderBox = pointInParent - parentOriginToBorderBox();
325
326 // Note: For now, we're ignoring hits to border and padding for <svg>
327 IntPoint pointInContentBox = pointInBorderBox - borderOriginToContentBox();
328 if (!contentBoxRect().contains(pointInContentBox))
329 return false;
330
331 IntPoint localPoint = localToParentTransform().inverse().mapPoint(pointInParent);
332
333 for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
334 if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
335 // FIXME: CSS/HTML assumes the local point is relative to the border box, right?
336 updateHitTestResult(result, pointInBorderBox);
337 // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
338 result.addNodeToRectBasedTestResult(child->node(), x, y);
339 return true;
340 }
341 }
342
343 // If we didn't early exit above, we've just hit the container <svg> element. Unlike SVG 1.1, 2nd Edition allows container elements to be hit.
344 if (hitTestAction == HitTestBlockBackground) {
345 // Only return true here, if the last hit testing phase 'BlockBackground' is executed. If we'd return true in the 'Foreground' phase,
346 // hit testing would stop immediately. For SVG only trees this doesn't matter. Though when we have a <foreignObject> subtree we need
347 // to be able to detect hits on the background of a <div> element. If we'd return true here in the 'Foreground' phase, we are not able
348 // to detect these hits anymore.
349 updateHitTestResult(result, roundedIntPoint(localPoint));
350 return true;
351 }
352
353 return false;
354 }
355
356 }
357
358 #endif // ENABLE(SVG)
359