1 /* 2 Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann (at) kde.org> 3 2004, 2005, 2006, 2007 Rob Buis <buis (at) kde.org> 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Library General Public 7 License as published by the Free Software Foundation; either 8 version 2 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Library General Public License for more details. 14 15 You should have received a copy of the GNU Library General Public License 16 along with this library; see the file COPYING.LIB. If not, write to 17 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 Boston, MA 02110-1301, USA. 19 */ 20 21 #include "config.h" 22 23 #if ENABLE(SVG) 24 #include "SVGPatternElement.h" 25 26 #include "AffineTransform.h" 27 #include "Document.h" 28 #include "FloatConversion.h" 29 #include "GraphicsContext.h" 30 #include "ImageBuffer.h" 31 #include "MappedAttribute.h" 32 #include "PatternAttributes.h" 33 #include "RenderSVGContainer.h" 34 #include "SVGLength.h" 35 #include "SVGNames.h" 36 #include "SVGPaintServerPattern.h" 37 #include "SVGRenderSupport.h" 38 #include "SVGSVGElement.h" 39 #include "SVGStyledTransformableElement.h" 40 #include "SVGTransformList.h" 41 #include "SVGTransformable.h" 42 #include "SVGUnitTypes.h" 43 #include <math.h> 44 #include <wtf/MathExtras.h> 45 #include <wtf/OwnPtr.h> 46 47 using namespace std; 48 49 namespace WebCore { 50 51 SVGPatternElement::SVGPatternElement(const QualifiedName& tagName, Document* doc) 52 : SVGStyledElement(tagName, doc) 53 , SVGURIReference() 54 , SVGTests() 55 , SVGLangSpace() 56 , SVGExternalResourcesRequired() 57 , SVGFitToViewBox() 58 , m_x(LengthModeWidth) 59 , m_y(LengthModeHeight) 60 , m_width(LengthModeWidth) 61 , m_height(LengthModeHeight) 62 , m_patternUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) 63 , m_patternContentUnits(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE) 64 , m_patternTransform(SVGTransformList::create(SVGNames::patternTransformAttr)) 65 { 66 } 67 68 SVGPatternElement::~SVGPatternElement() 69 { 70 } 71 72 void SVGPatternElement::parseMappedAttribute(MappedAttribute* attr) 73 { 74 if (attr->name() == SVGNames::patternUnitsAttr) { 75 if (attr->value() == "userSpaceOnUse") 76 setPatternUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE); 77 else if (attr->value() == "objectBoundingBox") 78 setPatternUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX); 79 } else if (attr->name() == SVGNames::patternContentUnitsAttr) { 80 if (attr->value() == "userSpaceOnUse") 81 setPatternContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE); 82 else if (attr->value() == "objectBoundingBox") 83 setPatternContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX); 84 } else if (attr->name() == SVGNames::patternTransformAttr) { 85 SVGTransformList* patternTransforms = patternTransformBaseValue(); 86 if (!SVGTransformable::parseTransformAttribute(patternTransforms, attr->value())) { 87 ExceptionCode ec = 0; 88 patternTransforms->clear(ec); 89 } 90 } else if (attr->name() == SVGNames::xAttr) 91 setXBaseValue(SVGLength(LengthModeWidth, attr->value())); 92 else if (attr->name() == SVGNames::yAttr) 93 setYBaseValue(SVGLength(LengthModeHeight, attr->value())); 94 else if (attr->name() == SVGNames::widthAttr) { 95 setWidthBaseValue(SVGLength(LengthModeWidth, attr->value())); 96 if (widthBaseValue().value(this) < 0.0) 97 document()->accessSVGExtensions()->reportError("A negative value for pattern attribute <width> is not allowed"); 98 } else if (attr->name() == SVGNames::heightAttr) { 99 setHeightBaseValue(SVGLength(LengthModeHeight, attr->value())); 100 if (heightBaseValue().value(this) < 0.0) 101 document()->accessSVGExtensions()->reportError("A negative value for pattern attribute <height> is not allowed"); 102 } else { 103 if (SVGURIReference::parseMappedAttribute(attr)) 104 return; 105 if (SVGTests::parseMappedAttribute(attr)) 106 return; 107 if (SVGLangSpace::parseMappedAttribute(attr)) 108 return; 109 if (SVGExternalResourcesRequired::parseMappedAttribute(attr)) 110 return; 111 if (SVGFitToViewBox::parseMappedAttribute(document(), attr)) 112 return; 113 114 SVGStyledElement::parseMappedAttribute(attr); 115 } 116 } 117 118 void SVGPatternElement::svgAttributeChanged(const QualifiedName& attrName) 119 { 120 SVGStyledElement::svgAttributeChanged(attrName); 121 122 if (!m_resource) 123 return; 124 125 if (attrName == SVGNames::patternUnitsAttr || attrName == SVGNames::patternContentUnitsAttr || 126 attrName == SVGNames::patternTransformAttr || attrName == SVGNames::xAttr || attrName == SVGNames::yAttr || 127 attrName == SVGNames::widthAttr || attrName == SVGNames::heightAttr || 128 SVGURIReference::isKnownAttribute(attrName) || 129 SVGTests::isKnownAttribute(attrName) || 130 SVGLangSpace::isKnownAttribute(attrName) || 131 SVGExternalResourcesRequired::isKnownAttribute(attrName) || 132 SVGFitToViewBox::isKnownAttribute(attrName) || 133 SVGStyledElement::isKnownAttribute(attrName)) 134 m_resource->invalidate(); 135 } 136 137 void SVGPatternElement::synchronizeProperty(const QualifiedName& attrName) 138 { 139 SVGStyledElement::synchronizeProperty(attrName); 140 141 if (attrName == anyQName()) { 142 synchronizePatternUnits(); 143 synchronizePatternContentUnits(); 144 synchronizePatternTransform(); 145 synchronizeX(); 146 synchronizeY(); 147 synchronizeWidth(); 148 synchronizeHeight(); 149 synchronizeExternalResourcesRequired(); 150 synchronizeViewBox(); 151 synchronizePreserveAspectRatio(); 152 synchronizeHref(); 153 return; 154 } 155 156 if (attrName == SVGNames::patternUnitsAttr) 157 synchronizePatternUnits(); 158 else if (attrName == SVGNames::patternContentUnitsAttr) 159 synchronizePatternContentUnits(); 160 else if (attrName == SVGNames::patternTransformAttr) 161 synchronizePatternTransform(); 162 else if (attrName == SVGNames::xAttr) 163 synchronizeX(); 164 else if (attrName == SVGNames::yAttr) 165 synchronizeY(); 166 else if (attrName == SVGNames::widthAttr) 167 synchronizeWidth(); 168 else if (attrName == SVGNames::heightAttr) 169 synchronizeHeight(); 170 else if (SVGExternalResourcesRequired::isKnownAttribute(attrName)) 171 synchronizeExternalResourcesRequired(); 172 else if (SVGFitToViewBox::isKnownAttribute(attrName)) { 173 synchronizeViewBox(); 174 synchronizePreserveAspectRatio(); 175 } else if (SVGURIReference::isKnownAttribute(attrName)) 176 synchronizeHref(); 177 } 178 179 void SVGPatternElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta) 180 { 181 SVGStyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta); 182 183 if (!m_resource) 184 return; 185 186 m_resource->invalidate(); 187 } 188 189 void SVGPatternElement::buildPattern(const FloatRect& targetRect) const 190 { 191 PatternAttributes attributes = collectPatternProperties(); 192 193 // If we didn't find any pattern content, ignore the request. 194 if (!attributes.patternContentElement() || !renderer() || !renderer()->style()) 195 return; 196 197 FloatRect patternBoundaries; 198 FloatRect patternContentBoundaries; 199 200 // Determine specified pattern size 201 if (attributes.boundingBoxMode()) 202 patternBoundaries = FloatRect(attributes.x().valueAsPercentage() * targetRect.width(), 203 attributes.y().valueAsPercentage() * targetRect.height(), 204 attributes.width().valueAsPercentage() * targetRect.width(), 205 attributes.height().valueAsPercentage() * targetRect.height()); 206 else 207 patternBoundaries = FloatRect(attributes.x().value(this), 208 attributes.y().value(this), 209 attributes.width().value(this), 210 attributes.height().value(this)); 211 212 IntSize patternSize(patternBoundaries.width(), patternBoundaries.height()); 213 clampImageBufferSizeToViewport(document()->view(), patternSize); 214 215 if (patternSize.width() < static_cast<int>(patternBoundaries.width())) 216 patternBoundaries.setWidth(patternSize.width()); 217 218 if (patternSize.height() < static_cast<int>(patternBoundaries.height())) 219 patternBoundaries.setHeight(patternSize.height()); 220 221 // Eventually calculate the pattern content boundaries (only needed with overflow="visible"). 222 RenderStyle* style = renderer()->style(); 223 if (style->overflowX() == OVISIBLE && style->overflowY() == OVISIBLE) { 224 for (Node* n = attributes.patternContentElement()->firstChild(); n; n = n->nextSibling()) { 225 if (!n->isSVGElement() || !static_cast<SVGElement*>(n)->isStyledTransformable() || !n->renderer()) 226 continue; 227 patternContentBoundaries.unite(n->renderer()->repaintRectInLocalCoordinates()); 228 } 229 } 230 231 AffineTransform viewBoxCTM = viewBoxToViewTransform(viewBox(), preserveAspectRatio(), patternBoundaries.width(), patternBoundaries.height()); 232 FloatRect patternBoundariesIncludingOverflow = patternBoundaries; 233 234 // Apply objectBoundingBoxMode fixup for patternContentUnits, if viewBox is not set. 235 if (!patternContentBoundaries.isEmpty()) { 236 if (!viewBoxCTM.isIdentity()) 237 patternContentBoundaries = viewBoxCTM.mapRect(patternContentBoundaries); 238 else if (attributes.boundingBoxModeContent()) 239 patternContentBoundaries = FloatRect(patternContentBoundaries.x() * targetRect.width(), 240 patternContentBoundaries.y() * targetRect.height(), 241 patternContentBoundaries.width() * targetRect.width(), 242 patternContentBoundaries.height() * targetRect.height()); 243 244 patternBoundariesIncludingOverflow.unite(patternContentBoundaries); 245 } 246 247 IntSize imageSize(lroundf(patternBoundariesIncludingOverflow.width()), lroundf(patternBoundariesIncludingOverflow.height())); 248 clampImageBufferSizeToViewport(document()->view(), imageSize); 249 250 OwnPtr<ImageBuffer> patternImage = ImageBuffer::create(imageSize); 251 252 if (!patternImage) 253 return; 254 255 GraphicsContext* context = patternImage->context(); 256 ASSERT(context); 257 258 context->save(); 259 260 // Move to pattern start origin 261 if (patternBoundariesIncludingOverflow.location() != patternBoundaries.location()) { 262 context->translate(patternBoundaries.x() - patternBoundariesIncludingOverflow.x(), 263 patternBoundaries.y() - patternBoundariesIncludingOverflow.y()); 264 265 patternBoundaries.setLocation(patternBoundariesIncludingOverflow.location()); 266 } 267 268 // Process viewBox or boundingBoxModeContent correction 269 if (!viewBoxCTM.isIdentity()) 270 context->concatCTM(viewBoxCTM); 271 else if (attributes.boundingBoxModeContent()) { 272 context->translate(targetRect.x(), targetRect.y()); 273 context->scale(FloatSize(targetRect.width(), targetRect.height())); 274 } 275 276 // Render subtree into ImageBuffer 277 for (Node* n = attributes.patternContentElement()->firstChild(); n; n = n->nextSibling()) { 278 if (!n->isSVGElement() || !static_cast<SVGElement*>(n)->isStyled() || !n->renderer()) 279 continue; 280 renderSubtreeToImage(patternImage.get(), n->renderer()); 281 } 282 283 context->restore(); 284 285 m_resource->setPatternTransform(attributes.patternTransform()); 286 m_resource->setPatternBoundaries(patternBoundaries); 287 m_resource->setTile(patternImage.release()); 288 } 289 290 RenderObject* SVGPatternElement::createRenderer(RenderArena* arena, RenderStyle*) 291 { 292 RenderSVGContainer* patternContainer = new (arena) RenderSVGContainer(this); 293 patternContainer->setDrawsContents(false); 294 return patternContainer; 295 } 296 297 SVGResource* SVGPatternElement::canvasResource(const RenderObject*) 298 { 299 if (!m_resource) 300 m_resource = SVGPaintServerPattern::create(this); 301 302 return m_resource.get(); 303 } 304 305 PatternAttributes SVGPatternElement::collectPatternProperties() const 306 { 307 PatternAttributes attributes; 308 HashSet<const SVGPatternElement*> processedPatterns; 309 310 const SVGPatternElement* current = this; 311 while (current) { 312 if (!attributes.hasX() && current->hasAttribute(SVGNames::xAttr)) 313 attributes.setX(current->x()); 314 315 if (!attributes.hasY() && current->hasAttribute(SVGNames::yAttr)) 316 attributes.setY(current->y()); 317 318 if (!attributes.hasWidth() && current->hasAttribute(SVGNames::widthAttr)) 319 attributes.setWidth(current->width()); 320 321 if (!attributes.hasHeight() && current->hasAttribute(SVGNames::heightAttr)) 322 attributes.setHeight(current->height()); 323 324 if (!attributes.hasBoundingBoxMode() && current->hasAttribute(SVGNames::patternUnitsAttr)) 325 attributes.setBoundingBoxMode(current->patternUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX); 326 327 if (!attributes.hasBoundingBoxModeContent() && current->hasAttribute(SVGNames::patternContentUnitsAttr)) 328 attributes.setBoundingBoxModeContent(current->patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX); 329 330 if (!attributes.hasPatternTransform() && current->hasAttribute(SVGNames::patternTransformAttr)) 331 attributes.setPatternTransform(current->patternTransform()->consolidate().matrix()); 332 333 if (!attributes.hasPatternContentElement() && current->hasChildNodes()) 334 attributes.setPatternContentElement(current); 335 336 processedPatterns.add(current); 337 338 // Respect xlink:href, take attributes from referenced element 339 Node* refNode = ownerDocument()->getElementById(SVGURIReference::getTarget(current->href())); 340 if (refNode && refNode->hasTagName(SVGNames::patternTag)) { 341 current = static_cast<const SVGPatternElement*>(const_cast<const Node*>(refNode)); 342 343 // Cycle detection 344 if (processedPatterns.contains(current)) 345 return PatternAttributes(); 346 } else 347 current = 0; 348 } 349 350 return attributes; 351 } 352 353 } 354 355 #endif // ENABLE(SVG) 356