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
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
|
/*
* Copyright 2006, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 "GraphicsContext.h"
#include "AffineTransform.h"
#include "Gradient.h"
#include "GraphicsContextPrivate.h"
#include "NotImplemented.h"
#include "Path.h"
#include "Pattern.h"
#include "PlatformGraphicsContext.h"
#include "SkBitmapRef.h"
#include "SkBlurDrawLooper.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkDashPathEffect.h"
#include "SkDevice.h"
#include "SkGradientShader.h"
#include "SkPaint.h"
#include "SkString.h"
#include "SkiaUtils.h"
#include "TransformationMatrix.h"
#include "android_graphics.h"
using namespace std;
#define GC2Canvas(ctx) (ctx)->m_data->mPgc->mCanvas
namespace WebCore {
static int RoundToInt(float x)
{
return (int)roundf(x);
}
template <typename T> T* deepCopyPtr(const T* src) {
return src ? new T(*src) : NULL;
}
/* TODO / questions
mAlpha: how does this interact with the alpha in Color? multiply them together?
mMode: do I always respect this? If so, then
the rgb() & 0xFF000000 check will abort drawing too often
Is Color premultiplied or not? If it is, then I can't blindly pass it to paint.setColor()
*/
struct ShadowRec {
SkScalar mBlur; // >0 means valid shadow
SkScalar mDx;
SkScalar mDy;
SkColor mColor;
};
class GraphicsContextPlatformPrivate {
public:
GraphicsContext* mCG; // back-ptr to our parent
PlatformGraphicsContext* mPgc;
struct State {
SkPath* mPath;
SkPathEffect* mPathEffect;
float mMiterLimit;
float mAlpha;
float mStrokeThickness;
SkPaint::Cap mLineCap;
SkPaint::Join mLineJoin;
SkXfermode::Mode mMode;
int mDashRatio; //ratio of the length of a dash to its width
ShadowRec mShadow;
SkColor mFillColor;
SkColor mStrokeColor;
bool mUseAA;
State() {
mPath = NULL; // lazily allocated
mPathEffect = 0;
mMiterLimit = 4;
mAlpha = 1;
mStrokeThickness = 0.0f; // Same as default in GraphicsContextPrivate.h
mLineCap = SkPaint::kDefault_Cap;
mLineJoin = SkPaint::kDefault_Join;
mMode = SkXfermode::kSrcOver_Mode;
mDashRatio = 3;
mUseAA = true;
mShadow.mBlur = 0;
mFillColor = SK_ColorBLACK;
mStrokeColor = SK_ColorBLACK;
}
State(const State& other) {
memcpy(this, &other, sizeof(State));
mPath = deepCopyPtr<SkPath>(other.mPath);
mPathEffect->safeRef();
}
~State() {
delete mPath;
mPathEffect->safeUnref();
}
void setShadow(int radius, int dx, int dy, SkColor c) {
// cut the radius in half, to visually match the effect seen in
// safari browser
mShadow.mBlur = SkScalarHalf(SkIntToScalar(radius));
mShadow.mDx = SkIntToScalar(dx);
mShadow.mDy = SkIntToScalar(dy);
mShadow.mColor = c;
}
bool setupShadowPaint(SkPaint* paint, SkPoint* offset) {
if (mShadow.mBlur > 0) {
paint->setAntiAlias(true);
paint->setDither(true);
paint->setXfermodeMode(mMode);
paint->setColor(mShadow.mColor);
paint->setMaskFilter(SkBlurMaskFilter::Create(mShadow.mBlur,
SkBlurMaskFilter::kNormal_BlurStyle))->unref();
offset->set(mShadow.mDx, mShadow.mDy);
return true;
}
return false;
}
SkColor applyAlpha(SkColor c) const
{
int s = RoundToInt(mAlpha * 256);
if (s >= 256)
return c;
if (s < 0)
return 0;
int a = SkAlphaMul(SkColorGetA(c), s);
return (c & 0x00FFFFFF) | (a << 24);
}
};
SkDeque mStateStack;
State* mState;
GraphicsContextPlatformPrivate(GraphicsContext* cg, PlatformGraphicsContext* pgc)
: mCG(cg)
, mPgc(pgc), mStateStack(sizeof(State)) {
State* state = (State*)mStateStack.push_back();
new (state) State();
mState = state;
}
~GraphicsContextPlatformPrivate() {
if (mPgc && mPgc->deleteUs())
delete mPgc;
// we force restores so we don't leak any subobjects owned by our
// stack of State records.
