summaryrefslogtreecommitdiffstats
path: root/core/jni/android/graphics/Canvas.cpp
blob: 52acf04c21e84cf31d2ff1282bb694deb3ac88de (plain)
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
/*
 * Copyright (C) 2006-2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "jni.h"
#include "GraphicsJNI.h"
#include <android_runtime/AndroidRuntime.h>

#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkGLCanvas.h"
#include "SkGraphics.h"
#include "SkImageRef_GlobalPool.h"
#include "SkShader.h"
#include "SkTemplates.h"

#define TIME_DRAWx

static uint32_t get_thread_msec() {
#if defined(HAVE_POSIX_CLOCKS)
    struct timespec tm;
    
    clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tm);
    
    return tm.tv_sec * 1000LL + tm.tv_nsec / 1000000;
#else
    struct timeval tv;
    
    gettimeofday(&tv, NULL);
    return tv.tv_sec * 1000LL + tv.tv_usec / 1000;
#endif
}

namespace android {

class SkCanvasGlue {
public:

    static void finalizer(JNIEnv* env, jobject clazz, SkCanvas* canvas) {
        canvas->unref();
    }

    static SkCanvas* initRaster(JNIEnv* env, jobject, SkBitmap* bitmap) {
        return bitmap ? new SkCanvas(*bitmap) : new SkCanvas;
    }
    
    static SkCanvas* initGL(JNIEnv* env, jobject) {
        return new SkGLCanvas;
    }
    
    static void freeCaches(JNIEnv* env, jobject) {
        // these are called in no particular order
        SkGLCanvas::DeleteAllTextures();
        SkImageRef_GlobalPool::SetRAMUsed(0);
        SkGraphics::SetFontCacheUsed(0);
    }
    
    static jboolean isOpaque(JNIEnv* env, jobject jcanvas) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);

        /*
            Currently we cannot support transparency in GL-based canvas' at
            the view level. Therefore we cannot base our answer on the device's
            bitmap, but need to hard-code the answer. If we relax this
            limitation in views, we can simplify the following code as well.
         
            Use the getViewport() call to find out if we're gl-based...
        */
        if (canvas->getViewport(NULL)) {
            return true;
        }
        
        // normal technique, rely on the device's bitmap for the answer
        return canvas->getDevice()->accessBitmap(false).isOpaque();
    }
    
    static int getWidth(JNIEnv* env, jobject jcanvas) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);
        return canvas->getDevice()->accessBitmap(false).width();
    }
    
    static int getHeight(JNIEnv* env, jobject jcanvas) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);
        return canvas->getDevice()->accessBitmap(false).height();
    }

    static void setViewport(JNIEnv* env, jobject, SkCanvas* canvas,
                            int width, int height) {
        canvas->setViewport(width, height);
    }
    
    static void setBitmap(JNIEnv* env, jobject, SkCanvas* canvas,
                          SkBitmap* bitmap) {
        canvas->setBitmapDevice(*bitmap);
    }
 
    static int saveAll(JNIEnv* env, jobject jcanvas) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        return GraphicsJNI::getNativeCanvas(env, jcanvas)->save();
    }
    
    static int save(JNIEnv* env, jobject jcanvas, SkCanvas::SaveFlags flags) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        return GraphicsJNI::getNativeCanvas(env, jcanvas)->save(flags);
    }
    
    static int saveLayer(JNIEnv* env, jobject, SkCanvas* canvas, jobject bounds,
                         SkPaint* paint, int flags) {
        SkRect* bounds_ = NULL;
        SkRect  storage;
        if (bounds != NULL) {
            GraphicsJNI::jrectf_to_rect(env, bounds, &storage);
            bounds_ = &storage;
        }
        return canvas->saveLayer(bounds_, paint, (SkCanvas::SaveFlags)flags);
    }
 
    static int saveLayer4F(JNIEnv* env, jobject, SkCanvas* canvas,
                           jfloat l, jfloat t, jfloat r, jfloat b,
                           SkPaint* paint, int flags) {
        SkRect bounds;
        bounds.set(SkFloatToScalar(l), SkFloatToScalar(t), SkFloatToScalar(r),
                   SkFloatToScalar(b));
        return canvas->saveLayer(&bounds, paint, (SkCanvas::SaveFlags)flags);
    }
 
    static int saveLayerAlpha(JNIEnv* env, jobject, SkCanvas* canvas,
                              jobject bounds, int alpha, int flags) {
        SkRect* bounds_ = NULL;
        SkRect  storage;
        if (bounds != NULL) {
            GraphicsJNI::jrectf_to_rect(env, bounds, &storage);
            bounds_ = &storage;
        }
        return canvas->saveLayerAlpha(bounds_, alpha,
                                      (SkCanvas::SaveFlags)flags);
    }
 
    static int saveLayerAlpha4F(JNIEnv* env, jobject, SkCanvas* canvas,
                                jfloat l, jfloat t, jfloat r, jfloat b,
                                int alpha, int flags) {
        SkRect  bounds;
        bounds.set(SkFloatToScalar(l), SkFloatToScalar(t), SkFloatToScalar(r),
                   SkFloatToScalar(b));
        return canvas->saveLayerAlpha(&bounds, alpha,
                                      (SkCanvas::SaveFlags)flags);
    }
 
