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1 /*
2  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
3  * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
4  * Copyright (C) 2008 Apple Inc. All rights reserved.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public License
17  * along with this library; see the file COPYING.LIB.  If not, write to
18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19  * Boston, MA 02110-1301, USA.
20  */
21 
22 #include "config.h"
23 
24 #if ENABLE(SVG_FONTS)
25 #include "SVGFontFaceElement.h"
26 
27 #include "Attribute.h"
28 #include "CSSFontFaceRule.h"
29 #include "CSSFontFaceSrcValue.h"
30 #include "CSSParser.h"
31 #include "CSSProperty.h"
32 #include "CSSPropertyNames.h"
33 #include "CSSStyleSelector.h"
34 #include "CSSStyleSheet.h"
35 #include "CSSValueKeywords.h"
36 #include "CSSValueList.h"
37 #include "Document.h"
38 #include "Font.h"
39 #include "SVGFontElement.h"
40 #include "SVGFontFaceSrcElement.h"
41 #include "SVGGlyphElement.h"
42 #include "SVGNames.h"
43 #include <math.h>
44 
45 namespace WebCore {
46 
47 using namespace SVGNames;
48 
SVGFontFaceElement(const QualifiedName & tagName,Document * document)49 inline SVGFontFaceElement::SVGFontFaceElement(const QualifiedName& tagName, Document* document)
50     : SVGElement(tagName, document)
51     , m_fontFaceRule(CSSFontFaceRule::create())
52     , m_styleDeclaration(CSSMutableStyleDeclaration::create())
53 {
54     m_styleDeclaration->setParent(document->mappedElementSheet());
55     m_styleDeclaration->setStrictParsing(true);
56     m_fontFaceRule->setDeclaration(m_styleDeclaration.get());
57 }
58 
create(const QualifiedName & tagName,Document * document)59 PassRefPtr<SVGFontFaceElement> SVGFontFaceElement::create(const QualifiedName& tagName, Document* document)
60 {
61     return adoptRef(new SVGFontFaceElement(tagName, document));
62 }
63 
cssPropertyIdForSVGAttributeName(const QualifiedName & attrName)64 static int cssPropertyIdForSVGAttributeName(const QualifiedName& attrName)
65 {
66     if (!attrName.namespaceURI().isNull())
67         return 0;
68 
69     static HashMap<AtomicStringImpl*, int>* propertyNameToIdMap = 0;
70     if (!propertyNameToIdMap) {
71         propertyNameToIdMap = new HashMap<AtomicStringImpl*, int>;
72         // This is a list of all @font-face CSS properties which are exposed as SVG XML attributes
73         // Those commented out are not yet supported by WebCore's style system
74         // mapAttributeToCSSProperty(propertyNameToIdMap, accent_heightAttr);
75         // mapAttributeToCSSProperty(propertyNameToIdMap, alphabeticAttr);
76         // mapAttributeToCSSProperty(propertyNameToIdMap, ascentAttr);
77         // mapAttributeToCSSProperty(propertyNameToIdMap, bboxAttr);
78         // mapAttributeToCSSProperty(propertyNameToIdMap, cap_heightAttr);
79         // mapAttributeToCSSProperty(propertyNameToIdMap, descentAttr);
80         mapAttributeToCSSProperty(propertyNameToIdMap, font_familyAttr);
81         mapAttributeToCSSProperty(propertyNameToIdMap, font_sizeAttr);
82         mapAttributeToCSSProperty(propertyNameToIdMap, font_stretchAttr);
83         mapAttributeToCSSProperty(propertyNameToIdMap, font_styleAttr);
84         mapAttributeToCSSProperty(propertyNameToIdMap, font_variantAttr);
85         mapAttributeToCSSProperty(propertyNameToIdMap, font_weightAttr);
86         // mapAttributeToCSSProperty(propertyNameToIdMap, hangingAttr);
87         // mapAttributeToCSSProperty(propertyNameToIdMap, ideographicAttr);
88         // mapAttributeToCSSProperty(propertyNameToIdMap, mathematicalAttr);
89         // mapAttributeToCSSProperty(propertyNameToIdMap, overline_positionAttr);