while (mStateStack.count() > 0)
this->restore();
}
void save() {
State* newState = (State*)mStateStack.push_back();
new (newState) State(*mState);
mState = newState;
}
void restore() {
mState->~State();
mStateStack.pop_back();
mState = (State*)mStateStack.back();
}
void setFillColor(const Color& c) {
mState->mFillColor = c.rgb();
}
void setStrokeColor(const Color& c) {
mState->mStrokeColor = c.rgb();
}
void setStrokeThickness(float f) {
mState->mStrokeThickness = f;
}
void beginPath() {
if (mState->mPath) {
mState->mPath->reset();
}
}
void addPath(const SkPath& other) {
if (!mState->mPath) {
mState->mPath = new SkPath(other);
} else {
mState->mPath->addPath(other);
}
}
// may return null
SkPath* getPath() const { return mState->mPath; }
void setup_paint_common(SkPaint* paint) const {
paint->setAntiAlias(mState->mUseAA);
paint->setDither(true);
paint->setXfermodeMode(mState->mMode);
if (mState->mShadow.mBlur > 0) {
SkDrawLooper* looper = new SkBlurDrawLooper(mState->mShadow.mBlur,
mState->mShadow.mDx,
mState->mShadow.mDy,
mState->mShadow.mColor);
paint->setLooper(looper)->unref();
}
/* need to sniff textDrawingMode(), which returns the bit_OR of...
const int cTextInvisible = 0;
const int cTextFill = 1;
const int cTextStroke = 2;
const int cTextClip = 4;
*/
}
void setup_paint_fill(SkPaint* paint) const {
this->setup_paint_common(paint);
paint->setColor(mState->applyAlpha(mState->mFillColor));
}
void setup_paint_bitmap(SkPaint* paint) const {
this->setup_paint_common(paint);
// we only want the global alpha for bitmaps,
// so just give applyAlpha opaque black
paint->setColor(mState->applyAlpha(0xFF000000));
}
/* sets up the paint for stroking. Returns true if the style is really
just a dash of squares (the size of the paint's stroke-width.
*/
bool setup_paint_stroke(SkPaint* paint, SkRect* rect) {
this->setup_paint_common(paint);
paint->setColor(mState->applyAlpha(mState->mStrokeColor));
float width = mState->mStrokeThickness;
// this allows dashing and dotting to work properly for hairline strokes
// FIXME: Should we only do this for dashed and dotted strokes?
if (0 == width) {
width = 1;
}
// paint->setColor(mState->applyAlpha(mCG->strokeColor().rgb()));
paint->setStyle(SkPaint::kStroke_Style);
paint->setStrokeWidth(SkFloatToScalar(width));
paint->setStrokeCap(mState->mLineCap);
paint->setStrokeJoin(mState->mLineJoin);
paint->setStrokeMiter(SkFloatToScalar(mState->mMiterLimit));
if (rect != NULL && (RoundToInt(width) & 1)) {
rect->inset(-SK_ScalarHalf, -SK_ScalarHalf);
}
SkPathEffect* pe = mState->mPathEffect;
if (pe) {
paint->setPathEffect(pe);
return false;
}
switch (mCG->strokeStyle()) {
case NoStroke:
case SolidStroke:
width = 0;
break;
case DashedStroke:
width = mState->mDashRatio * width;
break;
/* no break */
case DottedStroke:
break;
}
if (width > 0) {
SkScalar intervals[] = { width, width };
pe = new SkDashPathEffect(intervals, 2, 0);
paint->setPathEffect(pe)->unref();
// return true if we're basically a dotted dash of squares
return RoundToInt(width) == RoundToInt(paint->getStrokeWidth());
}
return false;
}
private:
// not supported yet
State& operator=(const State&);
};
static SkShader::TileMode SpreadMethod2TileMode(GradientSpreadMethod sm) {
SkShader::TileMode mode = SkShader::kClamp_TileMode;
switch (sm) {
case SpreadMethodPad:
mode = SkShader::kClamp_TileMode;
break;
case SpreadMethodReflect:
mode = SkShader::kMirror_TileMode;
break;
case SpreadMethodRepeat:
mode = SkShader::kRepeat_TileMode;
break;
}
return mode;
}
static void extactShader(SkPaint* paint, Pattern* pat, Gradient* grad)
{
if (pat) {