    static void restore(JNIEnv* env, jobject jcanvas) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);
        if (canvas->getSaveCount() <= 1) {  // cannot restore anymore
            doThrowISE(env, "Underflow in restore");
            return;
        }
        canvas->restore();
    }
 
    static int getSaveCount(JNIEnv* env, jobject jcanvas) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        return GraphicsJNI::getNativeCanvas(env, jcanvas)->getSaveCount();
    }
 
    static void restoreToCount(JNIEnv* env, jobject jcanvas, int restoreCount) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);
        if (restoreCount < 1) {
            doThrowIAE(env, "Underflow in restoreToCount");
            return;
        }
        canvas->restoreToCount(restoreCount);
    }
 
    static void translate(JNIEnv* env, jobject jcanvas, jfloat dx, jfloat dy) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        SkScalar dx_ = SkFloatToScalar(dx);
        SkScalar dy_ = SkFloatToScalar(dy);
        (void)GraphicsJNI::getNativeCanvas(env, jcanvas)->translate(dx_, dy_);
    }
 
    static void scale__FF(JNIEnv* env, jobject jcanvas, jfloat sx, jfloat sy) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        (void)GraphicsJNI::getNativeCanvas(env, jcanvas)->scale(sx_, sy_);
    }
 
    static void rotate__F(JNIEnv* env, jobject jcanvas, jfloat degrees) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        SkScalar degrees_ = SkFloatToScalar(degrees);
        (void)GraphicsJNI::getNativeCanvas(env, jcanvas)->rotate(degrees_);
    }
 
    static void skew__FF(JNIEnv* env, jobject jcanvas, jfloat sx, jfloat sy) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        (void)GraphicsJNI::getNativeCanvas(env, jcanvas)->skew(sx_, sy_);
    }
 
    static void concat(JNIEnv* env, jobject, SkCanvas* canvas,
                       const SkMatrix* matrix) {
        canvas->concat(*matrix);
    }
    
    static void setMatrix(JNIEnv* env, jobject, SkCanvas* canvas,
                          const SkMatrix* matrix) {
        if (NULL == matrix) {
            canvas->resetMatrix();
        } else {
            canvas->setMatrix(*matrix);
        }
    }
    
    static jboolean clipRect_FFFF(JNIEnv* env, jobject jcanvas, jfloat left,
                                  jfloat top, jfloat right, jfloat bottom) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        SkRect  r;
        r.set(SkFloatToScalar(left), SkFloatToScalar(top),
              SkFloatToScalar(right), SkFloatToScalar(bottom));
        SkCanvas* c = GraphicsJNI::getNativeCanvas(env, jcanvas);
        return c->clipRect(r);
    }
    
    static jboolean clipRect_IIII(JNIEnv* env, jobject jcanvas, jint left,
                                  jint top, jint right, jint bottom) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        SkRect  r;
        r.set(SkIntToScalar(left), SkIntToScalar(top),
              SkIntToScalar(right), SkIntToScalar(bottom));
        return GraphicsJNI::getNativeCanvas(env, jcanvas)->clipRect(r);
    }
    
    static jboolean clipRect_RectF(JNIEnv* env, jobject jcanvas, jobject rectf) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        NPE_CHECK_RETURN_ZERO(env, rectf);
        SkCanvas* c = GraphicsJNI::getNativeCanvas(env, jcanvas);
        SkRect tmp;
        return c->clipRect(*GraphicsJNI::jrectf_to_rect(env, rectf, &tmp));
    }
    
    static jboolean clipRect_Rect(JNIEnv* env, jobject jcanvas, jobject rect) {
        NPE_CHECK_RETURN_ZERO(env, jcanvas);
        NPE_CHECK_RETURN_ZERO(env, rect);
        SkCanvas* c = GraphicsJNI::getNativeCanvas(env, jcanvas);
        SkRect tmp;
        return c->clipRect(*GraphicsJNI::jrect_to_rect(env, rect, &tmp));
    }
    
    static jboolean clipRect(JNIEnv* env, jobject, SkCanvas* canvas,
                             float left, float top, float right, float bottom,
                             int op) {
        SkRect rect;
        rect.set(SkFloatToScalar(left), SkFloatToScalar(top),
                 SkFloatToScalar(right), SkFloatToScalar(bottom));
        return canvas->clipRect(rect, (SkRegion::Op)op);
    }
 
    static jboolean clipPath(JNIEnv* env, jobject, SkCanvas* canvas,
                             SkPath* path, int op) {
        return canvas->clipPath(*path, (SkRegion::Op)op);
    }
 
    static jboolean clipRegion(JNIEnv* env, jobject, SkCanvas* canvas,
                               SkRegion* deviceRgn, int op) {
        return canvas->clipRegion(*deviceRgn, (SkRegion::Op)op);
    }
    
    static void setDrawFilter(JNIEnv* env, jobject, SkCanvas* canvas,
                              SkDrawFilter* filter) {
        canvas->setDrawFilter(filter);
    }
    
    static jboolean quickReject__RectFI(JNIEnv* env, jobject, SkCanvas* canvas,
                                        jobject rect, int edgetype) {
        SkRect rect_;
        GraphicsJNI::jrectf_to_rect(env, rect, &rect_);
        return canvas->quickReject(rect_, (SkCanvas::EdgeType)edgetype);
    }
 
