aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/gpu/GrContext.cpp
blob: fd788cbd93b89d33d020b845ac5b350c191d7fc8 (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

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "GrContext.h"

#include "GrAARectRenderer.h"
#include "GrBatch.h"
#include "GrBatchFontCache.h"
#include "GrBatchTarget.h"
#include "GrBatchTest.h"
#include "GrBufferedDrawTarget.h"
#include "GrCaps.h"
#include "GrContextOptions.h"
#include "GrDefaultGeoProcFactory.h"
#include "GrDrawContext.h"
#include "GrGpuResource.h"
#include "GrGpuResourcePriv.h"
#include "GrGpu.h"
#include "GrImmediateDrawTarget.h"
#include "GrIndexBuffer.h"
#include "GrLayerCache.h"
#include "GrOvalRenderer.h"
#include "GrPathRenderer.h"
#include "GrPathUtils.h"
#include "GrRenderTargetPriv.h"
#include "GrResourceCache.h"
#include "GrResourceProvider.h"
#include "GrSoftwarePathRenderer.h"
#include "GrStrokeInfo.h"
#include "GrSurfacePriv.h"
#include "GrTextBlobCache.h"
#include "GrTexturePriv.h"
#include "GrTraceMarker.h"
#include "GrTracing.h"
#include "GrVertices.h"
#include "SkDashPathPriv.h"
#include "SkConfig8888.h"
#include "SkGr.h"
#include "SkRRect.h"
#include "SkStrokeRec.h"
#include "SkSurfacePriv.h"
#include "SkTLazy.h"
#include "SkTLS.h"
#include "SkTraceEvent.h"

#include "effects/GrConfigConversionEffect.h"
#include "effects/GrDashingEffect.h"
#include "effects/GrSingleTextureEffect.h"

#define ASSERT_OWNED_RESOURCE(R) SkASSERT(!(R) || (R)->getContext() == this)
#define RETURN_IF_ABANDONED if (fDrawingMgr.abandoned()) { return; }
#define RETURN_FALSE_IF_ABANDONED if (fDrawingMgr.abandoned()) { return false; }
#define RETURN_NULL_IF_ABANDONED if (fDrawingMgr.abandoned()) { return NULL; }


////////////////////////////////////////////////////////////////////////////////

void GrContext::DrawingMgr::init(GrContext* context) {
    fContext = context;

#ifdef IMMEDIATE_MODE
    fDrawTarget = SkNEW_ARGS(GrImmediateDrawTarget, (context));
#else
    fDrawTarget = SkNEW_ARGS(GrBufferedDrawTarget, (context));
#endif    
}

void GrContext::DrawingMgr::cleanup() {
    SkSafeSetNull(fDrawTarget);
    for (int i = 0; i < kNumPixelGeometries; ++i) {
        SkSafeSetNull(fDrawContext[i][0]);
        SkSafeSetNull(fDrawContext[i][1]);
    }
}

GrContext::DrawingMgr::~DrawingMgr() {
    this->cleanup();
}

void GrContext::DrawingMgr::abandon() {
    SkSafeSetNull(fDrawTarget);
    for (int i = 0; i < kNumPixelGeometries; ++i) {
        for (int j = 0; j < kNumDFTOptions; ++j) {
            if (fDrawContext[i][j]) {
                SkSafeSetNull(fDrawContext[i][j]->fDrawTarget);
                SkSafeSetNull(fDrawContext[i][j]);
            }
        }
    }
}

void GrContext::DrawingMgr::purgeResources() {
    if (fDrawTarget) {
        fDrawTarget->purgeResources();
    }
}

void GrContext::DrawingMgr::reset() {
    if (fDrawTarget) {
        fDrawTarget->reset();
    }
}

void GrContext::DrawingMgr::flush() {
    if (fDrawTarget) {
        fDrawTarget->flush();
    }
}

GrDrawContext* GrContext::DrawingMgr::drawContext(const SkSurfaceProps* surfaceProps) { 
    if (this->abandoned()) {
        return NULL;
    }

    const SkSurfaceProps props(SkSurfacePropsCopyOrDefault(surfaceProps));