// platformPattern() returns a cached obj
paint->setShader(pat->platformPattern(AffineTransform()));
} else if (grad) {
// grad->getShader() returns a cached obj
GradientSpreadMethod sm = grad->spreadMethod();
paint->setShader(grad->getShader(SpreadMethod2TileMode(sm)));
}
}
////////////////////////////////////////////////////////////////////////////////////////////////
GraphicsContext* GraphicsContext::createOffscreenContext(int width, int height)
{
PlatformGraphicsContext* pgc = new PlatformGraphicsContext();
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
bitmap.allocPixels();
bitmap.eraseColor(0);
pgc->mCanvas->setBitmapDevice(bitmap);
GraphicsContext* ctx = new GraphicsContext(pgc);
//printf("-------- create offscreen <canvas> %p\n", ctx);
return ctx;
}
////////////////////////////////////////////////////////////////////////////////////////////////
GraphicsContext::GraphicsContext(PlatformGraphicsContext *gc)
: m_common(createGraphicsContextPrivate())
, m_data(new GraphicsContextPlatformPrivate(this, gc))
{
setPaintingDisabled(NULL == gc || NULL == gc->mCanvas);
}
GraphicsContext::~GraphicsContext()
{
delete m_data;
this->destroyGraphicsContextPrivate(m_common);
}
void GraphicsContext::savePlatformState()
{
// save our private State
m_data->save();
// save our native canvas
GC2Canvas(this)->save();
}
void GraphicsContext::restorePlatformState()
{
// restore our native canvas
GC2Canvas(this)->restore();
// restore our private State
m_data->restore();
}
bool GraphicsContext::willFill() const {
return m_data->mState->mFillColor != 0;
}
bool GraphicsContext::willStroke() const {
return m_data->mState->mStrokeColor != 0;
}
const SkPath* GraphicsContext::getCurrPath() const {
return m_data->mState->mPath;
}
// Draws a filled rectangle with a stroked border.
void GraphicsContext::drawRect(const IntRect& rect)
{
if (paintingDisabled())
return;
SkPaint paint;
SkRect r(rect);
if (fillColor().alpha()) {
m_data->setup_paint_fill(&paint);
GC2Canvas(this)->drawRect(r, paint);
}
/* According to GraphicsContext.h, stroking inside drawRect always means
a stroke of 1 inside the rect.
*/
if (strokeStyle() != NoStroke && strokeColor().alpha()) {
paint.reset();
m_data->setup_paint_stroke(&paint, &r);
paint.setPathEffect(NULL); // no dashing please
paint.setStrokeWidth(SK_Scalar1); // always just 1.0 width
r.inset(SK_ScalarHalf, SK_ScalarHalf); // ensure we're "inside"
GC2Canvas(this)->drawRect(r, paint);
}
}
// This is only used to draw borders.
void GraphicsContext::drawLine(const IntPoint& point1, const IntPoint& point2)
{
if (paintingDisabled())
return;
StrokeStyle style = strokeStyle();
if (style == NoStroke)
return;
SkPaint paint;
SkCanvas* canvas = GC2Canvas(this);
const int idx = SkAbs32(point2.x() - point1.x());
const int idy = SkAbs32(point2.y() - point1.y());
// special-case horizontal and vertical lines that are really just dots
if (m_data->setup_paint_stroke(&paint, NULL) && (0 == idx || 0 == idy)) {
const SkScalar diameter = paint.getStrokeWidth();
const SkScalar radius = SkScalarHalf(diameter);
SkScalar x = SkIntToScalar(SkMin32(point1.x(), point2.x()));
SkScalar y = SkIntToScalar(SkMin32(point1.y(), point2.y()));
SkScalar dx, dy;
int count;
SkRect bounds;
if (0 == idy) { // horizontal
bounds.set(x, y - radius, x + SkIntToScalar(idx), y + radius);
x += radius;
dx = diameter * 2;
dy = 0;
count = idx;
} else { // vertical
bounds.set(x - radius, y, x + radius, y + SkIntToScalar(idy));
y += radius;
dx = 0;
dy = diameter * 2;
count = idy;
}
// the actual count is the number of ONs we hit alternating
// ON(diameter), OFF(diameter), ...
