aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/gpu/SkGr.cpp
blob: 8f28d70ac46ca70337b0768ca7ab00a6fcd8dacc (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
/*
 * Copyright 2010 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#include "SkGr.h"
#include "SkGrPriv.h"

#include "GrCaps.h"
#include "GrContext.h"
#include "GrDrawContext.h"
#include "GrGpuResourcePriv.h"
#include "GrImageIDTextureAdjuster.h"
#include "GrTextureParamsAdjuster.h"
#include "GrTexturePriv.h"
#include "GrTypes.h"
#include "GrXferProcessor.h"
#include "GrYUVProvider.h"

#include "SkBlendModePriv.h"
#include "SkColorFilter.h"
#include "SkConfig8888.h"
#include "SkCanvas.h"
#include "SkData.h"
#include "SkMessageBus.h"
#include "SkMipMap.h"
#include "SkPixelRef.h"
#include "SkPM4fPriv.h"
#include "SkResourceCache.h"
#include "SkTemplates.h"
#include "SkYUVPlanesCache.h"
#include "effects/GrBicubicEffect.h"
#include "effects/GrConstColorProcessor.h"
#include "effects/GrDitherEffect.h"
#include "effects/GrPorterDuffXferProcessor.h"
#include "effects/GrXfermodeFragmentProcessor.h"
#include "effects/GrYUVEffect.h"

#ifndef SK_IGNORE_ETC1_SUPPORT
#  include "ktx.h"
#  include "etc1.h"
#endif

GrSurfaceDesc GrImageInfoToSurfaceDesc(const SkImageInfo& info, const GrCaps& caps) {
    GrSurfaceDesc desc;
    desc.fFlags = kNone_GrSurfaceFlags;
    desc.fWidth = info.width();
    desc.fHeight = info.height();
    desc.fConfig = SkImageInfo2GrPixelConfig(info, caps);
    desc.fSampleCnt = 0;
    return desc;
}

void GrMakeKeyFromImageID(GrUniqueKey* key, uint32_t imageID, const SkIRect& imageBounds) {
    SkASSERT(key);
    SkASSERT(imageID);
    SkASSERT(!imageBounds.isEmpty());
    static const GrUniqueKey::Domain kImageIDDomain = GrUniqueKey::GenerateDomain();
    GrUniqueKey::Builder builder(key, kImageIDDomain, 5);
    builder[0] = imageID;
    builder[1] = imageBounds.fLeft;
    builder[2] = imageBounds.fTop;
    builder[3] = imageBounds.fRight;
    builder[4] = imageBounds.fBottom;
}

GrPixelConfig GrIsCompressedTextureDataSupported(GrContext* ctx, SkData* data,
                                                 int expectedW, int expectedH,
                                                 const void** outStartOfDataToUpload) {
    *outStartOfDataToUpload = nullptr;
#ifndef SK_IGNORE_ETC1_SUPPORT
    if (!ctx->caps()->isConfigTexturable(kETC1_GrPixelConfig)) {
        return kUnknown_GrPixelConfig;
    }

    const uint8_t* bytes = data->bytes();
    if (data->size() > ETC_PKM_HEADER_SIZE && etc1_pkm_is_valid(bytes)) {
        // Does the data match the dimensions of the bitmap? If not,
        // then we don't know how to scale the image to match it...
        if (etc1_pkm_get_width(bytes) != (unsigned)expectedW ||
            etc1_pkm_get_height(bytes) != (unsigned)expectedH)
        {
            return kUnknown_GrPixelConfig;
        }

        *outStartOfDataToUpload = bytes + ETC_PKM_HEADER_SIZE;
        return kETC1_GrPixelConfig;
    } else if (SkKTXFile::is_ktx(bytes, data->size())) {
        SkKTXFile ktx(data);

        // Is it actually an ETC1 texture?
        if (!ktx.isCompressedFormat(SkTextureCompressor::kETC1_Format)) {
            return kUnknown_GrPixelConfig;
        }

