1 /*
2 Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
4 2007 Eric Seidel <eric@webkit.org>
5 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 aint 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 "RenderSVGContainer.h"
30 #include "RenderView.h"
31 #include "SVGLength.h"
32 #include "SVGRenderSupport.h"
33 #include "SVGSVGElement.h"
34 #include "SVGStyledElement.h"
35 #include "TransformState.h"
36
37 #if ENABLE(FILTERS)
38 #include "SVGResourceFilter.h"
39 #endif
40
41 using namespace std;
42
43 namespace WebCore {
44
RenderSVGRoot(SVGStyledElement * node)45 RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node)
46 : RenderBox(node)
47 {
48 setReplaced(true);
49 }
50
lineHeight(bool,bool) const51 int RenderSVGRoot::lineHeight(bool, bool) const
52 {
53 return height() + marginTop() + marginBottom();
54 }
55
baselinePosition(bool,bool) const56 int RenderSVGRoot::baselinePosition(bool, bool) const
57 {
58 return height() + marginTop() + marginBottom();
59 }
60
calcPrefWidths()61 void RenderSVGRoot::calcPrefWidths()
62 {
63 ASSERT(prefWidthsDirty());
64
65 int paddingAndBorders = paddingLeft() + paddingRight() + borderLeft() + borderRight();
66 int width = calcReplacedWidth(false) + paddingAndBorders;
67
68 if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)
69 width = min(width, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? paddingAndBorders : 0));
70
71 if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent())) {
72 m_minPrefWidth = 0;
73 m_maxPrefWidth = width;
74 } else
75 m_minPrefWidth = m_maxPrefWidth = width;
76
77 setPrefWidthsDirty(false);
78 }
79
layout()80 void RenderSVGRoot::layout()
81 {
82 ASSERT(needsLayout());
83
84 // Arbitrary affine transforms are incompatible with LayoutState.
85 view()->disableLayoutState();
86
87 LayoutRepainter repainter(*this, checkForRepaintDuringLayout() && selfNeedsLayout());
88
89 int oldWidth = width();
90 calcWidth();
91
92 int oldHeight = height();
93 calcHeight();
94
95 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
96 setWidth(static_cast<int>(width() * svg->currentScale()));
97 setHeight(static_cast<int>(height() * svg->currentScale()));
98 calcViewport();
99
100 // RenderSVGRoot needs to take special care to propagate window size changes to the children,
101 // if the outermost <svg> is using relative x/y/width/height values. Hence the additonal parameters.
102 layoutChildren(this, selfNeedsLayout() || (svg->hasRelativeValues() && (width() != oldWidth || height() != oldHeight)));
103 repainter.repaintAfterLayout();
104
105 view()->enableLayoutState();
106 setNeedsLayout(false);
107 }
108
selfWillPaint() const109 bool RenderSVGRoot::selfWillPaint() const
110 {
111 #if ENABLE(FILTERS)
112 const SVGRenderStyle* svgStyle = style()->svgStyle();
113 SVGResourceFilter* filter = getFilterById(document(), svgStyle->filter(), this);
114 if (filter)
115 return true;
116 #endif
117 return false;
118 }
119
paint(PaintInfo & paintInfo,int parentX,int parentY)120 void RenderSVGRoot::paint(PaintInfo& paintInfo, int parentX, int parentY)
121 {
122 if (paintInfo.context->paintingDisabled())
123 return;
124
125 IntPoint parentOriginInContainer(parentX, parentY);
126 IntPoint borderBoxOriginInContainer = parentOriginInContainer + IntSize(x(), y());
127
128 if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection))
129 paintBoxDecorations(paintInfo, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y());
130
131 // An empty viewport disables rendering. FIXME: Should we still render filters?
132 if (m_viewportSize.isEmpty())
133 return;
134
135 // Don't paint if we don't have kids, except if we have filters we should paint those.
136 if (!firstChild() && !selfWillPaint())
137 return;
138
139 // Make a copy of the PaintInfo because applyTransformToPaintInfo will modify the damage rect.
140 RenderObject::PaintInfo childPaintInfo(paintInfo);
141 childPaintInfo.context->save();
142
143 // Apply initial viewport clip - not affected by overflow handling
144 childPaintInfo.context->clip(overflowClipRect(borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y()));
145
146 // Convert from container offsets (html renderers) to a relative transform (svg renderers).
147 // Transform from our paint container's coordinate system to our local coords.
148 applyTransformToPaintInfo(childPaintInfo, localToRepaintContainerTransform(parentOriginInContainer));
149
150 SVGResourceFilter* filter = 0;
151 FloatRect boundingBox = repaintRectInLocalCoordinates();
152
153 bool continueRendering = true;
154 if (childPaintInfo.phase == PaintPhaseForeground)
155 continueRendering = prepareToRenderSVGContent(this, childPaintInfo, boundingBox, filter);
156
157 if (continueRendering)
158 RenderBox::paint(childPaintInfo, 0, 0);
159
160 if (childPaintInfo.phase == PaintPhaseForeground)
161 finishRenderSVGContent(this, childPaintInfo, filter, paintInfo.context);
162
163 childPaintInfo.context->restore();
164
165 if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && style()->visibility() == VISIBLE)
166 paintOutline(paintInfo.context, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y(), width(), height(), style());
167 }
168
calcViewport()169 void RenderSVGRoot::calcViewport()
170 {
171 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
172
173 if (!selfNeedsLayout() && !svg->hasRelativeValues())
174 return;
175
176 if (!svg->hasSetContainerSize()) {
177 // In the normal case of <svg> being stand-alone or in a CSSBoxModel object we use
178 // RenderBox::width()/height() (which pulls data from RenderStyle)
179 m_viewportSize = FloatSize(width(), height());
180 } else {
181 // In the SVGImage case grab the SVGLength values off of SVGSVGElement and use
182 // the special relativeWidthValue accessors which respect the specified containerSize
183 SVGLength width = svg->width();
184 SVGLength height = svg->height();
185 float viewportWidth = (width.unitType() == LengthTypePercentage) ? svg->relativeWidthValue() : width.value(svg);
186 float viewportHeight = (height.unitType() == LengthTypePercentage) ? svg->relativeHeightValue() : height.value(svg);
187 m_viewportSize = FloatSize(viewportWidth, viewportHeight);
188 }
189 }
190
191 // RenderBox methods will expect coordinates w/o any transforms in coordinates
192 // relative to our borderBox origin. This method gives us exactly that.