{
SkScalar width = SkScalarDiv(SkIntToScalar(count), diameter);
// now computer the number of cells (ON and OFF)
count = SkScalarRound(width);
// now compute the number of ONs
count = (count + 1) >> 1;
}
SkAutoMalloc storage(count * sizeof(SkPoint));
SkPoint* verts = (SkPoint*)storage.get();
// now build the array of vertices to past to drawPoints
for (int i = 0; i < count; i++) {
verts[i].set(x, y);
x += dx;
y += dy;
}
paint.setStyle(SkPaint::kFill_Style);
paint.setPathEffect(NULL);
// clipping to bounds is not required for correctness, but it does
// allow us to reject the entire array of points if we are completely
// offscreen. This is common in a webpage for android, where most of
// the content is clipped out. If drawPoints took an (optional) bounds
// parameter, that might even be better, as we would *just* use it for
// culling, and not both wacking the canvas' save/restore stack.
canvas->save(SkCanvas::kClip_SaveFlag);
canvas->clipRect(bounds);
canvas->drawPoints(SkCanvas::kPoints_PointMode, count, verts, paint);
canvas->restore();
} else {
SkPoint pts[2] = { point1, point2 };
canvas->drawLine(pts[0].fX, pts[0].fY, pts[1].fX, pts[1].fY, paint);
}
}
static void setrect_for_underline(SkRect* r, GraphicsContext* context, const IntPoint& point, int yOffset, int width)
{
float lineThickness = context->strokeThickness();
// if (lineThickness < 1) // do we really need/want this?
// lineThickness = 1;
yOffset += 1; // we add 1 to have underlines appear below the text
r->fLeft = SkIntToScalar(point.x());
r->fTop = SkIntToScalar(point.y() + yOffset);
r->fRight = r->fLeft + SkIntToScalar(width);
r->fBottom = r->fTop + SkFloatToScalar(lineThickness);
}
void GraphicsContext::drawLineForText(IntPoint const& pt, int width, bool)
{
if (paintingDisabled())
return;
SkRect r;
setrect_for_underline(&r, this, pt, 0, width);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(this->strokeColor().rgb());
GC2Canvas(this)->drawRect(r, paint);
}
// TODO: Should we draw different based on TextCheckingLineStyle?
void GraphicsContext::drawLineForTextChecking(const IntPoint& pt, int width, TextCheckingLineStyle)
{
if (paintingDisabled())
return;
SkRect r;
setrect_for_underline(&r, this, pt, 0, width);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorRED); // is this specified somewhere?
GC2Canvas(this)->drawRect(r, paint);
}
// This method is only used to draw the little circles used in lists.
void GraphicsContext::drawEllipse(const IntRect& rect)
{
if (paintingDisabled())
return;
SkPaint paint;
SkRect oval(rect);
if (fillColor().rgb() & 0xFF000000) {
m_data->setup_paint_fill(&paint);
GC2Canvas(this)->drawOval(oval, paint);
}
if (strokeStyle() != NoStroke) {
paint.reset();
m_data->setup_paint_stroke(&paint, &oval);
GC2Canvas(this)->drawOval(oval, paint);
}
}
static inline int fast_mod(int value, int max)
{
int sign = SkExtractSign(value);
value = SkApplySign(value, sign);
if (value >= max) {
value %= max;
}
return SkApplySign(value, sign);
}
void GraphicsContext::strokeArc(const IntRect& r, int startAngle, int angleSpan)
{
if (paintingDisabled())
return;
SkPath path;
SkPaint paint;
SkRect oval(r);
if (strokeStyle() == NoStroke) {
m_data->setup_paint_fill(&paint); // we want the fill color
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkFloatToScalar(this->strokeThickness()));
}
else {
m_data->setup_paint_stroke(&paint, NULL);
}
// we do this before converting to scalar, so we don't overflow SkFixed
startAngle = fast_mod(startAngle, 360);
angleSpan = fast_mod(angleSpan, 360);
path.addArc(oval, SkIntToScalar(-startAngle), SkIntToScalar(-angleSpan));
GC2Canvas(this)->drawPath(path, paint);
}
void GraphicsContext::drawConvexPolygon(size_t numPoints, const FloatPoint* points, bool shouldAntialias)
{
if (paintingDisabled())
return;
if (numPoints <= 1)
return;
SkPaint paint;
SkPath path;
path.incReserve(numPoints);
path.moveTo(SkFloatToScalar(points[0].x()), SkFloatToScalar(points[0].y()));
for (size_t i = 1; i < numPoints; i++)
path.lineTo(SkFloatToScalar(points[i].x()), SkFloatToScalar(points[i].y()));
if (GC2Canvas(this)->quickReject(path, shouldAntialias ?