        // Does the data match the dimensions of the bitmap? If not,
        // then we don't know how to scale the image to match it...
        if (ktx.width() != expectedW || ktx.height() != expectedH) {
            return kUnknown_GrPixelConfig;
        }

        *outStartOfDataToUpload = ktx.pixelData();
        return kETC1_GrPixelConfig;
    }
#endif
    return kUnknown_GrPixelConfig;
}

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

/**
 * Fill out buffer with the compressed format Ganesh expects from a colortable
 * based bitmap. [palette (colortable) + indices].
 *
 * At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
 * we could detect that the colortable.count is <= 16, and then repack the
 * indices as nibbles to save RAM, but it would take more time (i.e. a lot
 * slower than memcpy), so skipping that for now.
 *
 * Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
 * as the colortable.count says it is.
 */
static void build_index8_data(void* buffer, const SkPixmap& pixmap) {
    SkASSERT(kIndex_8_SkColorType == pixmap.colorType());

    const SkColorTable* ctable = pixmap.ctable();
    char* dst = (char*)buffer;

    const int count = ctable->count();

    SkDstPixelInfo dstPI;
    dstPI.fColorType = kRGBA_8888_SkColorType;
    dstPI.fAlphaType = kPremul_SkAlphaType;
    dstPI.fPixels = buffer;
    dstPI.fRowBytes = count * sizeof(SkPMColor);

    SkSrcPixelInfo srcPI;
    srcPI.fColorType = kN32_SkColorType;
    srcPI.fAlphaType = kPremul_SkAlphaType;
    srcPI.fPixels = ctable->readColors();
    srcPI.fRowBytes = count * sizeof(SkPMColor);

    srcPI.convertPixelsTo(&dstPI, count, 1);

    // always skip a full 256 number of entries, even if we memcpy'd fewer
    dst += 256 * sizeof(GrColor);

    if ((unsigned)pixmap.width() == pixmap.rowBytes()) {
        memcpy(dst, pixmap.addr(), pixmap.getSafeSize());
    } else {
        // need to trim off the extra bytes per row
        size_t width = pixmap.width();
        size_t rowBytes = pixmap.rowBytes();
        const uint8_t* src = pixmap.addr8();
        for (int y = 0; y < pixmap.height(); y++) {
            memcpy(dst, src, width);
            src += rowBytes;
            dst += width;
        }
    }
}

/**
 *  Once we have made SkImages handle all lazy/deferred/generated content, the YUV apis will
 *  be gone from SkPixelRef, and we can remove this subclass entirely.
 */
class PixelRef_GrYUVProvider : public GrYUVProvider {
    SkPixelRef* fPR;

public:
    PixelRef_GrYUVProvider(SkPixelRef* pr) : fPR(pr) {}

    uint32_t onGetID() override { return fPR->getGenerationID(); }
    bool onQueryYUV8(SkYUVSizeInfo* sizeInfo, SkYUVColorSpace* colorSpace) const override {
        return fPR->queryYUV8(sizeInfo, colorSpace);
    }
    bool onGetYUV8Planes(const SkYUVSizeInfo& sizeInfo, void* planes[3]) override {
        return fPR->getYUV8Planes(sizeInfo, planes);
    }
};

static sk_sp<GrTexture> create_texture_from_yuv(GrContext* ctx, const SkBitmap& bm,
                                                const GrSurfaceDesc& desc) {
    // Subsets are not supported, the whole pixelRef is loaded when using YUV decoding
    SkPixelRef* pixelRef = bm.pixelRef();
    if ((nullptr == pixelRef) ||
        (pixelRef->info().width() != bm.info().width()) ||
        (pixelRef->info().height() != bm.info().height())) {
        return nullptr;
    }