    SkASSERT(props.pixelGeometry() < kNumPixelGeometries);
    if (!fDrawContext[props.pixelGeometry()][props.isUseDistanceFieldFonts()]) {
        fDrawContext[props.pixelGeometry()][props.isUseDistanceFieldFonts()] =
                SkNEW_ARGS(GrDrawContext, (fContext, fDrawTarget, props));
    }

    return fDrawContext[props.pixelGeometry()][props.isUseDistanceFieldFonts()]; 
}

////////////////////////////////////////////////////////////////////////////////


GrContext* GrContext::Create(GrBackend backend, GrBackendContext backendContext) {
    GrContextOptions defaultOptions;
    return Create(backend, backendContext, defaultOptions);
}

GrContext* GrContext::Create(GrBackend backend, GrBackendContext backendContext,
                             const GrContextOptions& options) {
    GrContext* context = SkNEW(GrContext);

    if (context->init(backend, backendContext, options)) {
        return context;
    } else {
        context->unref();
        return NULL;
    }
}

static int32_t gNextID = 1;
static int32_t next_id() {
    int32_t id;
    do {
        id = sk_atomic_inc(&gNextID);
    } while (id == SK_InvalidGenID);
    return id;
}

GrContext::GrContext() : fUniqueID(next_id()) {
    fGpu = NULL;
    fCaps = NULL;
    fResourceCache = NULL;
    fResourceProvider = NULL;
    fPathRendererChain = NULL;
    fSoftwarePathRenderer = NULL;
    fBatchFontCache = NULL;
    fFlushToReduceCacheSize = false;
}

bool GrContext::init(GrBackend backend, GrBackendContext backendContext,
                     const GrContextOptions& options) {
    SkASSERT(!fGpu);

    fGpu = GrGpu::Create(backend, backendContext, options, this);
    if (!fGpu) {
        return false;
    }
    this->initCommon();
    return true;
}

void GrContext::initCommon() {
    fCaps = SkRef(fGpu->caps());
    fResourceCache = SkNEW(GrResourceCache);
    fResourceCache->setOverBudgetCallback(OverBudgetCB, this);
    fResourceProvider = SkNEW_ARGS(GrResourceProvider, (fGpu, fResourceCache));

    fLayerCache.reset(SkNEW_ARGS(GrLayerCache, (this)));

    fDidTestPMConversions = false;

    fDrawingMgr.init(this);

    // GrBatchFontCache will eventually replace GrFontCache
    fBatchFontCache = SkNEW_ARGS(GrBatchFontCache, (this));

    fTextBlobCache.reset(SkNEW_ARGS(GrTextBlobCache, (TextBlobCacheOverBudgetCB, this)));
}

GrContext::~GrContext() {
    if (!fGpu) {
        SkASSERT(!fCaps);
        return;
    }

    this->flush();

    fDrawingMgr.cleanup();

    for (int i = 0; i < fCleanUpData.count(); ++i) {
        (*fCleanUpData[i].fFunc)(this, fCleanUpData[i].fInfo);
    }

    SkDELETE(fResourceProvider);
    SkDELETE(fResourceCache);
    SkDELETE(fBatchFontCache);

    fGpu->unref();
    fCaps->unref();
    SkSafeUnref(fPathRendererChain);
    SkSafeUnref(fSoftwarePathRenderer);
}

void GrContext::abandonContext() {
    fResourceProvider->abandon();
    // abandon first to so destructors
    // don't try to free the resources in the API.
    fResourceCache->abandonAll();

    fGpu->contextAbandoned();