    static jboolean quickReject__PathI(JNIEnv* env, jobject, SkCanvas* canvas,
                                       SkPath* path, int edgetype) {
        return canvas->quickReject(*path, (SkCanvas::EdgeType)edgetype);
    }
 
    static jboolean quickReject__FFFFI(JNIEnv* env, jobject, SkCanvas* canvas,
                                       jfloat left, jfloat top, jfloat right,
                                       jfloat bottom, int edgetype) {
        SkRect r;
        r.set(SkFloatToScalar(left), SkFloatToScalar(top),
              SkFloatToScalar(right), SkFloatToScalar(bottom));
        return canvas->quickReject(r, (SkCanvas::EdgeType)edgetype);
    }
 
    static void drawRGB(JNIEnv* env, jobject, SkCanvas* canvas,
                        jint r, jint g, jint b) {
        canvas->drawARGB(0xFF, r, g, b);
    }
 
    static void drawARGB(JNIEnv* env, jobject, SkCanvas* canvas,
                         jint a, jint r, jint g, jint b) {
        canvas->drawARGB(a, r, g, b);
    }
 
    static void drawColor__I(JNIEnv* env, jobject, SkCanvas* canvas,
                             jint color) {
        canvas->drawColor(color);
    }
 
    static void drawColor__II(JNIEnv* env, jobject, SkCanvas* canvas,
                              jint color, SkPorterDuff::Mode mode) {
        canvas->drawColor(color, mode);
    }
 
    static void drawPaint(JNIEnv* env, jobject, SkCanvas* canvas,
                          SkPaint* paint) {
        canvas->drawPaint(*paint);
    }
    
    static void doPoints(JNIEnv* env, jobject jcanvas, jfloatArray jptsArray,
                         jint offset, jint count, jobject jpaint,
                         SkCanvas::PointMode mode) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        NPE_CHECK_RETURN_VOID(env, jptsArray);
        NPE_CHECK_RETURN_VOID(env, jpaint);
        SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);
        const SkPaint& paint = *GraphicsJNI::getNativePaint(env, jpaint);
        
        AutoJavaFloatArray autoPts(env, jptsArray);
        float* floats = autoPts.ptr();
        const int length = autoPts.length();
        
        if ((offset | count) < 0 || offset + count > length) {
            doThrowAIOOBE(env);
            return;
        }
        
        // now convert the floats into SkPoints
        count >>= 1;    // now it is the number of points
        SkAutoSTMalloc<32, SkPoint> storage(count);
        SkPoint* pts = storage.get();
        const float* src = floats + offset;
        for (int i = 0; i < count; i++) {
            pts[i].set(SkFloatToScalar(src[0]), SkFloatToScalar(src[1]));
            src += 2;
        }        
        canvas->drawPoints(mode, count, pts, paint);
    }
    
    static void drawPoints(JNIEnv* env, jobject jcanvas, jfloatArray jptsArray,
                           jint offset, jint count, jobject jpaint) {
        doPoints(env, jcanvas, jptsArray, offset, count, jpaint,
                 SkCanvas::kPoints_PointMode);
    }
    
    static void drawLines(JNIEnv* env, jobject jcanvas, jfloatArray jptsArray,
                           jint offset, jint count, jobject jpaint) {
        doPoints(env, jcanvas, jptsArray, offset, count, jpaint,
                 SkCanvas::kLines_PointMode);
    }
    
    static void drawPoint(JNIEnv* env, jobject jcanvas, float x, float y,
                          jobject jpaint) {
        NPE_CHECK_RETURN_VOID(env, jcanvas);
        NPE_CHECK_RETURN_VOID(env, jpaint);
        SkCanvas* canvas = GraphicsJNI::getNativeCanvas(env, jcanvas);
        const SkPaint& paint = *GraphicsJNI::getNativePaint(env, jpaint);
        
        canvas->drawPoint(SkFloatToScalar(x), SkFloatToScalar(y), paint);
    }
 
    static void drawLine__FFFFPaint(JNIEnv* env, jobject, SkCanvas* canvas,
                                    jfloat startX, jfloat startY, jfloat stopX,
                                    jfloat stopY, SkPaint* paint) {
        canvas->drawLine(SkFloatToScalar(startX), SkFloatToScalar(startY),
                         SkFloatToScalar(stopX), SkFloatToScalar(stopY),
                         *paint);
    }
 
    static void drawRect__RectFPaint(JNIEnv* env, jobject, SkCanvas* canvas,
                                     jobject rect, SkPaint* paint) {
        SkRect rect_;
        GraphicsJNI::jrectf_to_rect(env, rect, &rect_);
        canvas->drawRect(rect_, *paint);
    }
 
    static void drawRect__FFFFPaint(JNIEnv* env, jobject, SkCanvas* canvas,
                                    jfloat left, jfloat top, jfloat right,
                                    jfloat bottom, SkPaint* paint) {
        SkScalar left_ = SkFloatToScalar(left);
        SkScalar top_ = SkFloatToScalar(top);
        SkScalar right_ = SkFloatToScalar(right);
        SkScalar bottom_ = SkFloatToScalar(bottom);
        canvas->drawRectCoords(left_, top_, right_, bottom_, *paint);
    }
 