SkCanvas::kAA_EdgeType : SkCanvas::kBW_EdgeType)) {
return;
}
if (fillColor().rgb() & 0xFF000000) {
m_data->setup_paint_fill(&paint);
paint.setAntiAlias(shouldAntialias);
GC2Canvas(this)->drawPath(path, paint);
}
if (strokeStyle() != NoStroke) {
paint.reset();
m_data->setup_paint_stroke(&paint, NULL);
paint.setAntiAlias(shouldAntialias);
GC2Canvas(this)->drawPath(path, paint);
}
}
void GraphicsContext::fillRoundedRect(const IntRect& rect, const IntSize& topLeft, const IntSize& topRight,
const IntSize& bottomLeft, const IntSize& bottomRight, const Color& color, ColorSpace)
{
if (paintingDisabled())
return;
SkPaint paint;
SkPath path;
SkScalar radii[8];
radii[0] = SkIntToScalar(topLeft.width());
radii[1] = SkIntToScalar(topLeft.height());
radii[2] = SkIntToScalar(topRight.width());
radii[3] = SkIntToScalar(topRight.height());
radii[4] = SkIntToScalar(bottomRight.width());
radii[5] = SkIntToScalar(bottomRight.height());
radii[6] = SkIntToScalar(bottomLeft.width());
radii[7] = SkIntToScalar(bottomLeft.height());
path.addRoundRect(rect, radii);
m_data->setup_paint_fill(&paint);
GC2Canvas(this)->drawPath(path, paint);
}
void GraphicsContext::fillRect(const FloatRect& rect)
{
SkPaint paint;
m_data->setup_paint_fill(&paint);
extactShader(&paint,
m_common->state.fillPattern.get(),
m_common->state.fillGradient.get());
GC2Canvas(this)->drawRect(rect, paint);
}
void GraphicsContext::fillRect(const FloatRect& rect, const Color& color, ColorSpace)
{
if (paintingDisabled())
return;
if (color.rgb() & 0xFF000000) {
SkPaint paint;
m_data->setup_paint_common(&paint);
paint.setColor(color.rgb()); // punch in the specified color
paint.setShader(NULL); // in case we had one set
/* Sometimes we record and draw portions of the page, using clips
for each portion. The problem with this is that webkit, sometimes,
sees that we're only recording a portion, and they adjust some of
their rectangle coordinates accordingly (e.g.
RenderBoxModelObject::paintFillLayerExtended() which calls
rect.intersect(paintInfo.rect) and then draws the bg with that
rect. The result is that we end up drawing rects that are meant to
seam together (one for each portion), but if the rects have
fractional coordinates (e.g. we are zoomed by a fractional amount)
we will double-draw those edges, resulting in visual cracks or
artifacts.
The fix seems to be to just turn off antialasing for rects (this
entry-point in GraphicsContext seems to have been sufficient,
though perhaps we'll find we need to do this as well in fillRect(r)
as well.) Currently setup_paint_common() enables antialiasing.
Since we never show the page rotated at a funny angle, disabling
antialiasing seems to have no real down-side, and it does fix the
bug when we're zoomed (and drawing portions that need to seam).
