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
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
|
/*
* CSS Media Query Evaluator
*
* Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "MediaQueryEvaluator.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "CSSPrimitiveValue.h"
#include "CSSStyleSelector.h"
#include "CSSValueList.h"
#include "FloatRect.h"
#include "Frame.h"
#include "FrameView.h"
#include "IntRect.h"
#include "MediaFeatureNames.h"
#include "MediaList.h"
#include "MediaQuery.h"
#include "MediaQueryExp.h"
#include "NodeRenderStyle.h"
#include "Page.h"
#include "RenderView.h"
#include "RenderStyle.h"
#include "PlatformScreen.h"
#include <wtf/HashMap.h>
#if ENABLE(3D_RENDERING) && USE(ACCELERATED_COMPOSITING)
#include "RenderLayerCompositor.h"
#endif
namespace WebCore {
using namespace MediaFeatureNames;
enum MediaFeaturePrefix { MinPrefix, MaxPrefix, NoPrefix };
typedef bool (*EvalFunc)(CSSValue*, RenderStyle*, Frame*, MediaFeaturePrefix);
typedef HashMap<AtomicStringImpl*, EvalFunc> FunctionMap;
static FunctionMap* gFunctionMap;
/*
* FIXME: following media features are not implemented: color_index, scan, resolution
*
* color_index, min-color-index, max_color_index: It's unknown how to retrieve
* the information if the display mode is indexed
* scan: The "scan" media feature describes the scanning process of
* tv output devices. It's unknown how to retrieve this information from
* the platform
* resolution, min-resolution, max-resolution: css parser doesn't seem to
* support CSS_DIMENSION
*/
MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult)
: m_frame(0)
, m_style(0)
, m_expResult(mediaFeatureResult)
{
}
MediaQueryEvaluator:: MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult)
: m_mediaType(acceptedMediaType)
, m_frame(0)
, m_style(0)
, m_expResult(mediaFeatureResult)
{
}
MediaQueryEvaluator:: MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult)
: m_mediaType(acceptedMediaType)
, m_frame(0)
, m_style(0)
, m_expResult(mediaFeatureResult)
{
}
MediaQueryEvaluator:: MediaQueryEvaluator(const String& acceptedMediaType, Frame* frame, RenderStyle* style)
: m_mediaType(acceptedMediaType)
, m_frame(frame)
, m_style(style)
, m_expResult(false) // doesn't matter when we have m_frame and m_style
{
}
MediaQueryEvaluator::~MediaQueryEvaluator()
{
}
bool MediaQueryEvaluator::mediaTypeMatch(const String& mediaTypeToMatch) const
{
return mediaTypeToMatch.isEmpty()
|| equalIgnoringCase(mediaTypeToMatch, "all")
|| equalIgnoringCase(mediaTypeToMatch, m_mediaType);
}
bool MediaQueryEvaluator::mediaTypeMatchSpecific(const char* mediaTypeToMatch) const
{
// Like mediaTypeMatch, but without the special cases for "" and "all".
ASSERT(mediaTypeToMatch);
ASSERT(mediaTypeToMatch[0] != '\0');
ASSERT(!equalIgnoringCase(mediaTypeToMatch, String("all")));
return equalIgnoringCase(mediaTypeToMatch, m_mediaType);
}
static bool applyRestrictor(MediaQuery::Restrictor r, bool value)
{
return r == MediaQuery::Not ? !value : value;
}
bool MediaQueryEvaluator::eval(const MediaList* mediaList, CSSStyleSelector* styleSelector) const
{
if (!mediaList)
return true;
const Vector<MediaQuery*>& queries = mediaList->mediaQueries();
if (!queries.size())
return true; // empty query list evaluates to true
// iterate over queries, stop if any of them eval to true (OR semantics)
bool result = false;
for (size_t i = 0; i < queries.size() && !result; ++i) {
MediaQuery* query = queries.at(i);
if (query->ignored())
continue;
if (mediaTypeMatch(query->mediaType())) {
const Vector<OwnPtr<MediaQueryExp> >* exps = query->expressions();
// iterate through expressions, stop if any of them eval to false
// (AND semantics)
size_t j = 0;
for (; j < exps->size(); ++j) {
bool exprResult = eval(exps->at(j).get());
if (styleSelector && exps->at(j)->isViewportDependent())
styleSelector->addViewportDependentMediaQueryResult(exps->at(j).get(), exprResult);
if (!exprResult)
break;
}
// assume true if we are at the end of the list,
// otherwise assume false
result = applyRestrictor(query->restrictor(), exps->size() == j);
} else
result = applyRestrictor(query->restrictor(), false);
}
return result;
}
static bool parseAspectRatio(CSSValue* value, int& h, int& v)
{
if (value->isValueList()) {
CSSValueList* valueList = static_cast<CSSValueList*>(value);
if (valueList->length() == 3) {
CSSValue* i0 = valueList->itemWithoutBoundsCheck(0);
CSSValue* i1 = valueList->itemWithoutBoundsCheck(1);
CSSValue* i2 = valueList->itemWithoutBoundsCheck(2);
if (i0->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i0)->isNumber()
&& i1->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i1)->isString()
&& i2->isPrimitiveValue() && static_cast<CSSPrimitiveValue*>(i2)->isNumber()) {
String str = static_cast<CSSPrimitiveValue*>(i1)->getStringValue();
if (!str.isNull() && str.length() == 1 && str[0] == '/') {
h = static_cast<CSSPrimitiveValue*>(i0)->getIntValue(CSSPrimitiveValue::CSS_NUMBER);