    PixelRef_GrYUVProvider provider(pixelRef);

    return provider.refAsTexture(ctx, desc, !bm.isVolatile());
}

static GrTexture* load_etc1_texture(GrContext* ctx, const SkBitmap &bm, GrSurfaceDesc desc) {
    sk_sp<SkData> data(bm.pixelRef()->refEncodedData());
    if (!data) {
        return nullptr;
    }

    const void* startOfTexData;
    desc.fConfig = GrIsCompressedTextureDataSupported(ctx, data.get(), bm.width(), bm.height(),
                                                      &startOfTexData);
    if (kUnknown_GrPixelConfig == desc.fConfig) {
        return nullptr;
    }

    return ctx->textureProvider()->createTexture(desc, SkBudgeted::kYes, startOfTexData, 0);
}

GrTexture* GrUploadBitmapToTexture(GrContext* ctx, const SkBitmap& bitmap) {
    GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bitmap.info(), *ctx->caps());
    if (GrTexture *texture = load_etc1_texture(ctx, bitmap, desc)) {
        return texture;
    }

    sk_sp<GrTexture> texture(create_texture_from_yuv(ctx, bitmap, desc));
    if (texture) {
        return texture.release();
    }

    SkAutoLockPixels alp(bitmap);
    if (!bitmap.readyToDraw()) {
        return nullptr;
    }
    SkPixmap pixmap;
    if (!bitmap.peekPixels(&pixmap)) {
        return nullptr;
    }
    return GrUploadPixmapToTexture(ctx, pixmap, SkBudgeted::kYes);
}

GrTexture* GrUploadPixmapToTexture(GrContext* ctx, const SkPixmap& pixmap, SkBudgeted budgeted) {
    const SkPixmap* pmap = &pixmap;
    SkPixmap tmpPixmap;
    SkBitmap tmpBitmap;

    const GrCaps* caps = ctx->caps();
    GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(pixmap.info(), *caps);

    if (caps->srgbSupport() &&
        pixmap.info().colorSpace() && pixmap.info().colorSpace()->gammaCloseToSRGB() &&
        !(GrPixelConfigIsSRGB(desc.fConfig) ||
          kRGBA_half_GrPixelConfig == desc.fConfig ||
          kRGBA_float_GrPixelConfig == desc.fConfig)) {
        // We were supplied an sRGB-like color space, but we don't have a suitable pixel config.
        // Convert to 8888 sRGB so we can handle the data correctly. The raster backend doesn't
        // handle sRGB Index8 -> sRGB 8888 correctly (yet), so lie about both the source and
        // destination (claim they're linear):
        SkImageInfo linSrcInfo = SkImageInfo::Make(pixmap.width(), pixmap.height(),
                                                   pixmap.colorType(), pixmap.alphaType());
        SkPixmap linSrcPixmap(linSrcInfo, pixmap.addr(), pixmap.rowBytes(), pixmap.ctable());

        SkImageInfo dstInfo = SkImageInfo::Make(pixmap.width(), pixmap.height(),
                                                kN32_SkColorType, kPremul_SkAlphaType,
                                                sk_ref_sp(pixmap.info().colorSpace()));

        tmpBitmap.allocPixels(dstInfo);

        SkImageInfo linDstInfo = SkImageInfo::MakeN32Premul(pixmap.width(), pixmap.height());
        if (!linSrcPixmap.readPixels(linDstInfo, tmpBitmap.getPixels(), tmpBitmap.rowBytes())) {
            return nullptr;
        }
        if (!tmpBitmap.peekPixels(&tmpPixmap)) {
            return nullptr;
        }
        pmap = &tmpPixmap;
        // must rebuild desc, since we've forced the info to be N32
        desc = GrImageInfoToSurfaceDesc(pmap->info(), *caps);
    } else if (kGray_8_SkColorType == pixmap.colorType()) {
        // We don't have Gray8 support as a pixel config, so expand to 8888

        // We should have converted sRGB Gray8 above (if we have sRGB support):
        SkASSERT(!caps->srgbSupport() || !pixmap.info().colorSpace() ||
                 !pixmap.info().colorSpace()->gammaCloseToSRGB());

