1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
|
/*
* Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2010 Dirk Schulze <krit@webkit.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(SVG)
#include "SVGPreserveAspectRatio.h"
#include "AffineTransform.h"
#include "FloatRect.h"
#include "SVGParserUtilities.h"
#include <wtf/text/StringConcatenate.h>
namespace WebCore {
SVGPreserveAspectRatio::SVGPreserveAspectRatio()
: m_align(SVG_PRESERVEASPECTRATIO_XMIDYMID)
, m_meetOrSlice(SVG_MEETORSLICE_MEET)
{
}
void SVGPreserveAspectRatio::setAlign(unsigned short align, ExceptionCode& ec)
{
if (align == SVG_PRESERVEASPECTRATIO_UNKNOWN || align > SVG_PRESERVEASPECTRATIO_XMAXYMAX) {
ec = NOT_SUPPORTED_ERR;
return;
}
m_align = static_cast<SVGPreserveAspectRatioType>(align);
}
void SVGPreserveAspectRatio::setMeetOrSlice(unsigned short meetOrSlice, ExceptionCode& ec)
{
if (meetOrSlice == SVG_MEETORSLICE_UNKNOWN || meetOrSlice > SVG_MEETORSLICE_SLICE) {
ec = NOT_SUPPORTED_ERR;
return;
}
m_meetOrSlice = static_cast<SVGMeetOrSliceType>(meetOrSlice);
}
SVGPreserveAspectRatio SVGPreserveAspectRatio::parsePreserveAspectRatio(const UChar*& currParam, const UChar* end, bool validate, bool& result)
{
SVGPreserveAspectRatio aspectRatio;
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_NONE;
aspectRatio.m_meetOrSlice = SVG_MEETORSLICE_MEET;
result = false;
// FIXME: Rewrite this parser, without gotos!
if (!skipOptionalSpaces(currParam, end))
goto bailOut;
if (*currParam == 'd') {
if (!skipString(currParam, end, "defer"))
goto bailOut;
// FIXME: We just ignore the "defer" here.
if (!skipOptionalSpaces(currParam, end))
goto bailOut;
}
if (*currParam == 'n') {
if (!skipString(currParam, end, "none"))
goto bailOut;
skipOptionalSpaces(currParam, end);
} else if (*currParam == 'x') {
if ((end - currParam) < 8)
goto bailOut;
if (currParam[1] != 'M' || currParam[4] != 'Y' || currParam[5] != 'M')
goto bailOut;
if (currParam[2] == 'i') {
if (currParam[3] == 'n') {
if (currParam[6] == 'i') {
if (currParam[7] == 'n')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMINYMIN;
else if (currParam[7] == 'd')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMINYMID;
else
goto bailOut;
} else if (currParam[6] == 'a' && currParam[7] == 'x')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMINYMAX;
else
goto bailOut;
} else if (currParam[3] == 'd') {
if (currParam[6] == 'i') {
if (currParam[7] == 'n')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMIDYMIN;
else if (currParam[7] == 'd')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
else
goto bailOut;
} else if (currParam[6] == 'a' && currParam[7] == 'x')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMIDYMAX;
else
goto bailOut;
} else
goto bailOut;
} else if (currParam[2] == 'a' && currParam[3] == 'x') {
if (currParam[6] == 'i') {
if (currParam[7] == 'n')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMAXYMIN;
else if (currParam[7] == 'd')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMAXYMID;
else
goto bailOut;
} else if (currParam[6] == 'a' && currParam[7] == 'x')
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMAXYMAX;
else
goto bailOut;
} else
goto bailOut;
currParam += 8;
skipOptionalSpaces(currParam, end);
} else
goto bailOut;
if (currParam < end) {
if (*currParam == 'm') {
if (!skipString(currParam, end, "meet"))
goto bailOut;
skipOptionalSpaces(currParam, end);
} else if (*currParam == 's') {
if (!skipString(currParam, end, "slice"))
goto bailOut;
skipOptionalSpaces(currParam, end);
if (aspectRatio.m_align != SVG_PRESERVEASPECTRATIO_NONE)
aspectRatio.m_meetOrSlice = SVG_MEETORSLICE_SLICE;
}
}
if (end != currParam && validate) {
bailOut:
// FIXME: Should the two values be set to UNKNOWN instead?
aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_NONE;
aspectRatio.m_meetOrSlice = SVG_MEETORSLICE_MEET;
} else
result = true;
return aspectRatio;
}
void SVGPreserveAspectRatio::transformRect(FloatRect& destRect, FloatRect& srcRect)
{
FloatSize imageSize = srcRect.size();
float origDestWidth = destRect.width();
float origDestHeight = destRect.height();
switch (m_meetOrSlice) {
case SVGPreserveAspectRatio::SVG_MEETORSLICE_UNKNOWN:
break;
case SVGPreserveAspectRatio::SVG_MEETORSLICE_MEET: {
float widthToHeightMultiplier = srcRect.height() / srcRect.width();
if (origDestHeight > origDestWidth * widthToHeightMultiplier) {
destRect.setHeight(origDestWidth * widthToHeightMultiplier);
switch (m_align) {
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
destRect.setY(destRect.y() + origDestHeight / 2 - destRect.height() / 2);
break;
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMAX:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
destRect.setY(destRect.y() + origDestHeight - destRect.height());
break;
default:
break;
}
}
if (origDestWidth > origDestHeight / widthToHeightMultiplier) {
destRect.setWidth(origDestHeight / widthToHeightMultiplier);
switch (m_align) {
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMIN:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
destRect.setX(destRect.x() + origDestWidth / 2 - destRect.width() / 2);
break;
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMIN:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
destRect.setX(destRect.x() + origDestWidth - destRect.width());
break;
default:
break;
}
}
break;
}
case SVGPreserveAspectRatio::SVG_MEETORSLICE_SLICE: {
float widthToHeightMultiplier = srcRect.height() / srcRect.width();
// if the destination height is less than the height of the image we'll be drawing
if (origDestHeight < origDestWidth * widthToHeightMultiplier) {
float destToSrcMultiplier = srcRect.width() / destRect.width();
srcRect.setHeight(destRect.height() * destToSrcMultiplier);
switch (m_align) {
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
srcRect.setY(destRect.y() + imageSize.height() / 2 - srcRect.height() / 2);
break;
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMAX:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
srcRect.setY(destRect.y() + imageSize.height() - srcRect.height());
break;
default:
break;
}
}
// if the destination width is less than the width of the image we'll be drawing
if (origDestWidth < origDestHeight / widthToHeightMultiplier) {
float destToSrcMultiplier = srcRect.height() / destRect.height();
srcRect.setWidth(destRect.width() * destToSrcMultiplier);
switch (m_align) {
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMIN:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
srcRect.setX(destRect.x() + imageSize.width() / 2 - srcRect.width() / 2);
break;
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMIN:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
srcRect.setX(destRect.x() + imageSize.width() - srcRect.width());
break;
default:
break;
}
}
break;
}
}
}
AffineTransform SVGPreserveAspectRatio::getCTM(float logicX, float logicY, float logicWidth, float logicHeight, float physWidth, float physHeight) const
{
AffineTransform transform;
if (m_align == SVG_PRESERVEASPECTRATIO_UNKNOWN)
return transform;
float logicalRatio = logicWidth / logicHeight;
float physRatio = physWidth / physHeight;
if (m_align == SVG_PRESERVEASPECTRATIO_NONE) {
transform.scaleNonUniform(physWidth / logicWidth, physHeight / logicHeight);
transform.translate(-logicX, -logicY);
return transform;
}
if ((logicalRatio < physRatio && (m_meetOrSlice == SVG_MEETORSLICE_MEET)) || (logicalRatio >= physRatio && (m_meetOrSlice == SVG_MEETORSLICE_SLICE))) {
transform.scaleNonUniform(physHeight / logicHeight, physHeight / logicHeight);
if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMINYMAX)
transform.translate(-logicX, -logicY);
else if (m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMAX)
transform.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight) / 2, -logicY);
else
transform.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight), -logicY);
return transform;
}
transform.scaleNonUniform(physWidth / logicWidth, physWidth / logicWidth);
if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMIN)
transform.translate(-logicX, -logicY);
else if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMID)
transform.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth) / 2);
else
transform.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth));
return transform;
}
String SVGPreserveAspectRatio::valueAsString() const
{
String alignType;
switch (m_align) {
case SVG_PRESERVEASPECTRATIO_NONE:
alignType = "none";
break;
case SVG_PRESERVEASPECTRATIO_XMINYMIN:
alignType = "xMinYMin";
break;
case SVG_PRESERVEASPECTRATIO_XMIDYMIN:
alignType = "xMidYMin";
break;
case SVG_PRESERVEASPECTRATIO_XMAXYMIN:
alignType = "xMaxYMin";
break;
case SVG_PRESERVEASPECTRATIO_XMINYMID:
alignType = "xMinYMid";
break;
case SVG_PRESERVEASPECTRATIO_XMIDYMID:
alignType = "xMidYMid";
break;
case SVG_PRESERVEASPECTRATIO_XMAXYMID:
alignType = "xMaxYMid";
break;
case SVG_PRESERVEASPECTRATIO_XMINYMAX:
alignType = "xMinYMax";
break;
case SVG_PRESERVEASPECTRATIO_XMIDYMAX:
alignType = "xMidYMax";
break;
case SVG_PRESERVEASPECTRATIO_XMAXYMAX:
alignType = "xMaxYMax";
break;
case SVG_PRESERVEASPECTRATIO_UNKNOWN:
alignType = "unknown";
break;
};
switch (m_meetOrSlice) {
default:
case SVG_MEETORSLICE_UNKNOWN:
return alignType;
case SVG_MEETORSLICE_MEET:
return makeString(alignType, " meet");
case SVG_MEETORSLICE_SLICE:
return makeString(alignType, " slice");
};
}
}
#endif // ENABLE(SVG)
|