*/
paint.setAntiAlias(false);
GC2Canvas(this)->drawRect(rect, paint);
}
}
void GraphicsContext::clip(const FloatRect& rect)
{
if (paintingDisabled())
return;
GC2Canvas(this)->clipRect(rect);
}
void GraphicsContext::clip(const Path& path)
{
if (paintingDisabled())
return;
// path.platformPath()->dump(false, "clip path");
GC2Canvas(this)->clipPath(*path.platformPath());
}
void GraphicsContext::addInnerRoundedRectClip(const IntRect& rect, int thickness)
{
if (paintingDisabled())
return;
//printf("-------- addInnerRoundedRectClip: [%d %d %d %d] thickness=%d\n", rect.x(), rect.y(), rect.width(), rect.height(), thickness);
SkPath path;
SkRect r(rect);
path.addOval(r, SkPath::kCW_Direction);
// only perform the inset if we won't invert r
if (2*thickness < rect.width() && 2*thickness < rect.height())
{
r.inset(SkIntToScalar(thickness) ,SkIntToScalar(thickness));
path.addOval(r, SkPath::kCCW_Direction);
}
GC2Canvas(this)->clipPath(path);
}
void GraphicsContext::canvasClip(const Path& path)
{
clip(path);
}
void GraphicsContext::clipOut(const IntRect& r)
{
if (paintingDisabled())
return;
GC2Canvas(this)->clipRect(r, SkRegion::kDifference_Op);
}
void GraphicsContext::clipOutEllipseInRect(const IntRect& r)
{
if (paintingDisabled())
return;
SkPath path;
path.addOval(r, SkPath::kCCW_Direction);
GC2Canvas(this)->clipPath(path, SkRegion::kDifference_Op);
}
#if ENABLE(SVG)
void GraphicsContext::clipPath(WindRule clipRule)
{
if (paintingDisabled())
return;
const SkPath* oldPath = m_data->getPath();
SkPath path(*oldPath);
path.setFillType(clipRule == RULE_EVENODD ? SkPath::kEvenOdd_FillType : SkPath::kWinding_FillType);
GC2Canvas(this)->clipPath(path);
}
#endif
void GraphicsContext::clipOut(const Path& p)
{
if (paintingDisabled())
return;
GC2Canvas(this)->clipPath(*p.platformPath(), SkRegion::kDifference_Op);
}
//////////////////////////////////////////////////////////////////////////////////////////////////
#if SVG_SUPPORT
KRenderingDeviceContext* GraphicsContext::createRenderingDeviceContext()
{
return new KRenderingDeviceContextQuartz(platformContext());
}
#endif
/* These are the flags we need when we call saveLayer for transparency.
Since it does not appear that webkit intends this to also save/restore
the matrix or clip, I do not give those flags (for performance)
*/
#define TRANSPARENCY_SAVEFLAGS \
(SkCanvas::SaveFlags)(SkCanvas::kHasAlphaLayer_SaveFlag | \
SkCanvas::kFullColorLayer_SaveFlag)
void GraphicsContext::beginTransparencyLayer(float opacity)
{
if (paintingDisabled())
return;
SkCanvas* canvas = GC2Canvas(this);
canvas->saveLayerAlpha(NULL, (int)(opacity * 255), TRANSPARENCY_SAVEFLAGS);
}
void GraphicsContext::endTransparencyLayer()
{
if (paintingDisabled())
return;
GC2Canvas(this)->restore();
}
///////////////////////////////////////////////////////////////////////////
void GraphicsContext::setupBitmapPaint(SkPaint* paint) {
m_data->setup_paint_bitmap(paint);
}
void GraphicsContext::setupFillPaint(SkPaint* paint) {
m_data->setup_paint_fill(paint);
}
void GraphicsContext::setupStrokePaint(SkPaint* paint) {
m_data->setup_paint_stroke(paint, NULL);
}
bool GraphicsContext::setupShadowPaint(SkPaint* paint, SkPoint* offset) {
return m_data->mState->setupShadowPaint(paint, offset);
}
void GraphicsContext::setPlatformStrokeColor(const Color& c, ColorSpace) {
m_data->setStrokeColor(c);
}
void GraphicsContext::setPlatformStrokeThickness(float f) {
m_data->setStrokeThickness(f);
}
void GraphicsContext::setPlatformFillColor(const Color& c, ColorSpace) {
m_data->setFillColor(c);
}
void GraphicsContext::setPlatformShadow(const FloatSize& size, float blur, const Color& color, ColorSpace)
{
if (paintingDisabled())
return;
if (blur <= 0) {
this->clearPlatformShadow();
}
SkColor c;
if (color.isValid()) {
c = color.rgb();
} else {
c = SkColorSetARGB(0xFF/3, 0, 0, 0); // "std" Apple shadow color
}
m_data->mState->setShadow(blur, size.width(), size.height(), c);
}
void GraphicsContext::clearPlatformShadow()
{
if (paintingDisabled())
return;
m_data->mState->setShadow(0, 0, 0, 0);
}
///////////////////////////////////////////////////////////////////////////////
void GraphicsContext::drawFocusRing(const Vector<IntRect>&, int, int, const Color&)
{
// Do nothing, since we draw the focus ring independently.