        SkImageInfo info = SkImageInfo::MakeN32(pixmap.width(), pixmap.height(),
                                                kOpaque_SkAlphaType);
        tmpBitmap.allocPixels(info);
        if (!pixmap.readPixels(info, tmpBitmap.getPixels(), tmpBitmap.rowBytes())) {
            return nullptr;
        }
        if (!tmpBitmap.peekPixels(&tmpPixmap)) {
            return nullptr;
        }
        pmap = &tmpPixmap;
        // must rebuild desc, since we've forced the info to be N32
        desc = GrImageInfoToSurfaceDesc(pmap->info(), *caps);
    } else if (kIndex_8_SkColorType == pixmap.colorType()) {
        if (caps->isConfigTexturable(kIndex_8_GrPixelConfig)) {
            size_t imageSize = GrCompressedFormatDataSize(kIndex_8_GrPixelConfig,
                                                          pixmap.width(), pixmap.height());
            SkAutoMalloc storage(imageSize);
            build_index8_data(storage.get(), pixmap);

            // our compressed data will be trimmed, so pass width() for its
            // "rowBytes", since they are the same now.
            return ctx->textureProvider()->createTexture(desc, budgeted, storage.get(),
                                                         pixmap.width());
        } else {
            SkImageInfo info = SkImageInfo::MakeN32Premul(pixmap.width(), pixmap.height());
            tmpBitmap.allocPixels(info);
            if (!pixmap.readPixels(info, tmpBitmap.getPixels(), tmpBitmap.rowBytes())) {
                return nullptr;
            }
            if (!tmpBitmap.peekPixels(&tmpPixmap)) {
                return nullptr;
            }
            pmap = &tmpPixmap;
            // must rebuild desc, since we've forced the info to be N32
            desc = GrImageInfoToSurfaceDesc(pmap->info(), *caps);
        }
    }

    return ctx->textureProvider()->createTexture(desc, budgeted, pmap->addr(),
                                                 pmap->rowBytes());
}


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

void GrInstallBitmapUniqueKeyInvalidator(const GrUniqueKey& key, SkPixelRef* pixelRef) {
    class Invalidator : public SkPixelRef::GenIDChangeListener {
    public:
        explicit Invalidator(const GrUniqueKey& key) : fMsg(key) {}
    private:
        GrUniqueKeyInvalidatedMessage fMsg;

        void onChange() override { SkMessageBus<GrUniqueKeyInvalidatedMessage>::Post(fMsg); }
    };

    pixelRef->addGenIDChangeListener(new Invalidator(key));
}

GrTexture* GrGenerateMipMapsAndUploadToTexture(GrContext* ctx, const SkBitmap& bitmap,
                                               SkSourceGammaTreatment gammaTreatment)
{
    GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bitmap.info(), *ctx->caps());
    if (kIndex_8_SkColorType != bitmap.colorType() && !bitmap.readyToDraw()) {
        GrTexture* texture = load_etc1_texture(ctx, bitmap, desc);
        if (texture) {
            return texture;
        }
    }

    sk_sp<GrTexture> texture(create_texture_from_yuv(ctx, bitmap, desc));
    if (texture) {
        return texture.release();
    }

    // We don't support Gray8 directly in the GL backend, so fail-over to GrUploadBitmapToTexture.
    // That will transform the Gray8 to 8888, then use the driver/GPU to build mipmaps. If we build
    // the mips on the CPU here, they'll all be Gray8, which isn't useful. (They get treated as A8).
    // TODO: A better option might be to transform the initial bitmap here to 8888, then run the
    // CPU mip-mapper on that data before uploading. This is much less code for a rare case though:
    if (kGray_8_SkColorType == bitmap.colorType()) {
        return nullptr;
    }

    SkASSERT(sizeof(int) <= sizeof(uint32_t));
    if (bitmap.width() < 0 || bitmap.height() < 0) {
        return nullptr;
    }