localToBorderBoxTransform() const193 AffineTransform RenderSVGRoot::localToBorderBoxTransform() const
194 {
195 IntSize borderAndPadding = borderOriginToContentBox();
196 SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
197 float scale = svg->currentScale();
198 AffineTransform ctm(scale, 0, 0, scale, borderAndPadding.width(), borderAndPadding.height());
199 ctm.translate(svg->currentTranslate().x(), svg->currentTranslate().y());
200 return svg->viewBoxToViewTransform(width(), height()) * ctm;
201 }
202
parentOriginToBorderBox() const203 IntSize RenderSVGRoot::parentOriginToBorderBox() const
204 {
205 return IntSize(x(), y());
206 }
207
borderOriginToContentBox() const208 IntSize RenderSVGRoot::borderOriginToContentBox() const
209 {
210 return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop());
211 }
212
localToRepaintContainerTransform(const IntPoint & parentOriginInContainer) const213 AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const
214 {
215 AffineTransform parentToContainer(localToParentTransform());
216 return parentToContainer.translateRight(parentOriginInContainer.x(), parentOriginInContainer.y());
217 }
218
localToParentTransform() const219 const AffineTransform& RenderSVGRoot::localToParentTransform() const
220 {
221 IntSize parentToBorderBoxOffset = parentOriginToBorderBox();
222
223 AffineTransform borderBoxOriginToParentOrigin(localToBorderBoxTransform());
224 borderBoxOriginToParentOrigin.translateRight(parentToBorderBoxOffset.width(), parentToBorderBoxOffset.height());
225
226 m_localToParentTransform = borderBoxOriginToParentOrigin;
227 return m_localToParentTransform;
228 }
229
objectBoundingBox() const230 FloatRect RenderSVGRoot::objectBoundingBox() const
231 {
232 return computeContainerBoundingBox(this, false);
233 }
234
repaintRectInLocalCoordinates() const235 FloatRect RenderSVGRoot::repaintRectInLocalCoordinates() const
236 {
237 // FIXME: This does not include the border but it should!
238 FloatRect repaintRect = computeContainerBoundingBox(this, true);
239 style()->svgStyle()->inflateForShadow(repaintRect);
240 return repaintRect;
241 }
242
localTransform() const243 AffineTransform RenderSVGRoot::localTransform() const
244 {
245 return AffineTransform();
246 }
247
computeRectForRepaint(RenderBoxModelObject * repaintContainer,IntRect & repaintRect,bool fixed)248 void RenderSVGRoot::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& repaintRect, bool fixed)
249 {
250 // Apply our local transforms (except for x/y translation), then our shadow,
251 // and then call RenderBox's method to handle all the normal CSS Box model bits
252 repaintRect = localToBorderBoxTransform().mapRect(repaintRect);
253
254 // Apply initial viewport clip - not affected by overflow settings
255 repaintRect.intersect(enclosingIntRect(FloatRect(FloatPoint(), m_viewportSize)));
256
257 style()->svgStyle()->inflateForShadow(repaintRect);
258 RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);
259 }
260
mapLocalToContainer(RenderBoxModelObject * repaintContainer,bool fixed,bool useTransforms,TransformState & transformState) const261 void RenderSVGRoot::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed , bool useTransforms, TransformState& transformState) const
262 {
263 ASSERT(!fixed); // We should have no fixed content in the SVG rendering tree.
264 ASSERT(useTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.
265
266 // Transform to our border box and let RenderBox transform the rest of the way.
267 transformState.applyTransform(localToBorderBoxTransform());
268 RenderBox::mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);
269 }
270
nodeAtPoint(const HitTestRequest & request,HitTestResult & result,int _x,int _y,int _tx,int _ty,HitTestAction hitTestAction)271 bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction)
272 {
273 IntPoint pointInContainer(_x, _y);
274 IntSize containerToParentOffset(_tx, _ty);
275
276 IntPoint pointInParent = pointInContainer - containerToParentOffset;
277 IntPoint pointInBorderBox = pointInParent - parentOriginToBorderBox();
278
279 // Note: For now, we're ignoring hits to border and padding for <svg>
280 IntPoint pointInContentBox = pointInBorderBox - borderOriginToContentBox();
281 if (!contentBoxRect().contains(pointInContentBox))
282 return false;
283
284 IntPoint localPoint = localToParentTransform().inverse().mapPoint(pointInParent);
285
286 for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
287 if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
288 // FIXME: CSS/HTML assumes the local point is relative to the border box, right?
289 updateHitTestResult(result, pointInBorderBox);
290 return true;
291 }
292 }
293
294 // Spec: Only graphical elements can be targeted by the mouse, so we don't check self here.
295 // 16.4: "If there are no graphics elements whose relevant graphics content is under the pointer (i.e., there is no target element), the event is not dispatched."
296 return false;
297 }
298
299 }
300
301 #endif // ENABLE(SVG)
302