90         // mapAttributeToCSSProperty(propertyNameToIdMap, overline_thicknessAttr);
91         // mapAttributeToCSSProperty(propertyNameToIdMap, panose_1Attr);
92         // mapAttributeToCSSProperty(propertyNameToIdMap, slopeAttr);
93         // mapAttributeToCSSProperty(propertyNameToIdMap, stemhAttr);
94         // mapAttributeToCSSProperty(propertyNameToIdMap, stemvAttr);
95         // mapAttributeToCSSProperty(propertyNameToIdMap, strikethrough_positionAttr);
96         // mapAttributeToCSSProperty(propertyNameToIdMap, strikethrough_thicknessAttr);
97         // mapAttributeToCSSProperty(propertyNameToIdMap, underline_positionAttr);
98         // mapAttributeToCSSProperty(propertyNameToIdMap, underline_thicknessAttr);
99         // mapAttributeToCSSProperty(propertyNameToIdMap, unicode_rangeAttr);
100         // mapAttributeToCSSProperty(propertyNameToIdMap, units_per_emAttr);
101         // mapAttributeToCSSProperty(propertyNameToIdMap, v_alphabeticAttr);
102         // mapAttributeToCSSProperty(propertyNameToIdMap, v_hangingAttr);
103         // mapAttributeToCSSProperty(propertyNameToIdMap, v_ideographicAttr);
104         // mapAttributeToCSSProperty(propertyNameToIdMap, v_mathematicalAttr);
105         // mapAttributeToCSSProperty(propertyNameToIdMap, widthsAttr);
106         // mapAttributeToCSSProperty(propertyNameToIdMap, x_heightAttr);
107     }
108 
109     return propertyNameToIdMap->get(attrName.localName().impl());
110 }
111 
parseMappedAttribute(Attribute * attr)112 void SVGFontFaceElement::parseMappedAttribute(Attribute* attr)
113 {
114     int propId = cssPropertyIdForSVGAttributeName(attr->name());
115     if (propId > 0) {
116         m_styleDeclaration->setProperty(propId, attr->value(), false);
117         rebuildFontFace();
118         return;
119     }
120 
121     SVGElement::parseMappedAttribute(attr);
122 }
123 
unitsPerEm() const124 unsigned SVGFontFaceElement::unitsPerEm() const
125 {
126     const AtomicString& value = getAttribute(units_per_emAttr);
127     if (value.isEmpty())
128         return gDefaultUnitsPerEm;
129 
130     return static_cast<unsigned>(ceilf(value.toFloat()));
131 }
132 
xHeight() const133 int SVGFontFaceElement::xHeight() const
134 {
135     return static_cast<int>(ceilf(getAttribute(x_heightAttr).toFloat()));
136 }
137 
horizontalOriginX() const138 float SVGFontFaceElement::horizontalOriginX() const
139 {
140     if (!m_fontElement)
141         return 0.0f;
142 
143     // Spec: The X-coordinate in the font coordinate system of the origin of a glyph to be used when
144     // drawing horizontally oriented text. (Note that the origin applies to all glyphs in the font.)
145     // If the attribute is not specified, the effect is as if a value of "0" were specified.
146     return m_fontElement->getAttribute(horiz_origin_xAttr).toFloat();
147 }
148 
horizontalOriginY() const149 float SVGFontFaceElement::horizontalOriginY() const
150 {
151     if (!m_fontElement)
152         return 0.0f;
153 
154     // Spec: The Y-coordinate in the font coordinate system of the origin of a glyph to be used when
155     // drawing horizontally oriented text. (Note that the origin applies to all glyphs in the font.)
156     // If the attribute is not specified, the effect is as if a value of "0" were specified.
157     return m_fontElement->getAttribute(horiz_origin_yAttr).toFloat();
158 }
159 
horizontalAdvanceX() const160 float SVGFontFaceElement::horizontalAdvanceX() const
161 {
162     if (!m_fontElement)
163         return 0.0f;
164 
165     // Spec: The default horizontal advance after rendering a glyph in horizontal orientation. Glyph
166     // widths are required to be non-negative, even if the glyph is typically rendered right-to-left,
167     // as in Hebrew and Arabic scripts.