    SkAutoPixmapUnlock srcUnlocker;
    if (!bitmap.requestLock(&srcUnlocker)) {
        return nullptr;
    }
    const SkPixmap& pixmap = srcUnlocker.pixmap();
    // Try to catch where we might have returned nullptr for src crbug.com/492818
    if (nullptr == pixmap.addr()) {
        sk_throw();
    }

    SkAutoTDelete<SkMipMap> mipmaps(SkMipMap::Build(pixmap, gammaTreatment, nullptr));
    if (!mipmaps) {
        return nullptr;
    }

    const int mipLevelCount = mipmaps->countLevels() + 1;
    if (mipLevelCount < 1) {
        return nullptr;
    }

    const bool isMipMapped = mipLevelCount > 1;
    desc.fIsMipMapped = isMipMapped;

    SkAutoTDeleteArray<GrMipLevel> texels(new GrMipLevel[mipLevelCount]);

    texels[0].fPixels = pixmap.addr();
    texels[0].fRowBytes = pixmap.rowBytes();

    for (int i = 1; i < mipLevelCount; ++i) {
        SkMipMap::Level generatedMipLevel;
        mipmaps->getLevel(i - 1, &generatedMipLevel);
        texels[i].fPixels = generatedMipLevel.fPixmap.addr();
        texels[i].fRowBytes = generatedMipLevel.fPixmap.rowBytes();
    }

    {
        GrTexture* texture = ctx->textureProvider()->createMipMappedTexture(desc,
                                                                            SkBudgeted::kYes,
                                                                            texels.get(),
                                                                            mipLevelCount);
        if (texture) {
            texture->texturePriv().setGammaTreatment(gammaTreatment);
        }
        return texture;
    }
}

GrTexture* GrUploadMipMapToTexture(GrContext* ctx, const SkImageInfo& info,
                                   const GrMipLevel* texels, int mipLevelCount) {
    const GrCaps* caps = ctx->caps();
    return ctx->textureProvider()->createMipMappedTexture(GrImageInfoToSurfaceDesc(info, *caps),
                                                          SkBudgeted::kYes, texels,
                                                          mipLevelCount);
}

GrTexture* GrRefCachedBitmapTexture(GrContext* ctx, const SkBitmap& bitmap,
                                    const GrTextureParams& params,
                                    SkSourceGammaTreatment gammaTreatment) {
    return GrBitmapTextureMaker(ctx, bitmap).refTextureForParams(params, gammaTreatment);
}

sk_sp<GrTexture> GrMakeCachedBitmapTexture(GrContext* ctx, const SkBitmap& bitmap,
                                           const GrTextureParams& params,
                                           SkSourceGammaTreatment gammaTreatment) {
    GrTexture* tex = GrBitmapTextureMaker(ctx, bitmap).refTextureForParams(params, gammaTreatment);
    return sk_sp<GrTexture>(tex);
}

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

GrColor4f SkColorToPremulGrColor4f(SkColor c, bool gammaCorrect, GrColorSpaceXform* gamutXform) {
    // We want to premultiply after linearizing, so this is easy:
    return SkColorToUnpremulGrColor4f(c, gammaCorrect, gamutXform).premul();
}

GrColor4f SkColorToUnpremulGrColor4f(SkColor c, bool gammaCorrect, GrColorSpaceXform* gamutXform) {
    // You can't be color-space aware in legacy mode
    SkASSERT(gammaCorrect || !gamutXform);