    // a path renderer may be holding onto resources that
    // are now unusable
    SkSafeSetNull(fPathRendererChain);
    SkSafeSetNull(fSoftwarePathRenderer);

    fDrawingMgr.abandon();

    fBatchFontCache->freeAll();
    fLayerCache->freeAll();
    fTextBlobCache->freeAll();
}

void GrContext::resetContext(uint32_t state) {
    fGpu->markContextDirty(state);
}

void GrContext::freeGpuResources() {
    this->flush();

    fDrawingMgr.purgeResources();

    fBatchFontCache->freeAll();
    fLayerCache->freeAll();
    // a path renderer may be holding onto resources
    SkSafeSetNull(fPathRendererChain);
    SkSafeSetNull(fSoftwarePathRenderer);

    fResourceCache->purgeAllUnlocked();
}

void GrContext::getResourceCacheUsage(int* resourceCount, size_t* resourceBytes) const {
    if (resourceCount) {
        *resourceCount = fResourceCache->getBudgetedResourceCount();
    }
    if (resourceBytes) {
        *resourceBytes = fResourceCache->getBudgetedResourceBytes();
    }
}

////////////////////////////////////////////////////////////////////////////////

void GrContext::OverBudgetCB(void* data) {
    SkASSERT(data);

    GrContext* context = reinterpret_cast<GrContext*>(data);

    // Flush the GrBufferedDrawTarget to possibly free up some textures
    context->fFlushToReduceCacheSize = true;
}

void GrContext::TextBlobCacheOverBudgetCB(void* data) {
    SkASSERT(data);

    // Unlike the GrResourceCache, TextBlobs are drawn at the SkGpuDevice level, therefore they
    // cannot use fFlushTorReduceCacheSize because it uses AutoCheckFlush.  The solution is to move
    // drawText calls to below the GrContext level, but this is not trivial because they call
    // drawPath on SkGpuDevice
    GrContext* context = reinterpret_cast<GrContext*>(data);
    context->flush();
}

////////////////////////////////////////////////////////////////////////////////

void GrContext::flush(int flagsBitfield) {
    RETURN_IF_ABANDONED

    if (kDiscard_FlushBit & flagsBitfield) {
        fDrawingMgr.reset();
    } else {
        fDrawingMgr.flush();
    }
    fResourceCache->notifyFlushOccurred();
    fFlushToReduceCacheSize = false;
}

bool sw_convert_to_premul(GrPixelConfig srcConfig, int width, int height, size_t inRowBytes,
                          const void* inPixels, size_t outRowBytes, void* outPixels) {
    SkSrcPixelInfo srcPI;
    if (!GrPixelConfig2ColorAndProfileType(srcConfig, &srcPI.fColorType, NULL)) {
        return false;
    }
    srcPI.fAlphaType = kUnpremul_SkAlphaType;
    srcPI.fPixels = inPixels;
    srcPI.fRowBytes = inRowBytes;

    SkDstPixelInfo dstPI;
    dstPI.fColorType = srcPI.fColorType;
    dstPI.fAlphaType = kPremul_SkAlphaType;
    dstPI.fPixels = outPixels;
    dstPI.fRowBytes = outRowBytes;

    return srcPI.convertPixelsTo(&dstPI, width, height);
}

bool GrContext::writeSurfacePixels(GrSurface* surface,
                                   int left, int top, int width, int height,
                                   GrPixelConfig srcConfig, const void* buffer, size_t rowBytes,
                                   uint32_t pixelOpsFlags) {
    RETURN_FALSE_IF_ABANDONED

    // Trim the params here so that if we wind up making a temporary surface it can be as small as
    // necessary and because GrGpu::getWritePixelsInfo requires it.
    if (!GrSurfacePriv::AdjustWritePixelParams(surface->width(), surface->height(),
                                               GrBytesPerPixel(srcConfig), &left, &top, &width,
                                               &height, &buffer, &rowBytes)) {
        return false;
    }

    bool applyPremulToSrc = false;
    if (kUnpremul_PixelOpsFlag & pixelOpsFlags) {
        if (!GrPixelConfigIs8888(srcConfig)) {
            return false;
        }
        applyPremulToSrc = true;
    }

    GrGpu::DrawPreference drawPreference = GrGpu::kNoDraw_DrawPreference;
    // Don't prefer to draw for the conversion (and thereby access a texture from the cache) when
    // we've already determined that there isn't a roundtrip preserving conversion processor pair.
    if (applyPremulToSrc && !this->didFailPMUPMConversionTest()) {
        drawPreference = GrGpu::kCallerPrefersDraw_DrawPreference;
    }

