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| 1 /* | |
| 2 * Copyright (C) 2011 Leo Yang <leoyang@webkit.org> | |
| 3 * | |
| 4 * This library is free software; you can redistribute it and/or | |
| 5 * modify it under the terms of the GNU Library General Public | |
| 6 * License as published by the Free Software Foundation; either | |
| 7 * version 2 of the License, or (at your option) any later version. | |
| 8 * | |
| 9 * This library is distributed in the hope that it will be useful, | |
| 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 * Library General Public License for more details. | |
| 13 * | |
| 14 * You should have received a copy of the GNU Library General Public License | |
| 15 * along with this library; see the file COPYING.LIB. If not, write to | |
| 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
| 17 * Boston, MA 02110-1301, USA. | |
| 18 */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 | |
| 22 #if ENABLE(SVG_FONTS) | |
| 23 #include "core/svg/SVGAltGlyphDefElement.h" | |
| 24 | |
| 25 #include "core/SVGNames.h" | |
| 26 #include "core/dom/ElementTraversal.h" | |
| 27 #include "core/svg/SVGAltGlyphItemElement.h" | |
| 28 #include "core/svg/SVGGlyphRefElement.h" | |
| 29 | |
| 30 namespace blink { | |
| 31 | |
| 32 inline SVGAltGlyphDefElement::SVGAltGlyphDefElement(Document& document) | |
| 33 : SVGElement(SVGNames::altGlyphDefTag, document) | |
| 34 { | |
| 35 } | |
| 36 | |
| 37 DEFINE_NODE_FACTORY(SVGAltGlyphDefElement) | |
| 38 | |
| 39 bool SVGAltGlyphDefElement::hasValidGlyphElements(Vector<AtomicString>& glyphNam
es) const | |
| 40 { | |
| 41 // Spec: http://www.w3.org/TR/SVG/text.html#AltGlyphDefElement | |
| 42 // An 'altGlyphDef' can contain either of the following: | |
| 43 // | |
| 44 // 1. In the simplest case, an 'altGlyphDef' contains one or more 'glyphRef'
elements. | |
| 45 // Each 'glyphRef' element references a single glyph within a particular fon
t. | |
| 46 // If all of the referenced glyphs are available, then these glyphs are rend
ered | |
| 47 // instead of the character(s) inside of the referencing 'altGlyph' element. | |
| 48 // If any of the referenced glyphs are unavailable, then the character(s) th
at are | |
| 49 // inside of the 'altGlyph' element are rendered as if there were not an 'al
tGlyph' | |
| 50 // element surrounding those characters. | |
| 51 // | |
| 52 // 2. In the more complex case, an 'altGlyphDef' contains one or more 'altGl
yphItem' elements. | |
| 53 // Each 'altGlyphItem' represents a candidate set of substitute glyphs. Each
'altGlyphItem' | |
| 54 // contains one or more 'glyphRef' elements. Each 'glyphRef' element referen
ces a single | |
| 55 // glyph within a particular font. The first 'altGlyphItem' in which all ref
erenced glyphs | |
| 56 // are available is chosen. The glyphs referenced from this 'altGlyphItem' a
re rendered | |
| 57 // instead of the character(s) that are inside of the referencing 'altGlyph'
element. | |
| 58 // If none of the 'altGlyphItem' elements result in a successful match (i.e.
, none of the | |
| 59 // 'altGlyphItem' elements has all of its referenced glyphs available), then
the character(s) | |
| 60 // that are inside of the 'altGlyph' element are rendered as if there were n
ot an 'altGlyph' | |
| 61 // element surrounding those characters. | |
| 62 // | |
| 63 // The spec doesn't tell how to deal with the mixing of <glyphRef> and <altG
lyItem>. | |
| 64 // However, we determine content model by the the type of the first appearin
g element | |
| 65 // just like Opera 11 does. After the content model is determined we skip el
ements | |
| 66 // which don't comform to it. For example: | |
| 67 // a. <altGlyphDef> | |
| 68 // <glyphRef id="g1" /> | |
| 69 // <altGlyphItem id="i1"> ... </altGlyphItem> | |
| 70 // <glyphRef id="g2" /> | |
| 71 // </altGlyphDef> | |
| 72 // | |
| 73 // b. <altGlyphDef> | |
| 74 // <altGlyphItem id="i1"> ... </altGlyphItem> | |
| 75 // <altGlyphItem id="i2"> ... </altGlyphItem> | |
| 76 // <glyphRef id="g1" /> | |
| 77 // <glyphRef id="g2" /> | |
| 78 // </altGlyphDef> | |
| 79 // For a), the content model is 1), so we will use "g1" and "g2" if they are
all valid | |
| 80 // and "i1" is skipped. | |
| 81 // For b), the content model is 2), so we will use <glyphRef> elements conta
ined in | |
| 82 // "i1" if they are valid and "g1" and "g2" are skipped. | |
| 83 | |
| 84 // These 2 variables are used to determine content model. | |
| 85 bool fountFirstGlyphRef = false; | |
| 86 bool foundFirstAltGlyphItem = false; | |
| 87 | |
| 88 for (SVGElement* child = Traversal<SVGElement>::firstChild(*this); child; ch
ild = Traversal<SVGElement>::nextSibling(*child)) { | |
| 89 if (!foundFirstAltGlyphItem && isSVGGlyphRefElement(*child)) { | |
| 90 fountFirstGlyphRef = true; | |
| 91 AtomicString referredGlyphName; | |
| 92 | |
| 93 if (toSVGGlyphRefElement(child)->hasValidGlyphElement(referredGlyphN
ame)) | |
| 94 glyphNames.append(referredGlyphName); | |
| 95 else { | |
| 96 // As the spec says "If any of the referenced glyphs are unavail
able, | |
| 97 // then the character(s) that are inside of the 'altGlyph' eleme
nt are | |
| 98 // rendered as if there were not an 'altGlyph' element surroundi
ng | |
| 99 // those characters.". | |
| 100 glyphNames.clear(); | |
| 101 return false; | |
| 102 } | |
| 103 } else if (!fountFirstGlyphRef && isSVGAltGlyphItemElement(*child)) { | |
| 104 foundFirstAltGlyphItem = true; | |
| 105 Vector<AtomicString> referredGlyphNames; | |
| 106 | |
| 107 // As the spec says "The first 'altGlyphItem' in which all reference
d glyphs | |
| 108 // are available is chosen." | |
| 109 if (toSVGAltGlyphItemElement(child)->hasValidGlyphElements(glyphName
s) && !glyphNames.isEmpty()) | |
| 110 return true; | |
| 111 } | |
| 112 } | |
| 113 return !glyphNames.isEmpty(); | |
| 114 } | |
| 115 | |
| 116 } | |
| 117 | |
| 118 #endif | |
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