168     return m_fontElement->getAttribute(horiz_adv_xAttr).toFloat();
169 }
170 
verticalOriginX() const171 float SVGFontFaceElement::verticalOriginX() const
172 {
173     if (!m_fontElement)
174         return 0.0f;
175 
176     // Spec: The default X-coordinate in the font coordinate system of the origin of a glyph to be used when
177     // drawing vertically oriented text. If the attribute is not specified, the effect is as if the attribute
178     // were set to half of the effective value of attribute horiz-adv-x.
179     const AtomicString& value = m_fontElement->getAttribute(vert_origin_xAttr);
180     if (value.isEmpty())
181         return horizontalAdvanceX() / 2.0f;
182 
183     return value.toFloat();
184 }
185 
verticalOriginY() const186 float SVGFontFaceElement::verticalOriginY() const
187 {
188     if (!m_fontElement)
189         return 0.0f;
190 
191     // Spec: The default Y-coordinate in the font coordinate system of the origin of a glyph to be used when
192     // drawing vertically oriented text. If the attribute is not specified, the effect is as if the attribute
193     // were set to the position specified by the font's ascent attribute.
194     const AtomicString& value = m_fontElement->getAttribute(vert_origin_yAttr);
195     if (value.isEmpty())
196         return ascent();
197 
198     return value.toFloat();
199 }
200 
verticalAdvanceY() const201 float SVGFontFaceElement::verticalAdvanceY() const
202 {
203     if (!m_fontElement)
204         return 0.0f;
205 
206     // Spec: The default vertical advance after rendering a glyph in vertical orientation. If the attribute is
207     // not specified, the effect is as if a value equivalent of one em were specified (see units-per-em).
208     const AtomicString& value = m_fontElement->getAttribute(vert_adv_yAttr);
209        if (value.isEmpty())
210         return 1.0f;
211 
212     return value.toFloat();
213 }
214 
ascent() const215 int SVGFontFaceElement::ascent() const
216 {
217     // Spec: Same syntax and semantics as the 'ascent' descriptor within an @font-face rule. The maximum
218     // unaccented height of the font within the font coordinate system. If the attribute is not specified,
219     // the effect is as if the attribute were set to the difference between the units-per-em value and the
220     // vert-origin-y value for the corresponding font.
221     const AtomicString& ascentValue = getAttribute(ascentAttr);
222     if (!ascentValue.isEmpty())
223         return static_cast<int>(ceilf(ascentValue.toFloat()));
224 
225     if (m_fontElement) {
226         const AtomicString& vertOriginY = m_fontElement->getAttribute(vert_origin_yAttr);
227         if (!vertOriginY.isEmpty())
228             return static_cast<int>(unitsPerEm()) - static_cast<int>(ceilf(vertOriginY.toFloat()));
229     }
230 
231     // Match Batiks default value
232     return static_cast<int>(ceilf(unitsPerEm() * 0.8f));
233 }
234 
descent() const235 int SVGFontFaceElement::descent() const
236 {
237     // Spec: Same syntax and semantics as the 'descent' descriptor within an @font-face rule. The maximum
238     // unaccented depth of the font within the font coordinate system. If the attribute is not specified,
239     // the effect is as if the attribute were set to the vert-origin-y value for the corresponding font.