}
void GraphicsContext::drawFocusRing(const Vector<Path>&, int, int, const Color&)
{
// Do nothing, since we draw the focus ring independently.
}
PlatformGraphicsContext* GraphicsContext::platformContext() const
{
ASSERT(!paintingDisabled());
return m_data->mPgc;
}
void GraphicsContext::setMiterLimit(float limit)
{
m_data->mState->mMiterLimit = limit;
}
void GraphicsContext::setAlpha(float alpha)
{
m_data->mState->mAlpha = alpha;
}
void GraphicsContext::setCompositeOperation(CompositeOperator op)
{
m_data->mState->mMode = WebCoreCompositeToSkiaComposite(op);
}
void GraphicsContext::clearRect(const FloatRect& rect)
{
if (paintingDisabled())
return;
SkPaint paint;
m_data->setup_paint_fill(&paint);
paint.setXfermodeMode(SkXfermode::kClear_Mode);
GC2Canvas(this)->drawRect(rect, paint);
}
void GraphicsContext::strokeRect(const FloatRect& rect, float lineWidth)
{
if (paintingDisabled())
return;
SkPaint paint;
m_data->setup_paint_stroke(&paint, NULL);
paint.setStrokeWidth(SkFloatToScalar(lineWidth));
GC2Canvas(this)->drawRect(rect, paint);
}
void GraphicsContext::setLineCap(LineCap cap)
{
switch (cap) {
case ButtCap:
m_data->mState->mLineCap = SkPaint::kButt_Cap;
break;
case RoundCap:
m_data->mState->mLineCap = SkPaint::kRound_Cap;
break;
case SquareCap:
m_data->mState->mLineCap = SkPaint::kSquare_Cap;
break;
default:
SkDEBUGF(("GraphicsContext::setLineCap: unknown LineCap %d\n", cap));
break;
}
}
#if ENABLE(SVG)
void GraphicsContext::setLineDash(const DashArray& dashes, float dashOffset)
{
if (paintingDisabled())
return;
size_t dashLength = dashes.size();
if (!dashLength)
return;
size_t count = (dashLength % 2) == 0 ? dashLength : dashLength * 2;
SkScalar* intervals = new SkScalar[count];
for (unsigned int i = 0; i < count; i++)
intervals[i] = SkFloatToScalar(dashes[i % dashLength]);
SkPathEffect **effectPtr = &m_data->mState->mPathEffect;
(*effectPtr)->safeUnref();
*effectPtr = new SkDashPathEffect(intervals, count, SkFloatToScalar(dashOffset));
delete[] intervals;
}
#endif
void GraphicsContext::setLineJoin(LineJoin join)
{
switch (join) {
case MiterJoin:
m_data->mState->mLineJoin = SkPaint::kMiter_Join;
break;
case RoundJoin:
m_data->mState->mLineJoin = SkPaint::kRound_Join;
break;
case BevelJoin:
m_data->mState->mLineJoin = SkPaint::kBevel_Join;
break;
default:
SkDEBUGF(("GraphicsContext::setLineJoin: unknown LineJoin %d\n", join));
break;
}
}
void GraphicsContext::scale(const FloatSize& size)
{
if (paintingDisabled())
return;
GC2Canvas(this)->scale(SkFloatToScalar(size.width()), SkFloatToScalar(size.height()));
}
void GraphicsContext::rotate(float angleInRadians)
{
if (paintingDisabled())
return;
GC2Canvas(this)->rotate(SkFloatToScalar(angleInRadians * (180.0f / 3.14159265f)));
}
void GraphicsContext::translate(float x, float y)
{
if (paintingDisabled())
return;
GC2Canvas(this)->translate(SkFloatToScalar(x), SkFloatToScalar(y));
}
void GraphicsContext::concatCTM(const AffineTransform& affine)
{
if (paintingDisabled())
return;
GC2Canvas(this)->concat(affine);
}
/* This is intended to round the rect to device pixels (through the CTM)
and then invert the result back into source space, with the hope that when
it is drawn (through the matrix), it will land in the "right" place (i.e.
on pixel boundaries).