v = static_cast<CSSPrimitiveValue*>(i2)->getIntValue(CSSPrimitiveValue::CSS_NUMBER);
return true;
}
}
}
}
return false;
}
template<typename T>
bool compareValue(T a, T b, MediaFeaturePrefix op)
{
switch (op) {
case MinPrefix:
return a >= b;
case MaxPrefix:
return a <= b;
case NoPrefix:
return a == b;
}
return false;
}
static bool numberValue(CSSValue* value, float& result)
{
if (value->isPrimitiveValue()
&& static_cast<CSSPrimitiveValue*>(value)->isNumber()) {
result = static_cast<CSSPrimitiveValue*>(value)->getFloatValue(CSSPrimitiveValue::CSS_NUMBER);
return true;
}
return false;
}
static bool colorMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
{
int bitsPerComponent = screenDepthPerComponent(frame->page()->mainFrame()->view());
float number;
if (value)
return numberValue(value, number) && compareValue(bitsPerComponent, static_cast<int>(number), op);
return bitsPerComponent != 0;
}
static bool monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix op)
{
if (!screenIsMonochrome(frame->page()->mainFrame()->view())) {
if (value) {
float number;
return numberValue(value, number) && compareValue(0, static_cast<int>(number), op);
}
return false;
}
return colorMediaFeatureEval(value, style, frame, op);
}
static bool orientationMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix)
{
// A missing parameter should fail
if (!value)
return false;
FrameView* view = frame->view();
int width = view->layoutWidth();
int height = view->layoutHeight();
if (width > height) // Square viewport is portrait
return "landscape" == static_cast<CSSPrimitiveValue*>(value)->getStringValue();
return "portrait" == static_cast<CSSPrimitiveValue*>(value)->getStringValue();
}
static bool aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
{
if (value) {
FrameView* view = frame->view();
int width = view->layoutWidth();
int height = view->layoutHeight();
int h = 0;
int v = 0;
if (parseAspectRatio(value, h, v))
return v != 0 && compareValue(width * v, height * h, op);
return false;
}
// ({,min-,max-}aspect-ratio)
// assume if we have a device, its aspect ratio is non-zero
return true;
}
static bool device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
{
if (value) {
FloatRect sg = screenRect(frame->page()->mainFrame()->view());
int h = 0;
int v = 0;
if (parseAspectRatio(value, h, v))
return v != 0 && compareValue(static_cast<int>(sg.width()) * v, static_cast<int>(sg.height()) * h, op);
return false;
}
// ({,min-,max-}device-aspect-ratio)
// assume if we have a device, its aspect ratio is non-zero
return true;
}
static bool device_pixel_ratioMediaFeatureEval(CSSValue *value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
{
if (value)
return value->isPrimitiveValue() && compareValue(frame->page()->deviceScaleFactor(), static_cast<CSSPrimitiveValue*>(value)->getFloatValue(), op);
return frame->page()->deviceScaleFactor() != 0;
}
static bool gridMediaFeatureEval(CSSValue* value, RenderStyle*, Frame*, MediaFeaturePrefix op)
{
// if output device is bitmap, grid: 0 == true
// assume we have bitmap device
float number;
if (value && numberValue(value, number))
return compareValue(static_cast<int>(number), 0, op);
return false;
}
static bool computeLength(CSSValue* value, bool strict, RenderStyle* style, RenderStyle* rootStyle, int& result)
{
if (!value->isPrimitiveValue())
return false;
CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value);
if (primitiveValue->isNumber()) {
result = primitiveValue->getIntValue();
return !strict || !result;
}
if (primitiveValue->isLength()) {
result = primitiveValue->computeLength<int>(style, rootStyle);
return true;
}
return false;
}
static bool device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix op)
{
if (value) {
FloatRect sg = screenRect(frame->page()->mainFrame()->view());
RenderStyle* rootStyle = frame->document()->documentElement()->renderStyle();
int length;
long height = sg.height();
InspectorInstrumentation::applyScreenHeightOverride(frame, &height);
return computeLength(value, !frame->document()->inQuirksMode(), style, rootStyle, length) && compareValue(static_cast<int>(height), length, op);
}
// ({,min-,max-}device-height)
// assume if we have a device, assume non-zero
return true;
}
static bool device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix op)
{
if (value) {
FloatRect sg = screenRect(frame->page()->mainFrame()->view());
RenderStyle* rootStyle = frame->document()->documentElement()->renderStyle();
int length;
long width = sg.width();
InspectorInstrumentation::applyScreenWidthOverride(frame, &width);
return computeLength(value, !frame->document()->inQuirksMode(), style, rootStyle, length) && compareValue(static_cast<int>(width), length, op);
}
// ({,min-,max-}device-width)
// assume if we have a device, assume non-zero
return true;
}
static bool heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix op)
{
FrameView* view = frame->view();
if (value) {
RenderStyle* rootStyle = frame->document()->documentElement()->renderStyle();
