1 /* 2 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann (at) kde.org> 3 * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis (at) kde.org> 4 * Copyright (C) 2007 Eric Seidel <eric (at) 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 48 RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node) 49 : RenderBox(node) 50 , m_isLayoutSizeChanged(false) 51 , m_needsBoundariesOrTransformUpdate(true) 52 { 53 setReplaced(true); 54 } 55 56 RenderSVGRoot::~RenderSVGRoot() 57 { 58 } 59 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 79 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 90 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 } 100 101 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 } 134 135 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 } 144 145 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 } 194 195 void RenderSVGRoot::destroy() 196 { 197 SVGResourcesCache::clientDestroyed(this); 198 RenderBox::destroy(); 199 } 200 201 void RenderSVGRoot::styleWillChange(StyleDifference diff, const RenderStyle* newStyle) 202 { 203 if (diff == StyleDifferenceLayout) 204 setNeedsBoundariesUpdate(); 205 RenderBox::styleWillChange(diff, newStyle); 206 } 207 208 void RenderSVGRoot::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) 209 { 210 RenderBox::styleDidChange(diff, oldStyle); 211 SVGResourcesCache::clientStyleChanged(this, diff, style()); 212 } 213 214 void RenderSVGRoot::updateFromElement() 215 { 216 RenderBox::updateFromElement(); 217 SVGResourcesCache::clientUpdatedFromElement(this, style()); 218 } 219 220 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. 242 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 } 251 252 IntSize RenderSVGRoot::parentOriginToBorderBox() const 253 { 254 return IntSize(x(), y()); 255 } 256 257 IntSize RenderSVGRoot::borderOriginToContentBox() const 258 { 259 return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop()); 260 } 261 262 AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const 263 { 264 return AffineTransform::translation(parentOriginInContainer.x(), parentOriginInContainer.y()) * localToParentTransform(); 265 } 266 267 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 } 275 276 IntRect RenderSVGRoot::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer) 277 { 278 return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer); 279 } 280 281 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 } 296 297 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 } 306 307 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 } 317 318 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