    static void drawOval(JNIEnv* env, jobject, SkCanvas* canvas, jobject joval,
                         SkPaint* paint) {
        SkRect oval;
        GraphicsJNI::jrectf_to_rect(env, joval, &oval);
        canvas->drawOval(oval, *paint);
    }
 
    static void drawCircle(JNIEnv* env, jobject, SkCanvas* canvas, jfloat cx,
                           jfloat cy, jfloat radius, SkPaint* paint) {
        canvas->drawCircle(SkFloatToScalar(cx), SkFloatToScalar(cy),
                           SkFloatToScalar(radius), *paint);
    }
 
    static void drawArc(JNIEnv* env, jobject, SkCanvas* canvas, jobject joval,
                        jfloat startAngle, jfloat sweepAngle,
                        jboolean useCenter, SkPaint* paint) {
        SkRect oval;
        GraphicsJNI::jrectf_to_rect(env, joval, &oval);
        canvas->drawArc(oval, SkFloatToScalar(startAngle),
                        SkFloatToScalar(sweepAngle), useCenter, *paint);
    }
 
    static void drawRoundRect(JNIEnv* env, jobject, SkCanvas* canvas,
                              jobject jrect, jfloat rx, jfloat ry,
                              SkPaint* paint) {
        SkRect rect;
        GraphicsJNI::jrectf_to_rect(env, jrect, &rect);
        canvas->drawRoundRect(rect, SkFloatToScalar(rx), SkFloatToScalar(ry),
                              *paint);
    }
 
    static void drawPath(JNIEnv* env, jobject, SkCanvas* canvas, SkPath* path,
                         SkPaint* paint) {
        canvas->drawPath(*path, *paint);
    }
 
    static void drawPicture(JNIEnv* env, jobject, SkCanvas* canvas,
                            SkPicture* picture) {
        SkASSERT(canvas);
        SkASSERT(picture);
        
#ifdef TIME_DRAW
        SkMSec now = get_thread_msec(); //SkTime::GetMSecs();
#endif
        canvas->drawPicture(*picture);
#ifdef TIME_DRAW
        LOGD("---- picture playback %d ms\n", get_thread_msec() - now);
#endif
    }

    static void drawBitmap__BitmapFFPaint(JNIEnv* env, jobject jcanvas,
                                          SkCanvas* canvas, SkBitmap* bitmap,
                                          jfloat left, jfloat top,
                                          SkPaint* paint, jint canvasDensity,
                                          jint bitmapDensity) {
        SkScalar left_ = SkFloatToScalar(left);
        SkScalar top_ = SkFloatToScalar(top);

        if (canvasDensity == bitmapDensity || canvasDensity == 0
                || bitmapDensity == 0) {
            canvas->drawBitmap(*bitmap, left_, top_, paint);
        } else {
            canvas->save();
            SkScalar scale = SkFloatToScalar(canvasDensity / (float)bitmapDensity);
            canvas->translate(left_, top_);
            canvas->scale(scale, scale);

            SkPaint filteredPaint;
            if (paint) {
                filteredPaint = *paint;
            }
            filteredPaint.setFilterBitmap(true);

            canvas->drawBitmap(*bitmap, 0, 0, &filteredPaint);

            canvas->restore();
        }
    }

    static void doDrawBitmap(JNIEnv* env, SkCanvas* canvas, SkBitmap* bitmap,
                        jobject srcIRect, const SkRect& dst, SkPaint* paint) {
        SkIRect    src, *srcPtr = NULL;

        if (NULL != srcIRect) {
            GraphicsJNI::jrect_to_irect(env, srcIRect, &src);
            srcPtr = &src;
        }
        canvas->drawBitmapRect(*bitmap, srcPtr, dst, paint);
    }

    static void drawBitmapRF(JNIEnv* env, jobject, SkCanvas* canvas,
                             SkBitmap* bitmap, jobject srcIRect,
                             jobject dstRectF, SkPaint* paint) {
        SkRect      dst;
        GraphicsJNI::jrectf_to_rect(env, dstRectF, &dst);
        doDrawBitmap(env, canvas, bitmap, srcIRect, dst, paint);
    }
    
    static void drawBitmapRR(JNIEnv* env, jobject, SkCanvas* canvas,
                             SkBitmap* bitmap, jobject srcIRect,
                             jobject dstRect, SkPaint* paint) {
        SkRect      dst;
        GraphicsJNI::jrect_to_rect(env, dstRect, &dst);
        doDrawBitmap(env, canvas, bitmap, srcIRect, dst, paint);
    }
    
    static void drawBitmapArray(JNIEnv* env, jobject, SkCanvas* canvas,
                                jintArray jcolors, int offset, int stride,
                                jfloat x, jfloat y, int width, int height,
                                jboolean hasAlpha, SkPaint* paint)
    {
        SkBitmap    bitmap;
        
        bitmap.setConfig(hasAlpha ? SkBitmap::kARGB_8888_Config :
                         SkBitmap::kRGB_565_Config, width, height);
        if (!bitmap.allocPixels()) {
            return;
        }
        
        if (!GraphicsJNI::SetPixels(env, jcolors, offset, stride,
                                    0, 0, width, height, bitmap)) {
            return;
        }
        