    GrGpu::WritePixelTempDrawInfo tempDrawInfo;
    if (!fGpu->getWritePixelsInfo(surface, width, height, rowBytes, srcConfig, &drawPreference,
                                  &tempDrawInfo)) {
        return false;
    }

    if (!(kDontFlush_PixelOpsFlag & pixelOpsFlags) && surface->surfacePriv().hasPendingIO()) {
        this->flush();
    }

    SkAutoTUnref<GrTexture> tempTexture;
    if (GrGpu::kNoDraw_DrawPreference != drawPreference) {
        tempTexture.reset(this->textureProvider()->refScratchTexture(
            tempDrawInfo.fTempSurfaceDesc, GrTextureProvider::kApprox_ScratchTexMatch));
        if (!tempTexture && GrGpu::kRequireDraw_DrawPreference == drawPreference) {
            return false;
        }
    }

    // temp buffer for doing sw premul conversion, if needed.
    SkAutoSTMalloc<128 * 128, uint32_t> tmpPixels(0);
    if (tempTexture) {
        SkAutoTUnref<const GrFragmentProcessor> fp;
        SkMatrix textureMatrix;
        textureMatrix.setIDiv(tempTexture->width(), tempTexture->height());
        GrPaint paint;
        if (applyPremulToSrc) {
            fp.reset(this->createUPMToPMEffect(paint.getProcessorDataManager(), tempTexture,
                                               tempDrawInfo.fSwapRAndB, textureMatrix));
            // If premultiplying was the only reason for the draw, fall back to a straight write.
            if (!fp) {
                if (GrGpu::kCallerPrefersDraw_DrawPreference == drawPreference) {
                    tempTexture.reset(NULL);
                }
            } else {
                applyPremulToSrc = false;
            }
        }
        if (tempTexture) {
            if (!fp) {
                fp.reset(GrConfigConversionEffect::Create(
                    paint.getProcessorDataManager(), tempTexture, tempDrawInfo.fSwapRAndB,
                    GrConfigConversionEffect::kNone_PMConversion, textureMatrix));
                if (!fp) {
                    return false;
                }
            }
            GrRenderTarget* renderTarget = surface->asRenderTarget();
            SkASSERT(renderTarget);
            if (tempTexture->surfacePriv().hasPendingIO()) {
                this->flush();
            }
            if (applyPremulToSrc) {
                size_t tmpRowBytes = 4 * width;
                tmpPixels.reset(width * height);
                if (!sw_convert_to_premul(srcConfig, width, height, rowBytes, buffer, tmpRowBytes,
                                          tmpPixels.get())) {
                    return false;
                }
                rowBytes = tmpRowBytes;
                buffer = tmpPixels.get();
                applyPremulToSrc = false;
            }
            if (!fGpu->writePixels(tempTexture, 0, 0, width, height,
                                   tempDrawInfo.fTempSurfaceDesc.fConfig, buffer,
                                   rowBytes)) {
                return false;
            }
            SkMatrix matrix;
            matrix.setTranslate(SkIntToScalar(left), SkIntToScalar(top));
            GrDrawContext* drawContext = this->drawContext();
            if (!drawContext) {
                return false;
            }
            paint.addColorProcessor(fp);
            SkRect rect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
            drawContext->drawRect(renderTarget, GrClip::WideOpen(), paint, matrix, rect, NULL);

            if (kFlushWrites_PixelOp & pixelOpsFlags) {
                this->flushSurfaceWrites(surface);
            }
        }
    }
    if (!tempTexture) {
        if (applyPremulToSrc) {
            size_t tmpRowBytes = 4 * width;
            tmpPixels.reset(width * height);
            if (!sw_convert_to_premul(srcConfig, width, height, rowBytes, buffer, tmpRowBytes,
                                      tmpPixels.get())) {
                return false;
            }
            rowBytes = tmpRowBytes;
            buffer = tmpPixels.get();
            applyPremulToSrc = false;
        }
        return fGpu->writePixels(surface, left, top, width, height, srcConfig, buffer, rowBytes);
    }
    return true;
}

bool GrContext::readSurfacePixels(GrSurface* src,
                                  int left, int top, int width, int height,
                                  GrPixelConfig dstConfig, void* buffer, size_t rowBytes,
                                  uint32_t flags) {
    RETURN_FALSE_IF_ABANDONED
    ASSERT_OWNED_RESOURCE(src);
    SkASSERT(src);

