1 /*
2 * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2006, 2007, 2010 Rob Buis <buis@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 "SVGFitToViewBox.h"
25
26 #include "AffineTransform.h"
27 #include "Attr.h"
28 #include "Document.h"
29 #include "FloatRect.h"
30 #include "SVGDocumentExtensions.h"
31 #include "SVGNames.h"
32 #include "SVGParserUtilities.h"
33 #include "SVGPreserveAspectRatio.h"
34 #include <wtf/text/StringImpl.h>
35
36 namespace WebCore {
37
parseViewBox(Document * doc,const String & s,FloatRect & viewBox)38 bool SVGFitToViewBox::parseViewBox(Document* doc, const String& s, FloatRect& viewBox)
39 {
40 const UChar* c = s.characters();
41 const UChar* end = c + s.length();
42 return parseViewBox(doc, c, end, viewBox, true);
43 }
44
parseViewBox(Document * doc,const UChar * & c,const UChar * end,FloatRect & viewBox,bool validate)45 bool SVGFitToViewBox::parseViewBox(Document* doc, const UChar*& c, const UChar* end, FloatRect& viewBox, bool validate)
46 {
47 String str(c, end - c);
48
49 skipOptionalSpaces(c, end);
50
51 float x = 0.0f;
52 float y = 0.0f;
53 float width = 0.0f;
54 float height = 0.0f;
55 bool valid = parseNumber(c, end, x) && parseNumber(c, end, y) && parseNumber(c, end, width) && parseNumber(c, end, height, false);
56 if (!validate) {
57 viewBox = FloatRect(x, y, width, height);
58 return true;
59 }
60 if (!valid) {
61 doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");
62 return false;
63 }
64
65 if (width < 0.0) { // check that width is positive
66 doc->accessSVGExtensions()->reportError("A negative value for ViewBox width is not allowed");
67 return false;
68 }
69 if (height < 0.0) { // check that height is positive
70 doc->accessSVGExtensions()->reportError("A negative value for ViewBox height is not allowed");
71 return false;
72 }
73 skipOptionalSpaces(c, end);
74 if (c < end) { // nothing should come after the last, fourth number
75 doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");
76 return false;
77 }
78
79 viewBox = FloatRect(x, y, width, height);
80 return true;
81 }
82
viewBoxToViewTransform(const FloatRect & viewBoxRect,const SVGPreserveAspectRatio & preserveAspectRatio,float viewWidth,float viewHeight)83 AffineTransform SVGFitToViewBox::viewBoxToViewTransform(const FloatRect& viewBoxRect, const SVGPreserveAspectRatio& preserveAspectRatio, float viewWidth, float viewHeight)
84 {
85 if (!viewBoxRect.width() || !viewBoxRect.height())
86 return AffineTransform();
87
88 return preserveAspectRatio.getCTM(viewBoxRect.x(), viewBoxRect.y(), viewBoxRect.width(), viewBoxRect.height(), viewWidth, viewHeight);
89 }
90
parseMappedAttribute(Document * document,Attribute * attr)91 bool SVGFitToViewBox::parseMappedAttribute(Document* document, Attribute* attr)
92 {
93 if (attr->name() == SVGNames::viewBoxAttr) {
94 FloatRect viewBox;
95 if (!attr->value().isNull()) {
96 if (!parseViewBox(document, attr->value(), viewBox))
97 return true;
98 }
99 setViewBoxBaseValue(viewBox);
100 } else if (attr->name() == SVGNames::preserveAspectRatioAttr) {
101 SVGPreserveAspectRatio::parsePreserveAspectRatio(this, attr->value());
102 return true;
103 }
104
105 return false;
106 }
107
isKnownAttribute(const QualifiedName & attrName)108 bool SVGFitToViewBox::isKnownAttribute(const QualifiedName& attrName)
109 {
110 return attrName == SVGNames::viewBoxAttr || attrName == SVGNames::preserveAspectRatioAttr;
111 }
112
113 }
114
115 #endif // ENABLE(SVG)
116