        canvas->drawBitmap(bitmap, SkFloatToScalar(x), SkFloatToScalar(y),
                           paint);
    }
    
    static void drawBitmapMatrix(JNIEnv* env, jobject, SkCanvas* canvas,
                                 const SkBitmap* bitmap, const SkMatrix* matrix,
                                 const SkPaint* paint) {
        canvas->drawBitmapMatrix(*bitmap, *matrix, paint);
    }
    
    static void drawBitmapMesh(JNIEnv* env, jobject, SkCanvas* canvas,
                          const SkBitmap* bitmap, int meshWidth, int meshHeight,
                          jfloatArray jverts, int vertIndex, jintArray jcolors,
                          int colorIndex, const SkPaint* paint) {

        const int ptCount = (meshWidth + 1) * (meshHeight + 1);
        const int indexCount = meshWidth * meshHeight * 6;

        AutoJavaFloatArray  vertA(env, jverts, vertIndex + (ptCount << 1));
        AutoJavaIntArray    colorA(env, jcolors, colorIndex + ptCount);
        
        /*  Our temp storage holds 2 or 3 arrays.
            texture points [ptCount * sizeof(SkPoint)]
            optionally vertex points [ptCount * sizeof(SkPoint)] if we need a
                copy to convert from float to fixed
            indices [ptCount * sizeof(uint16_t)]
        */
        ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[]
#ifdef SK_SCALAR_IS_FIXED
        storageSize += ptCount * sizeof(SkPoint);  // storage for verts
#endif
        storageSize += indexCount * sizeof(uint16_t);  // indices[]

        SkAutoMalloc storage(storageSize);
        SkPoint* texs = (SkPoint*)storage.get();
        SkPoint* verts;
        uint16_t* indices;
#ifdef SK_SCALAR_IS_FLOAT
        verts = (SkPoint*)(vertA.ptr() + vertIndex);
        indices = (uint16_t*)(texs + ptCount);
#else
        verts = texs + ptCount;
        indices = (uint16_t*)(verts + ptCount);
        // convert floats to fixed
        {
            const float* src = vertA.ptr() + vertIndex;
            for (int i = 0; i < ptCount; i++) {
                verts[i].set(SkFloatToFixed(src[0]), SkFloatToFixed(src[1]));
                src += 2;
            }
        }
#endif

        // cons up texture coordinates and indices
        {
            const SkScalar w = SkIntToScalar(bitmap->width());
            const SkScalar h = SkIntToScalar(bitmap->height());
            const SkScalar dx = w / meshWidth;
            const SkScalar dy = h / meshHeight;
            
            SkPoint* texsPtr = texs;
            SkScalar y = 0;
            for (int i = 0; i <= meshHeight; i++) {
                if (i == meshHeight) {
                    y = h;  // to ensure numerically we hit h exactly
                }
                SkScalar x = 0;
                for (int j = 0; j < meshWidth; j++) {
                    texsPtr->set(x, y);
                    texsPtr += 1;
                    x += dx;
                }
                texsPtr->set(w, y);
                texsPtr += 1;
                y += dy;
            }
            SkASSERT(texsPtr - texs == ptCount);
        }
        
        // cons up indices
        {
            uint16_t* indexPtr = indices;
            int index = 0;
            for (int i = 0; i < meshHeight; i++) {
                for (int j = 0; j < meshWidth; j++) {
                    // lower-left triangle
                    *indexPtr++ = index;
                    *indexPtr++ = index + meshWidth + 1;
                    *indexPtr++ = index + meshWidth + 2;
                    // upper-right triangle
                    *indexPtr++ = index;
                    *indexPtr++ = index + meshWidth + 2;
                    *indexPtr++ = index + 1;
                    // bump to the next cell
                    index += 1;
                }
                // bump to the next row
                index += 1;
            }
            SkASSERT(indexPtr - indices == indexCount);
            SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize);
        }

        // double-check that we have legal indices
#ifdef SK_DEBUG
        {
            for (int i = 0; i < indexCount; i++) {
                SkASSERT((unsigned)indices[i] < (unsigned)ptCount);
            }
        }
#endif

        // cons-up a shader for the bitmap
        SkPaint tmpPaint;
        if (paint) {
            tmpPaint = *paint;
        }
        SkShader* shader = SkShader::CreateBitmapShader(*bitmap,
                        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
        tmpPaint.setShader(shader)->safeUnref();

        canvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, verts,
                             texs, (const SkColor*)colorA.ptr(), NULL, indices,
                             indexCount, tmpPaint);
    }

    static void drawVertices(JNIEnv* env, jobject, SkCanvas* canvas,
                             SkCanvas::VertexMode mode, int vertexCount,
                             jfloatArray jverts, int vertIndex,
                             jfloatArray jtexs, int texIndex,
                             jintArray jcolors, int colorIndex,
                             jshortArray jindices, int indexIndex,
                             int indexCount, const SkPaint* paint) {

        AutoJavaFloatArray  vertA(env, jverts, vertIndex + vertexCount);
        AutoJavaFloatArray  texA(env, jtexs, texIndex + vertexCount);
        AutoJavaIntArray    colorA(env, jcolors, colorIndex + vertexCount);
        AutoJavaShortArray  indexA(env, jindices, indexIndex + indexCount);

        const int ptCount = vertexCount >> 1;