    // Adjust the params so that if we wind up using an intermediate surface we've already done
    // all the trimming and the temporary can be the min size required.
    if (!GrSurfacePriv::AdjustReadPixelParams(src->width(), src->height(),
                                              GrBytesPerPixel(dstConfig), &left,
                                              &top, &width, &height, &buffer, &rowBytes)) {
        return false;
    }

    if (!(kDontFlush_PixelOpsFlag & flags) && src->surfacePriv().hasPendingWrite()) {
        this->flush();
    }

    bool unpremul = SkToBool(kUnpremul_PixelOpsFlag & flags);
    if (unpremul && !GrPixelConfigIs8888(dstConfig)) {
        // The unpremul flag is only allowed for 8888 configs.
        return false;
    }

    GrGpu::DrawPreference drawPreference = GrGpu::kNoDraw_DrawPreference;
    // Don't prefer to draw for the conversion (and thereby access a texture from the cache) when
    // we've already determined that there isn't a roundtrip preserving conversion processor pair.
    if (unpremul && !this->didFailPMUPMConversionTest()) {
        drawPreference = GrGpu::kCallerPrefersDraw_DrawPreference;
    }

    GrGpu::ReadPixelTempDrawInfo tempDrawInfo;
    if (!fGpu->getReadPixelsInfo(src, width, height, rowBytes, dstConfig, &drawPreference,
                                 &tempDrawInfo)) {
        return false;
    }

    SkAutoTUnref<GrSurface> surfaceToRead(SkRef(src));
    bool didTempDraw = false;
    if (GrGpu::kNoDraw_DrawPreference != drawPreference) {
        GrTextureProvider::ScratchTexMatch match = GrTextureProvider::kApprox_ScratchTexMatch;
        if (tempDrawInfo.fUseExactScratch) {
            // We only respect this when the entire src is being read. Otherwise we can trigger too
            // many odd ball texture sizes and trash the cache.
            if (width == src->width() && height == src->height()) {
                match = GrTextureProvider::kExact_ScratchTexMatch;
            }
        }
        SkAutoTUnref<GrTexture> temp;
        temp.reset(this->textureProvider()->refScratchTexture(tempDrawInfo.fTempSurfaceDesc,
                                                              match));
        if (temp) {
            SkMatrix textureMatrix;
            textureMatrix.setTranslate(SkIntToScalar(left), SkIntToScalar(top));
            textureMatrix.postIDiv(src->width(), src->height());
            GrPaint paint;
            SkAutoTUnref<const GrFragmentProcessor> fp;
            if (unpremul) {
                fp.reset(this->createPMToUPMEffect(
                    paint.getProcessorDataManager(), src->asTexture(), tempDrawInfo.fSwapRAndB,
                    textureMatrix));
                if (fp) {
                    unpremul = false; // we no longer need to do this on CPU after the read back.
                } else if (GrGpu::kCallerPrefersDraw_DrawPreference == drawPreference) {
                    // We only wanted to do the draw in order to perform the unpremul so don't
                    // bother.
                    temp.reset(NULL);
                }
            }
            if (!fp && temp) {
                fp.reset(GrConfigConversionEffect::Create(
                    paint.getProcessorDataManager(), src->asTexture(), tempDrawInfo.fSwapRAndB,
                    GrConfigConversionEffect::kNone_PMConversion, textureMatrix));
            }
            if (fp) {
                paint.addColorProcessor(fp);
                SkRect rect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
                GrDrawContext* drawContext = this->drawContext();
                drawContext->drawRect(temp->asRenderTarget(), GrClip::WideOpen(), paint,
                                      SkMatrix::I(), rect, NULL);
                surfaceToRead.reset(SkRef(temp.get()));
                left = 0;
                top = 0;
                didTempDraw = true;
            }
        }
    }