int length;
return computeLength(value, !frame->document()->inQuirksMode(), style, rootStyle, length) && compareValue(view->layoutHeight(), length, op);
}
return view->layoutHeight() != 0;
}
static bool widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix op)
{
FrameView* view = frame->view();
if (value) {
RenderStyle* rootStyle = frame->document()->documentElement()->renderStyle();
int length;
return computeLength(value, !frame->document()->inQuirksMode(), style, rootStyle, length) && compareValue(view->layoutWidth(), length, op);
}
return view->layoutWidth() != 0;
}
// rest of the functions are trampolines which set the prefix according to the media feature expression used
static bool min_colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return colorMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_colorMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return colorMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return monochromeMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_monochromeMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return monochromeMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return aspect_ratioMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return aspect_ratioMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_aspect_ratioMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_device_aspect_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_aspect_ratioMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_device_pixel_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_pixel_ratioMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_device_pixel_ratioMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_pixel_ratioMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return heightMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return heightMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return widthMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return widthMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_heightMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_device_heightMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_heightMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool min_device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_widthMediaFeatureEval(value, style, frame, MinPrefix);
}
static bool max_device_widthMediaFeatureEval(CSSValue* value, RenderStyle* style, Frame* frame, MediaFeaturePrefix)
{
return device_widthMediaFeatureEval(value, style, frame, MaxPrefix);
}
static bool animationMediaFeatureEval(CSSValue* value, RenderStyle*, Frame*, MediaFeaturePrefix op)
{
if (value) {
float number;
return numberValue(value, number) && compareValue(1, static_cast<int>(number), op);
}
return true;
}
static bool transitionMediaFeatureEval(CSSValue* value, RenderStyle*, Frame*, MediaFeaturePrefix op)
{
if (value) {
float number;
return numberValue(value, number) && compareValue(1, static_cast<int>(number), op);
}
return true;
}
static bool transform_2dMediaFeatureEval(CSSValue* value, RenderStyle*, Frame*, MediaFeaturePrefix op)
{
if (value) {
float number;
return numberValue(value, number) && compareValue(1, static_cast<int>(number), op);
}
return true;
}
static bool transform_3dMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
{
bool returnValueIfNoParameter;
int have3dRendering;
#if ENABLE(3D_RENDERING)
bool threeDEnabled = false;
#if USE(ACCELERATED_COMPOSITING)
if (RenderView* view = frame->contentRenderer())
threeDEnabled = view->compositor()->canRender3DTransforms();
#endif
returnValueIfNoParameter = threeDEnabled;
have3dRendering = threeDEnabled ? 1 : 0;
#else
UNUSED_PARAM(frame);
returnValueIfNoParameter = false;
have3dRendering = 0;
#endif
if (value) {
float number;
return numberValue(value, number) && compareValue(have3dRendering, static_cast<int>(number), op);
}
return returnValueIfNoParameter;
}
static bool view_modeMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
{
UNUSED_PARAM(op);
if (!value)
return true;
return Page::stringToViewMode(static_cast<CSSPrimitiveValue*>(value)->getStringValue()) == frame->page()->viewMode();
}
static void createFunctionMap()
{
// Create the table.
gFunctionMap = new FunctionMap;
#define ADD_TO_FUNCTIONMAP(name, str) \
gFunctionMap->set(name##MediaFeature.impl(), name##MediaFeatureEval);
CSS_MEDIAQUERY_NAMES_FOR_EACH_MEDIAFEATURE(ADD_TO_FUNCTIONMAP);
#undef ADD_TO_FUNCTIONMAP
}
bool MediaQueryEvaluator::eval(const MediaQueryExp* expr) const
{
if (!m_frame || !m_style)
return m_expResult;
if (!expr->isValid())
return false;
if (!gFunctionMap)
createFunctionMap();
// call the media feature evaluation function. Assume no prefix
// and let trampoline functions override the prefix if prefix is
// used
EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl());
if (func)
return func(expr->value(), m_style.get(), m_frame, NoPrefix);
return false;
}
} // namespace
|