        SkPoint* verts;
        SkPoint* texs = NULL;
#ifdef SK_SCALAR_IS_FLOAT
        verts = (SkPoint*)(vertA.ptr() + vertIndex);
        if (jtexs != NULL) {
            texs = (SkPoint*)(texA.ptr() + texIndex);
        }
#else
        int count = ptCount;    // for verts
        if (jtexs != NULL) {
            count += ptCount;   // += for texs
        }
        SkAutoMalloc storage(count * sizeof(SkPoint));
        verts = (SkPoint*)storage.get();        
        const float* src = vertA.ptr() + vertIndex;
        for (int i = 0; i < ptCount; i++) {
            verts[i].set(SkFloatToFixed(src[0]), SkFloatToFixed(src[1]));
            src += 2;
        }
        if (jtexs != NULL) {
            texs = verts + ptCount;
            src = texA.ptr() + texIndex;
            for (int i = 0; i < ptCount; i++) {
                texs[i].set(SkFloatToFixed(src[0]), SkFloatToFixed(src[1]));
                src += 2;
            }
        }
#endif

        const SkColor* colors = NULL;
        const uint16_t* indices = NULL;
        if (jcolors != NULL) {
            colors = (const SkColor*)(colorA.ptr() + colorIndex);
        }
        if (jindices != NULL) {
            indices = (const uint16_t*)(indexA.ptr() + indexIndex);
        }

        canvas->drawVertices(mode, ptCount, verts, texs, colors, NULL,
                             indices, indexCount, *paint);
    }
    
    static void drawText___CIIFFPaint(JNIEnv* env, jobject, SkCanvas* canvas,
                                      jcharArray text, int index, int count,
                                      jfloat x, jfloat y, SkPaint* paint) {
        jchar* textArray = env->GetCharArrayElements(text, NULL);
        jsize textCount = env->GetArrayLength(text);
        SkScalar x_ = SkFloatToScalar(x);
        SkScalar y_ = SkFloatToScalar(y);
        canvas->drawText(textArray + index, count << 1, x_, y_, *paint);
        env->ReleaseCharArrayElements(text, textArray, 0);
    }
 
    static void drawText__StringIIFFPaint(JNIEnv* env, jobject,
                            SkCanvas* canvas, jstring text, int start, int end,
                                          jfloat x, jfloat y, SkPaint* paint) {
        const void* text_ = env->GetStringChars(text, NULL);
        SkScalar x_ = SkFloatToScalar(x);
        SkScalar y_ = SkFloatToScalar(y);
        canvas->drawText((const uint16_t*)text_ + start, (end - start) << 1,
                         x_, y_, *paint);
        env->ReleaseStringChars(text, (const jchar*) text_);
    }
    
    static void drawString(JNIEnv* env, jobject canvas, jstring text,
                           jfloat x, jfloat y, jobject paint) {
        NPE_CHECK_RETURN_VOID(env, canvas);
        NPE_CHECK_RETURN_VOID(env, paint);
        NPE_CHECK_RETURN_VOID(env, text);
        size_t count = env->GetStringLength(text);
        if (0 == count) {
            return;
        }
        const jchar* text_ = env->GetStringChars(text, NULL);
        SkCanvas* c = GraphicsJNI::getNativeCanvas(env, canvas);
        c->drawText(text_, count << 1, SkFloatToScalar(x), SkFloatToScalar(y),
                    *GraphicsJNI::getNativePaint(env, paint));
        env->ReleaseStringChars(text, text_);
    }
    
    static void drawPosText___CII_FPaint(JNIEnv* env, jobject, SkCanvas* canvas,
                                         jcharArray text, int index, int count,
                                         jfloatArray pos, SkPaint* paint) {
        jchar* textArray = text ? env->GetCharArrayElements(text, NULL) : NULL;
        jsize textCount = text ? env->GetArrayLength(text) : NULL;
        float* posArray = pos ? env->GetFloatArrayElements(pos, NULL) : NULL;
        int posCount = pos ? env->GetArrayLength(pos) >> 1: 0;
        SkPoint* posPtr = posCount > 0 ? new SkPoint[posCount] : NULL;
        int indx;
        for (indx = 0; indx < posCount; indx++) {
            posPtr[indx].fX = SkFloatToScalar(posArray[indx << 1]);
            posPtr[indx].fY = SkFloatToScalar(posArray[(indx << 1) + 1]);
        }
        canvas->drawPosText(textArray + index, count << 1, posPtr, *paint);
        if (text) {
            env->ReleaseCharArrayElements(text, textArray, 0);
        }
        if (pos) {
            env->ReleaseFloatArrayElements(pos, posArray, 0);
        }
        delete[] posPtr;
    }
 
    static void drawPosText__String_FPaint(JNIEnv* env, jobject,
                                           SkCanvas* canvas, jstring text,
                                           jfloatArray pos, SkPaint* paint) {
        const void* text_ = text ? env->GetStringChars(text, NULL) : NULL;
        int byteLength = text ? env->GetStringLength(text) : 0;
        float* posArray = pos ? env->GetFloatArrayElements(pos, NULL) : NULL;
        int posCount = pos ? env->GetArrayLength(pos) >> 1: 0;
        SkPoint* posPtr = posCount > 0 ? new SkPoint[posCount] : NULL;

