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1 /* |
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2 Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org> |
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3 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org> |
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4 2008 Eric Seidel <eric@webkit.org> |
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5 2008 Dirk Schulze <krit@webkit.org> |
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6 Copyright (C) Research In Motion Limited 2010. All rights reserved. |
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7 |
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8 This library is free software; you can redistribute it and/or |
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9 modify it under the terms of the GNU Library General Public |
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10 License as published by the Free Software Foundation; either |
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11 version 2 of the License, or (at your option) any later version. |
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12 |
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13 This library is distributed in the hope that it will be useful, |
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 Library General Public License for more details. |
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17 |
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18 You should have received a copy of the GNU Library General Public License |
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19 along with this library; see the file COPYING.LIB. If not, write to |
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20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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21 Boston, MA 02110-1301, USA. |
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22 */ |
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23 |
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24 #include "config.h" |
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25 |
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26 #if ENABLE(SVG) |
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27 #include "SVGRadialGradientElement.h" |
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28 |
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29 #include "Attribute.h" |
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30 #include "FloatConversion.h" |
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31 #include "FloatPoint.h" |
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32 #include "RadialGradientAttributes.h" |
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33 #include "RenderSVGResourceRadialGradient.h" |
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34 #include "SVGLength.h" |
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35 #include "SVGNames.h" |
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36 #include "SVGStopElement.h" |
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37 #include "SVGTransform.h" |
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38 #include "SVGTransformList.h" |
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39 #include "SVGUnitTypes.h" |
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40 |
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41 namespace WebCore { |
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42 |
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43 SVGRadialGradientElement::SVGRadialGradientElement(const QualifiedName& tagName, Document* doc) |
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44 : SVGGradientElement(tagName, doc) |
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45 , m_cx(LengthModeWidth, "50%") |
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46 , m_cy(LengthModeHeight, "50%") |
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47 , m_r(LengthModeOther, "50%") |
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48 , m_fx(LengthModeWidth) |
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49 , m_fy(LengthModeHeight) |
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50 { |
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51 // Spec: If the cx/cy/r attribute is not specified, the effect is as if a value of "50%" were specified. |
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52 } |
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53 |
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54 SVGRadialGradientElement::~SVGRadialGradientElement() |
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55 { |
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56 } |
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57 |
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58 void SVGRadialGradientElement::parseMappedAttribute(Attribute* attr) |
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59 { |
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60 if (attr->name() == SVGNames::cxAttr) |
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61 setCxBaseValue(SVGLength(LengthModeWidth, attr->value())); |
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62 else if (attr->name() == SVGNames::cyAttr) |
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63 setCyBaseValue(SVGLength(LengthModeHeight, attr->value())); |
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64 else if (attr->name() == SVGNames::rAttr) { |
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65 setRBaseValue(SVGLength(LengthModeOther, attr->value())); |
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66 if (rBaseValue().value(this) < 0.0) |
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67 document()->accessSVGExtensions()->reportError("A negative value for radial gradient radius <r> is not allowed"); |
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68 } else if (attr->name() == SVGNames::fxAttr) |
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69 setFxBaseValue(SVGLength(LengthModeWidth, attr->value())); |
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70 else if (attr->name() == SVGNames::fyAttr) |
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71 setFyBaseValue(SVGLength(LengthModeHeight, attr->value())); |
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72 else |
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73 SVGGradientElement::parseMappedAttribute(attr); |
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74 } |
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75 |
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76 void SVGRadialGradientElement::svgAttributeChanged(const QualifiedName& attrName) |
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77 { |
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78 SVGGradientElement::svgAttributeChanged(attrName); |
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79 |
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80 if (attrName == SVGNames::cxAttr |
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81 || attrName == SVGNames::cyAttr |
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82 || attrName == SVGNames::fxAttr |
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83 || attrName == SVGNames::fyAttr |
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84 || attrName == SVGNames::rAttr) { |
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85 updateRelativeLengthsInformation(); |
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86 invalidateResourceClients(); |
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87 } |
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88 } |
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89 |
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90 void SVGRadialGradientElement::synchronizeProperty(const QualifiedName& attrName) |
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91 { |
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92 SVGGradientElement::synchronizeProperty(attrName); |
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93 |
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94 if (attrName == anyQName()) { |
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95 synchronizeCx(); |
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96 synchronizeCy(); |
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97 synchronizeFx(); |
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98 synchronizeFy(); |
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99 synchronizeR(); |
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100 return; |
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101 } |
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102 |
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103 if (attrName == SVGNames::cxAttr) |
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104 synchronizeCx(); |
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105 else if (attrName == SVGNames::cyAttr) |
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106 synchronizeCy(); |
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107 else if (attrName == SVGNames::fxAttr) |
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108 synchronizeFx(); |
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109 else if (attrName == SVGNames::fyAttr) |
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110 synchronizeFy(); |
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111 else if (attrName == SVGNames::rAttr) |
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112 synchronizeR(); |
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113 } |
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114 |
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115 RenderObject* SVGRadialGradientElement::createRenderer(RenderArena* arena, RenderStyle*) |
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116 { |
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117 return new (arena) RenderSVGResourceRadialGradient(this); |
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118 } |
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119 |