    if (GrGpu::kRequireDraw_DrawPreference == drawPreference && !didTempDraw) {
        return false;
    }
    GrPixelConfig configToRead = dstConfig;
    if (didTempDraw) {
        this->flushSurfaceWrites(surfaceToRead);
        // We swapped R and B while doing the temp draw. Swap back on the read.
        if (tempDrawInfo.fSwapRAndB) {
            configToRead = GrPixelConfigSwapRAndB(dstConfig);
        }
    }
    if (!fGpu->readPixels(surfaceToRead, left, top, width, height, configToRead, buffer,
                           rowBytes)) {
        return false;
    }

    // Perform umpremul conversion if we weren't able to perform it as a draw.
    if (unpremul) {
        SkDstPixelInfo dstPI;
        if (!GrPixelConfig2ColorAndProfileType(dstConfig, &dstPI.fColorType, NULL)) {
            return false;
        }
        dstPI.fAlphaType = kUnpremul_SkAlphaType;
        dstPI.fPixels = buffer;
        dstPI.fRowBytes = rowBytes;

        SkSrcPixelInfo srcPI;
        srcPI.fColorType = dstPI.fColorType;
        srcPI.fAlphaType = kPremul_SkAlphaType;
        srcPI.fPixels = buffer;
        srcPI.fRowBytes = rowBytes;

        return srcPI.convertPixelsTo(&dstPI, width, height);
    }
    return true;
}

void GrContext::prepareSurfaceForExternalIO(GrSurface* surface) {
    RETURN_IF_ABANDONED
    SkASSERT(surface);
    ASSERT_OWNED_RESOURCE(surface);
    if (surface->surfacePriv().hasPendingIO()) {
        this->flush();
    }
    GrRenderTarget* rt = surface->asRenderTarget();
    if (fGpu && rt) {
        fGpu->resolveRenderTarget(rt);
    }
}

void GrContext::copySurface(GrSurface* dst, GrSurface* src, const SkIRect& srcRect,
                            const SkIPoint& dstPoint, uint32_t pixelOpsFlags) {
    RETURN_IF_ABANDONED
    if (!src || !dst) {
        return;
    }
    ASSERT_OWNED_RESOURCE(src);
    ASSERT_OWNED_RESOURCE(dst);

    // Since we're going to the draw target and not GPU, no need to check kNoFlush
    // here.
    if (!dst->asRenderTarget()) {
        return;
    }

    GrDrawContext* drawContext = this->drawContext();
    if (!drawContext) {
        return;
    }

    drawContext->copySurface(dst->asRenderTarget(), src, srcRect, dstPoint);

    if (kFlushWrites_PixelOp & pixelOpsFlags) {
        this->flush();
    }
}

void GrContext::flushSurfaceWrites(GrSurface* surface) {
    RETURN_IF_ABANDONED
    if (surface->surfacePriv().hasPendingWrite()) {
        this->flush();
    }
}

/*
 * This method finds a path renderer that can draw the specified path on
 * the provided target.
 * Due to its expense, the software path renderer has split out so it can
 * can be individually allowed/disallowed via the "allowSW" boolean.
 */
GrPathRenderer* GrContext::getPathRenderer(const GrDrawTarget* target,
                                           const GrPipelineBuilder* pipelineBuilder,
                                           const SkMatrix& viewMatrix,
                                           const SkPath& path,
                                           const GrStrokeInfo& stroke,
                                           bool allowSW,
                                           GrPathRendererChain::DrawType drawType,
                                           GrPathRendererChain::StencilSupport* stencilSupport) {

    if (!fPathRendererChain) {
        fPathRendererChain = SkNEW_ARGS(GrPathRendererChain, (this));
    }