        for (int indx = 0; indx < posCount; indx++) {
            posPtr[indx].fX = SkFloatToScalar(posArray[indx << 1]);
            posPtr[indx].fY = SkFloatToScalar(posArray[(indx << 1) + 1]);
        }
        canvas->drawPosText(text_, byteLength << 1, posPtr, *paint);
        if (text) {
            env->ReleaseStringChars(text, (const jchar*) text_);
        }
        if (pos) {
            env->ReleaseFloatArrayElements(pos, posArray, 0);
        }
        delete[] posPtr;
    }
 
    static void drawTextOnPath___CIIPathFFPaint(JNIEnv* env, jobject,
                        SkCanvas* canvas, jcharArray text, int index, int count,
                SkPath* path, jfloat hOffset, jfloat vOffset, SkPaint* paint) {

        jchar* textArray = env->GetCharArrayElements(text, NULL);
        canvas->drawTextOnPathHV(textArray + index, count << 1, *path,
                    SkFloatToScalar(hOffset), SkFloatToScalar(vOffset), *paint);
        env->ReleaseCharArrayElements(text, textArray, 0);
    }
 
    static void drawTextOnPath__StringPathFFPaint(JNIEnv* env, jobject,
                            SkCanvas* canvas, jstring text, SkPath* path,
                            jfloat hOffset, jfloat vOffset, SkPaint* paint) {
        const jchar* text_ = env->GetStringChars(text, NULL);
        int byteLength = env->GetStringLength(text) << 1;
        canvas->drawTextOnPathHV(text_, byteLength, *path,
                    SkFloatToScalar(hOffset), SkFloatToScalar(vOffset), *paint);
        env->ReleaseStringChars(text, text_);
    }
 
    static bool getClipBounds(JNIEnv* env, jobject, SkCanvas* canvas,
                              jobject bounds) {
        SkRect   r;
        SkIRect ir;
        bool     result = canvas->getClipBounds(&r, SkCanvas::kBW_EdgeType);

        r.round(&ir);
        (void)GraphicsJNI::irect_to_jrect(ir, env, bounds);
        return result;
    }

    static void getCTM(JNIEnv* env, jobject, SkCanvas* canvas,
                       SkMatrix* matrix) {
        *matrix = canvas->getTotalMatrix();
    }
};
    