    GrColor4f color;
    if (gammaCorrect) {
        // SkColor4f::FromColor does sRGB -> Linear
        color = GrColor4f::FromSkColor4f(SkColor4f::FromColor(c));
    } else {
        // GrColor4f::FromGrColor just multiplies by 1/255
        color = GrColor4f::FromGrColor(SkColorToUnpremulGrColor(c));
    }

    if (gamutXform) {
        color = gamutXform->apply(color);
    }

    return color;
}

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

// alphatype is ignore for now, but if GrPixelConfig is expanded to encompass
// alpha info, that will be considered.
GrPixelConfig SkImageInfo2GrPixelConfig(SkColorType ct, SkAlphaType, const SkColorSpace* cs,
                                        const GrCaps& caps) {
    // We intentionally ignore profile type for non-8888 formats. Anything we can't support
    // in hardware will be expanded to sRGB 8888 in GrUploadPixmapToTexture.
    switch (ct) {
        case kUnknown_SkColorType:
            return kUnknown_GrPixelConfig;
        case kAlpha_8_SkColorType:
            return kAlpha_8_GrPixelConfig;
        case kRGB_565_SkColorType:
            return kRGB_565_GrPixelConfig;
        case kARGB_4444_SkColorType:
            return kRGBA_4444_GrPixelConfig;
        case kRGBA_8888_SkColorType:
            return (caps.srgbSupport() && cs && cs->gammaCloseToSRGB())
                   ? kSRGBA_8888_GrPixelConfig : kRGBA_8888_GrPixelConfig;
        case kBGRA_8888_SkColorType:
            return (caps.srgbSupport() && cs && cs->gammaCloseToSRGB())
                   ? kSBGRA_8888_GrPixelConfig : kBGRA_8888_GrPixelConfig;
        case kIndex_8_SkColorType:
            return kIndex_8_GrPixelConfig;
        case kGray_8_SkColorType:
            return kAlpha_8_GrPixelConfig; // TODO: gray8 support on gpu
        case kRGBA_F16_SkColorType:
            return kRGBA_half_GrPixelConfig;
    }
    SkASSERT(0);    // shouldn't get here
    return kUnknown_GrPixelConfig;
}

bool GrPixelConfigToColorType(GrPixelConfig config, SkColorType* ctOut) {
    SkColorType ct;
    switch (config) {
        case kAlpha_8_GrPixelConfig:
            ct = kAlpha_8_SkColorType;
            break;
        case kIndex_8_GrPixelConfig:
            ct = kIndex_8_SkColorType;
            break;
        case kRGB_565_GrPixelConfig:
            ct = kRGB_565_SkColorType;
            break;
        case kRGBA_4444_GrPixelConfig:
            ct = kARGB_4444_SkColorType;
            break;
        case kRGBA_8888_GrPixelConfig:
            ct = kRGBA_8888_SkColorType;
            break;
        case kBGRA_8888_GrPixelConfig:
            ct = kBGRA_8888_SkColorType;
            break;
        case kSRGBA_8888_GrPixelConfig:
            ct = kRGBA_8888_SkColorType;
            break;
        case kSBGRA_8888_GrPixelConfig:
            ct = kBGRA_8888_SkColorType;
            break;
        case kRGBA_half_GrPixelConfig:
            ct = kRGBA_F16_SkColorType;
            break;
        default:
            return false;
    }
    if (ctOut) {
        *ctOut = ct;
    }
    return true;
}

GrPixelConfig GrRenderableConfigForColorSpace(const SkColorSpace* colorSpace) {
    if (!colorSpace) {
        return kRGBA_8888_GrPixelConfig;
    } else if (colorSpace->gammaIsLinear()) {
        return kRGBA_half_GrPixelConfig;
    } else if (colorSpace->gammaCloseToSRGB()) {
        return kSRGBA_8888_GrPixelConfig;
    } else {
        SkDEBUGFAIL("No renderable config exists for color space with strange gamma");
        return kUnknown_GrPixelConfig;
    }
}

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

static inline bool blend_requires_shader(const SkXfermode::Mode mode, bool primitiveIsSrc) {
    if (primitiveIsSrc) {
        return SkXfermode::kSrc_Mode != mode;
    } else {
        return SkXfermode::kDst_Mode != mode;
    }
}

static inline bool skpaint_to_grpaint_impl(GrContext* context,
                                           GrDrawContext* dc,
                                           const SkPaint& skPaint,
                                           const SkMatrix& viewM,
                                           sk_sp<GrFragmentProcessor>* shaderProcessor,
                                           SkXfermode::Mode* primColorMode,
                                           bool primitiveIsSrc,
                                           GrPaint* grPaint) {
    grPaint->setAntiAlias(skPaint.isAntiAlias());
    grPaint->setAllowSRGBInputs(dc->isGammaCorrect());