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120 RadialGradientAttributes SVGRadialGradientElement::collectGradientProperties() |
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121 { |
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122 RadialGradientAttributes attributes; |
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123 HashSet<SVGGradientElement*> processedGradients; |
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124 |
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125 bool isRadial = true; |
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126 SVGGradientElement* current = this; |
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127 |
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128 while (current) { |
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129 if (!attributes.hasSpreadMethod() && current->hasAttribute(SVGNames::spreadMethodAttr)) |
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130 attributes.setSpreadMethod((GradientSpreadMethod) current->spreadMethod()); |
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131 |
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132 if (!attributes.hasBoundingBoxMode() && current->hasAttribute(SVGNames::gradientUnitsAttr)) |
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133 attributes.setBoundingBoxMode(current->gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX); |
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134 |
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135 if (!attributes.hasGradientTransform() && current->hasAttribute(SVGNames::gradientTransformAttr)) |
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136 attributes.setGradientTransform(current->gradientTransform()->consolidate().matrix()); |
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137 |
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138 if (!attributes.hasStops()) { |
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139 const Vector<Gradient::ColorStop>& stops(current->buildStops()); |
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140 if (!stops.isEmpty()) |
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141 attributes.setStops(stops); |
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142 } |
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143 |
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144 if (isRadial) { |
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145 SVGRadialGradientElement* radial = static_cast<SVGRadialGradientElement*>(current); |
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146 |
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147 if (!attributes.hasCx() && current->hasAttribute(SVGNames::cxAttr)) |
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148 attributes.setCx(radial->cx()); |
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149 |
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150 if (!attributes.hasCy() && current->hasAttribute(SVGNames::cyAttr)) |
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151 attributes.setCy(radial->cy()); |
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152 |
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153 if (!attributes.hasR() && current->hasAttribute(SVGNames::rAttr)) |
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154 attributes.setR(radial->r()); |
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155 |
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156 if (!attributes.hasFx() && current->hasAttribute(SVGNames::fxAttr)) |
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157 attributes.setFx(radial->fx()); |
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158 |
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159 if (!attributes.hasFy() && current->hasAttribute(SVGNames::fyAttr)) |
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160 attributes.setFy(radial->fy()); |
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161 } |
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162 |
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163 processedGradients.add(current); |
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164 |
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165 // Respect xlink:href, take attributes from referenced element |
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166 Node* refNode = ownerDocument()->getElementById(SVGURIReference::getTarget(current->href())); |
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167 if (refNode && (refNode->hasTagName(SVGNames::radialGradientTag) || refNode->hasTagName(SVGNames::linearGradientTag))) { |
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168 current = static_cast<SVGGradientElement*>(refNode); |
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169 |
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170 // Cycle detection |
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171 if (processedGradients.contains(current)) |
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172 return RadialGradientAttributes(); |
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173 |
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174 isRadial = current->hasTagName(SVGNames::radialGradientTag); |
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175 } else |
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176 current = 0; |
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177 } |
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178 |
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179 // Handle default values for fx/fy |
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180 if (!attributes.hasFx()) |
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181 attributes.setFx(attributes.cx()); |
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182 |
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183 if (!attributes.hasFy()) |
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184 attributes.setFy(attributes.cy()); |
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185 |
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186 return attributes; |
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187 } |
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188 |
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189 void SVGRadialGradientElement::calculateFocalCenterPointsAndRadius(const RadialGradientAttributes& attributes, FloatPoint& focalPoint, FloatPoint& centerPoint, float& radius) |
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190 { |
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191 // Determine gradient focal/center points and radius |
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192 if (attributes.boundingBoxMode()) { |
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193 focalPoint = FloatPoint(attributes.fx().valueAsPercentage(), attributes.fy().valueAsPercentage()); |
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194 centerPoint = FloatPoint(attributes.cx().valueAsPercentage(), attributes.cy().valueAsPercentage()); |
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195 radius = attributes.r().valueAsPercentage(); |
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196 } else { |
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197 focalPoint = FloatPoint(attributes.fx().value(this), attributes.fy().value(this)); |
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198 centerPoint = FloatPoint(attributes.cx().value(this), attributes.cy().value(this)); |
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199 radius = attributes.r().value(this); |
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200 } |
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201 |
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202 // Eventually adjust focal points, as described below |
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203 float deltaX = focalPoint.x() - centerPoint.x(); |
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204 float deltaY = focalPoint.y() - centerPoint.y(); |
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205 float radiusMax = 0.99f * radius; |
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206 |
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207 // Spec: If (fx, fy) lies outside the circle defined by (cx, cy) and r, set |
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208 // (fx, fy) to the point of intersection of the line through (fx, fy) and the circle. |
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209 // We scale the radius by 0.99 to match the behavior of FireFox. |
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210 if (sqrt(deltaX * deltaX + deltaY * deltaY) > radiusMax) { |
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211 float angle = atan2f(deltaY, deltaX); |
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212 |
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213 deltaX = cosf(angle) * radiusMax; |
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214 deltaY = sinf(angle) * radiusMax; |
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215 focalPoint = FloatPoint(deltaX + centerPoint.x(), deltaY + centerPoint.y()); |
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216 } |
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217 } |
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218 |
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219 bool SVGRadialGradientElement::selfHasRelativeLengths() const |
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220 { |
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221 return cy().isRelative() |
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222 || cy().isRelative() |
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223 || r().isRelative() |
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224 || fx().isRelative() |
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225 || fy().isRelative(); |
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226 } |
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227 |
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228 } |
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229 |
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230 #endif // ENABLE(SVG) |