///////////////////////////////////////////////////////////////////////////////

static JNINativeMethod gCanvasMethods[] = {
    {"finalizer", "(I)V", (void*) SkCanvasGlue::finalizer},
    {"initRaster","(I)I", (void*) SkCanvasGlue::initRaster},
    {"initGL","()I", (void*) SkCanvasGlue::initGL},
    {"isOpaque","()Z", (void*) SkCanvasGlue::isOpaque},
    {"getWidth","()I", (void*) SkCanvasGlue::getWidth},
    {"getHeight","()I", (void*) SkCanvasGlue::getHeight},
    {"native_setBitmap","(II)V", (void*) SkCanvasGlue::setBitmap},
    {"nativeSetViewport", "(III)V", (void*) SkCanvasGlue::setViewport},
    {"save","()I", (void*) SkCanvasGlue::saveAll},
    {"save","(I)I", (void*) SkCanvasGlue::save},
    {"native_saveLayer","(ILandroid/graphics/RectF;II)I",
        (void*) SkCanvasGlue::saveLayer},
    {"native_saveLayer","(IFFFFII)I", (void*) SkCanvasGlue::saveLayer4F},
    {"native_saveLayerAlpha","(ILandroid/graphics/RectF;II)I",
        (void*) SkCanvasGlue::saveLayerAlpha},
    {"native_saveLayerAlpha","(IFFFFII)I",
        (void*) SkCanvasGlue::saveLayerAlpha4F},
    {"restore","()V", (void*) SkCanvasGlue::restore},
    {"getSaveCount","()I", (void*) SkCanvasGlue::getSaveCount},
    {"restoreToCount","(I)V", (void*) SkCanvasGlue::restoreToCount},
    {"translate","(FF)V", (void*) SkCanvasGlue::translate},
    {"scale","(FF)V", (void*) SkCanvasGlue::scale__FF},
    {"rotate","(F)V", (void*) SkCanvasGlue::rotate__F},
    {"skew","(FF)V", (void*) SkCanvasGlue::skew__FF},
    {"native_concat","(II)V", (void*) SkCanvasGlue::concat},
    {"native_setMatrix","(II)V", (void*) SkCanvasGlue::setMatrix},
    {"clipRect","(FFFF)Z", (void*) SkCanvasGlue::clipRect_FFFF},
    {"clipRect","(IIII)Z", (void*) SkCanvasGlue::clipRect_IIII},
    {"clipRect","(Landroid/graphics/RectF;)Z",
        (void*) SkCanvasGlue::clipRect_RectF},
    {"clipRect","(Landroid/graphics/Rect;)Z",
        (void*) SkCanvasGlue::clipRect_Rect},
    {"native_clipRect","(IFFFFI)Z", (void*) SkCanvasGlue::clipRect},
    {"native_clipPath","(III)Z", (void*) SkCanvasGlue::clipPath},
    {"native_clipRegion","(III)Z", (void*) SkCanvasGlue::clipRegion},
    {"nativeSetDrawFilter", "(II)V", (void*) SkCanvasGlue::setDrawFilter},
    {"native_getClipBounds","(ILandroid/graphics/Rect;)Z",
        (void*) SkCanvasGlue::getClipBounds},
    {"native_getCTM", "(II)V", (void*)SkCanvasGlue::getCTM},
    {"native_quickReject","(ILandroid/graphics/RectF;I)Z",
        (void*) SkCanvasGlue::quickReject__RectFI},
    {"native_quickReject","(III)Z", (void*) SkCanvasGlue::quickReject__PathI},
    {"native_quickReject","(IFFFFI)Z", (void*)SkCanvasGlue::quickReject__FFFFI},
    {"native_drawRGB","(IIII)V", (void*) SkCanvasGlue::drawRGB},
    {"native_drawARGB","(IIIII)V", (void*) SkCanvasGlue::drawARGB},
    {"native_drawColor","(II)V", (void*) SkCanvasGlue::drawColor__I},
    {"native_drawColor","(III)V", (void*) SkCanvasGlue::drawColor__II},
    {"native_drawPaint","(II)V", (void*) SkCanvasGlue::drawPaint},
    {"drawPoint", "(FFLandroid/graphics/Paint;)V",
    (void*) SkCanvasGlue::drawPoint},
    {"drawPoints", "([FIILandroid/graphics/Paint;)V",
        (void*) SkCanvasGlue::drawPoints},
    {"drawLines", "([FIILandroid/graphics/Paint;)V",
        (void*) SkCanvasGlue::drawLines},
    {"native_drawLine","(IFFFFI)V", (void*) SkCanvasGlue::drawLine__FFFFPaint},
    {"native_drawRect","(ILandroid/graphics/RectF;I)V",
        (void*) SkCanvasGlue::drawRect__RectFPaint},
    {"native_drawRect","(IFFFFI)V", (void*) SkCanvasGlue::drawRect__FFFFPaint},
    {"native_drawOval","(ILandroid/graphics/RectF;I)V",
        (void*) SkCanvasGlue::drawOval},
    {"native_drawCircle","(IFFFI)V", (void*) SkCanvasGlue::drawCircle},
    {"native_drawArc","(ILandroid/graphics/RectF;FFZI)V",
        (void*) SkCanvasGlue::drawArc},
    {"native_drawRoundRect","(ILandroid/graphics/RectF;FFI)V",
        (void*) SkCanvasGlue::drawRoundRect},
    {"native_drawPath","(III)V", (void*) SkCanvasGlue::drawPath},
    {"native_drawBitmap","(IIFFIII)V",
        (void*) SkCanvasGlue::drawBitmap__BitmapFFPaint},
    {"native_drawBitmap","(IILandroid/graphics/Rect;Landroid/graphics/RectF;I)V",
        (void*) SkCanvasGlue::drawBitmapRF},
    {"native_drawBitmap","(IILandroid/graphics/Rect;Landroid/graphics/Rect;I)V",
        (void*) SkCanvasGlue::drawBitmapRR},
    {"native_drawBitmap", "(I[IIIFFIIZI)V",
    (void*)SkCanvasGlue::drawBitmapArray},
    
    {"nativeDrawBitmapMatrix", "(IIII)V",
        (void*)SkCanvasGlue::drawBitmapMatrix},
    {"nativeDrawBitmapMesh", "(IIII[FI[III)V",
        (void*)SkCanvasGlue::drawBitmapMesh},
    {"nativeDrawVertices", "(III[FI[FI[II[SIII)V",
        (void*)SkCanvasGlue::drawVertices},
    {"native_drawText","(I[CIIFFI)V",
        (void*) SkCanvasGlue::drawText___CIIFFPaint},
    {"native_drawText","(ILjava/lang/String;IIFFI)V",
        (void*) SkCanvasGlue::drawText__StringIIFFPaint},
    {"drawText","(Ljava/lang/String;FFLandroid/graphics/Paint;)V",
        (void*) SkCanvasGlue::drawString},
    {"native_drawPosText","(I[CII[FI)V",
        (void*) SkCanvasGlue::drawPosText___CII_FPaint},
    {"native_drawPosText","(ILjava/lang/String;[FI)V",
        (void*) SkCanvasGlue::drawPosText__String_FPaint},
    {"native_drawTextOnPath","(I[CIIIFFI)V",
        (void*) SkCanvasGlue::drawTextOnPath___CIIPathFFPaint},
    {"native_drawTextOnPath","(ILjava/lang/String;IFFI)V",
        (void*) SkCanvasGlue::drawTextOnPath__StringPathFFPaint},
    {"native_drawPicture", "(II)V", (void*) SkCanvasGlue::drawPicture},

    {"freeCaches", "()V", (void*) SkCanvasGlue::freeCaches}
};

#include <android_runtime/AndroidRuntime.h>

#define REG(env, name, array) \
    result = android::AndroidRuntime::registerNativeMethods(env, name, array, \
                                                    SK_ARRAY_COUNT(array));  \
    if (result < 0) return result

int register_android_graphics_Canvas(JNIEnv* env) {
    int result;

    REG(env, "android/graphics/Canvas", gCanvasMethods);
    
    return result;
}

}