    GrPathRenderer* pr = fPathRendererChain->getPathRenderer(target,
                                                             pipelineBuilder,
                                                             viewMatrix,
                                                             path,
                                                             stroke,
                                                             drawType,
                                                             stencilSupport);

    if (!pr && allowSW) {
        if (!fSoftwarePathRenderer) {
            fSoftwarePathRenderer = SkNEW_ARGS(GrSoftwarePathRenderer, (this));
        }
        pr = fSoftwarePathRenderer;
    }

    return pr;
}

////////////////////////////////////////////////////////////////////////////////
int GrContext::getRecommendedSampleCount(GrPixelConfig config,
                                         SkScalar dpi) const {
    if (!this->caps()->isConfigRenderable(config, true)) {
        return 0;
    }
    int chosenSampleCount = 0;
    if (fGpu->caps()->shaderCaps()->pathRenderingSupport()) {
        if (dpi >= 250.0f) {
            chosenSampleCount = 4;
        } else {
            chosenSampleCount = 16;
        }
    }
    return chosenSampleCount <= fGpu->caps()->maxSampleCount() ?
        chosenSampleCount : 0;
}

namespace {
void test_pm_conversions(GrContext* ctx, int* pmToUPMValue, int* upmToPMValue) {
    GrConfigConversionEffect::PMConversion pmToUPM;
    GrConfigConversionEffect::PMConversion upmToPM;
    GrConfigConversionEffect::TestForPreservingPMConversions(ctx, &pmToUPM, &upmToPM);
    *pmToUPMValue = pmToUPM;
    *upmToPMValue = upmToPM;
}
}

const GrFragmentProcessor* GrContext::createPMToUPMEffect(GrProcessorDataManager* procDataManager,
                                                          GrTexture* texture,
                                                          bool swapRAndB,
                                                          const SkMatrix& matrix) {
    if (!fDidTestPMConversions) {
        test_pm_conversions(this, &fPMToUPMConversion, &fUPMToPMConversion);
        fDidTestPMConversions = true;
    }
    GrConfigConversionEffect::PMConversion pmToUPM =
        static_cast<GrConfigConversionEffect::PMConversion>(fPMToUPMConversion);
    if (GrConfigConversionEffect::kNone_PMConversion != pmToUPM) {
        return GrConfigConversionEffect::Create(procDataManager, texture, swapRAndB, pmToUPM,
                                                matrix);
    } else {
        return NULL;
    }
}

const GrFragmentProcessor* GrContext::createUPMToPMEffect(GrProcessorDataManager* procDataManager,
                                                          GrTexture* texture,
                                                          bool swapRAndB,
                                                          const SkMatrix& matrix) {
    if (!fDidTestPMConversions) {
        test_pm_conversions(this, &fPMToUPMConversion, &fUPMToPMConversion);
        fDidTestPMConversions = true;
    }
    GrConfigConversionEffect::PMConversion upmToPM =
        static_cast<GrConfigConversionEffect::PMConversion>(fUPMToPMConversion);
    if (GrConfigConversionEffect::kNone_PMConversion != upmToPM) {
        return GrConfigConversionEffect::Create(procDataManager, texture, swapRAndB, upmToPM,
                                                matrix);
    } else {
        return NULL;
    }
}

bool GrContext::didFailPMUPMConversionTest() const {
    // The PM<->UPM tests fail or succeed together so we only need to check one.
    return fDidTestPMConversions &&
           GrConfigConversionEffect::kNone_PMConversion == fPMToUPMConversion;
}

//////////////////////////////////////////////////////////////////////////////

void GrContext::getResourceCacheLimits(int* maxTextures, size_t* maxTextureBytes) const {
    if (maxTextures) {
        *maxTextures = fResourceCache->getMaxResourceCount();
    }
    if (maxTextureBytes) {
        *maxTextureBytes = fResourceCache->getMaxResourceBytes();
    }
}

void GrContext::setResourceCacheLimits(int maxTextures, size_t maxTextureBytes) {
    fResourceCache->setLimits(maxTextures, maxTextureBytes);
}

//////////////////////////////////////////////////////////////////////////////

void GrContext::addGpuTraceMarker(const GrGpuTraceMarker* marker) {
    fGpu->addGpuTraceMarker(marker);
}

void GrContext::removeGpuTraceMarker(const GrGpuTraceMarker* marker) {
    fGpu->removeGpuTraceMarker(marker);
}