240     const AtomicString& descentValue = getAttribute(descentAttr);
241     if (!descentValue.isEmpty()) {
242         // 14 different W3C SVG 1.1 testcases use a negative descent value,
243         // where a positive was meant to be used  Including:
244         // animate-elem-24-t.svg, fonts-elem-01-t.svg, fonts-elem-02-t.svg (and 11 others)
245         int descent = static_cast<int>(ceilf(descentValue.toFloat()));
246         return descent < 0 ? -descent : descent;
247     }
248 
249     if (m_fontElement) {
250         const AtomicString& vertOriginY = m_fontElement->getAttribute(vert_origin_yAttr);
251         if (!vertOriginY.isEmpty())
252             return static_cast<int>(ceilf(vertOriginY.toFloat()));
253     }
254 
255     // Match Batiks default value
256     return static_cast<int>(ceilf(unitsPerEm() * 0.2f));
257 }
258 
fontFamily() const259 String SVGFontFaceElement::fontFamily() const
260 {
261     return m_styleDeclaration->getPropertyValue(CSSPropertyFontFamily);
262 }
263 
associatedFontElement() const264 SVGFontElement* SVGFontFaceElement::associatedFontElement() const
265 {
266     return m_fontElement.get();
267 }
268 
rebuildFontFace()269 void SVGFontFaceElement::rebuildFontFace()
270 {
271     if (!inDocument())
272         return;
273 
274     // we currently ignore all but the first src element, alternatively we could concat them
275     SVGFontFaceSrcElement* srcElement = 0;
276 
277     for (Node* child = firstChild(); child && !srcElement; child = child->nextSibling()) {
278         if (child->hasTagName(font_face_srcTag))
279             srcElement = static_cast<SVGFontFaceSrcElement*>(child);
280     }
281 
282     bool describesParentFont = parentNode()->hasTagName(SVGNames::fontTag);
283     RefPtr<CSSValueList> list;
284 
285     if (describesParentFont) {
286         m_fontElement = static_cast<SVGFontElement*>(parentNode());
287 
288         list = CSSValueList::createCommaSeparated();
289         list->append(CSSFontFaceSrcValue::createLocal(fontFamily()));
290     } else {
291         m_fontElement = 0;
292         if (srcElement)
293             list = srcElement->srcValue();
294     }
295 
296     if (!list || !list->length())
297         return;
298 
299     // Parse in-memory CSS rules
300     CSSProperty srcProperty(CSSPropertySrc, list);
301     const CSSProperty* srcPropertyRef = &srcProperty;
302     m_styleDeclaration->addParsedProperties(&srcPropertyRef, 1);
303 
304     if (describesParentFont) {
305         // Traverse parsed CSS values and associate CSSFontFaceSrcValue elements with ourselves.
306         RefPtr<CSSValue> src = m_styleDeclaration->getPropertyCSSValue(CSSPropertySrc);
307         CSSValueList* srcList = static_cast<CSSValueList*>(src.get());
308 
309         unsigned srcLength = srcList ? srcList->length() : 0;
310         for (unsigned i = 0; i < srcLength; i++) {
311             if (CSSFontFaceSrcValue* item = static_cast<CSSFontFaceSrcValue*>(srcList->itemWithoutBoundsCheck(i)))
312                 item->setSVGFontFaceElement(this);
313         }
314     }
315 
316     document()->styleSelectorChanged(DeferRecalcStyle);
317 }
318 
insertedIntoDocument()319 void SVGFontFaceElement::insertedIntoDocument()
320 {
321     SVGElement::insertedIntoDocument();
322     document()->mappedElementSheet()->append(m_fontFaceRule);
323     m_fontFaceRule->setParent(document()->mappedElementSheet());
324     rebuildFontFace();
325 }
326 
removedFromDocument()327 void SVGFontFaceElement::removedFromDocument()
328 {
329     removeFromMappedElementSheet();
330     SVGElement::removedFromDocument();
331 }
332 
childrenChanged(bool changedByParser,Node * beforeChange,Node * afterChange,int childCountDelta)333 void SVGFontFaceElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
334 {
335     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
336     rebuildFontFace();
337 }
338 
removeFromMappedElementSheet()339 void SVGFontFaceElement::removeFromMappedElementSheet()
340 {
341     CSSStyleSheet* mappedElementSheet = document()->mappedElementSheet();
342     if (!mappedElementSheet)
343         return;
344 
345     for (unsigned i = 0; i < mappedElementSheet->length(); ++i) {
346         if (mappedElementSheet->item(i) == m_fontFaceRule) {
347             mappedElementSheet->remove(i);
348             break;
349         }
350     }
351     document()->styleSelectorChanged(DeferRecalcStyle);
352 }
353 
354 } // namespace WebCore
355 
356 #endif // ENABLE(SVG_FONTS)
357