For android, we record this geometry once and then draw it though various
scale factors as the user zooms, without re-recording. Thus this routine
should just leave the original geometry alone.
If we instead draw into bitmap tiles, we should then perform this
transform -> round -> inverse step.
*/
FloatRect GraphicsContext::roundToDevicePixels(const FloatRect& rect)
{
return rect;
}
//////////////////////////////////////////////////////////////////////////////////////////////////
void GraphicsContext::setURLForRect(const KURL& link, const IntRect& destRect)
{
// appears to be PDF specific, so we ignore it
#if 0
if (paintingDisabled())
return;
CFURLRef urlRef = link.createCFURL();
if (urlRef) {
CGContextRef context = platformContext();
// Get the bounding box to handle clipping.
CGRect box = CGContextGetClipBoundingBox(context);
IntRect intBox((int)box.origin.x, (int)box.origin.y, (int)box.size.width, (int)box.size.height);
IntRect rect = destRect;
rect.intersect(intBox);
CGPDFContextSetURLForRect(context, urlRef,
CGRectApplyAffineTransform(rect, CGContextGetCTM(context)));
CFRelease(urlRef);
}
#endif
}
void GraphicsContext::setPlatformShouldAntialias(bool useAA)
{
if (paintingDisabled())
return;
m_data->mState->mUseAA = useAA;
}
AffineTransform GraphicsContext::getCTM() const
{
const SkMatrix& m = GC2Canvas(this)->getTotalMatrix();
return AffineTransform(SkScalarToDouble(m.getScaleX()), // a
SkScalarToDouble(m.getSkewY()), // b
SkScalarToDouble(m.getSkewX()), // c
SkScalarToDouble(m.getScaleY()), // d
SkScalarToDouble(m.getTranslateX()), // e
SkScalarToDouble(m.getTranslateY())); // f
}
///////////////////////////////////////////////////////////////////////////////
void GraphicsContext::beginPath()
{
m_data->beginPath();
}
void GraphicsContext::addPath(const Path& p)
{
m_data->addPath(*p.platformPath());
}
void GraphicsContext::fillPath()
{
SkPath* path = m_data->getPath();
if (paintingDisabled() || !path)
return;
switch (this->fillRule()) {
case RULE_NONZERO:
path->setFillType(SkPath::kWinding_FillType);
break;
case RULE_EVENODD:
path->setFillType(SkPath::kEvenOdd_FillType);
break;
}
SkPaint paint;
m_data->setup_paint_fill(&paint);
extactShader(&paint,
m_common->state.fillPattern.get(),
m_common->state.fillGradient.get());
GC2Canvas(this)->drawPath(*path, paint);
}
void GraphicsContext::strokePath()
{
const SkPath* path = m_data->getPath();
if (paintingDisabled() || !path)
return;
SkPaint paint;
m_data->setup_paint_stroke(&paint, NULL);
extactShader(&paint,
m_common->state.strokePattern.get(),
m_common->state.strokeGradient.get());
GC2Canvas(this)->drawPath(*path, paint);
}
void GraphicsContext::setImageInterpolationQuality(InterpolationQuality mode)
{
/*
enum InterpolationQuality {
InterpolationDefault,
InterpolationNone,
InterpolationLow,
InterpolationMedium,
InterpolationHigh
};
TODO: record this, so we can know when to use bitmap-filtering when we draw
... not sure how meaningful this will be given our playback model.
Certainly safe to do nothing for the present.
*/
}
void GraphicsContext::clipConvexPolygon(size_t numPoints, const FloatPoint*, bool antialias)
{
if (paintingDisabled())
return;
if (numPoints <= 1)
return;
// FIXME: IMPLEMENT!
}
} // namespace WebCore
///////////////////////////////////////////////////////////////////////////////
SkCanvas* android_gc2canvas(WebCore::GraphicsContext* gc)
{
return gc->platformContext()->mCanvas;
}
|