    // Convert SkPaint color to 4f format, including optional linearizing and gamut conversion.
    GrColor4f origColor = SkColorToUnpremulGrColor4f(skPaint.getColor(), dc->isGammaCorrect(),
                                                     dc->getColorXformFromSRGB());

    // Setup the initial color considering the shader, the SkPaint color, and the presence or not
    // of per-vertex colors.
    sk_sp<GrFragmentProcessor> shaderFP;
    if (!primColorMode || blend_requires_shader(*primColorMode, primitiveIsSrc)) {
        if (shaderProcessor) {
            shaderFP = *shaderProcessor;
        } else if (const SkShader* shader = skPaint.getShader()) {
            shaderFP = shader->asFragmentProcessor(SkShader::AsFPArgs(context, &viewM, nullptr,
                                                                      skPaint.getFilterQuality(),
                                                                      dc->getColorSpace(),
                                                                      dc->sourceGammaTreatment()));
            if (!shaderFP) {
                return false;
            }
        }
    }

    // Set this in below cases if the output of the shader/paint-color/paint-alpha/primXfermode is
    // a known constant value. In that case we can simply apply a color filter during this
    // conversion without converting the color filter to a GrFragmentProcessor.
    bool applyColorFilterToPaintColor = false;
    if (shaderFP) {
        if (primColorMode) {
            // There is a blend between the primitive color and the shader color. The shader sees
            // the opaque paint color. The shader's output is blended using the provided mode by
            // the primitive color. The blended color is then modulated by the paint's alpha.

            // The geometry processor will insert the primitive color to start the color chain, so
            // the GrPaint color will be ignored.

            GrColor4f shaderInput = origColor.opaque();
            shaderFP = GrFragmentProcessor::OverrideInput(shaderFP, shaderInput);
            if (primitiveIsSrc) {
                shaderFP = GrXfermodeFragmentProcessor::MakeFromDstProcessor(std::move(shaderFP),
                                                                             *primColorMode);
            } else {
                shaderFP = GrXfermodeFragmentProcessor::MakeFromSrcProcessor(std::move(shaderFP),
                                                                             *primColorMode);
            }
            // The above may return null if compose results in a pass through of the prim color.
            if (shaderFP) {
                grPaint->addColorFragmentProcessor(shaderFP);
            }

            // We can ignore origColor here - alpha is unchanged by gamma
            GrColor paintAlpha = SkColorAlphaToGrColor(skPaint.getColor());
            if (GrColor_WHITE != paintAlpha) {
                grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
                    paintAlpha, GrConstColorProcessor::kModulateRGBA_InputMode));
            }
        } else {
            // The shader's FP sees the paint unpremul color
            grPaint->setColor4f(origColor);
            grPaint->addColorFragmentProcessor(std::move(shaderFP));
        }
    } else {
        if (primColorMode) {
            // There is a blend between the primitive color and the paint color. The blend considers
            // the opaque paint color. The paint's alpha is applied to the post-blended color.
            // SRGBTODO: Preserve 4f on this code path
            sk_sp<GrFragmentProcessor> processor(
                GrConstColorProcessor::Make(origColor.opaque().toGrColor(),
                                              GrConstColorProcessor::kIgnore_InputMode));
            if (primitiveIsSrc) {
                processor = GrXfermodeFragmentProcessor::MakeFromDstProcessor(std::move(processor),
                                                                              *primColorMode);
            } else {
                processor = GrXfermodeFragmentProcessor::MakeFromSrcProcessor(std::move(processor),
                                                                              *primColorMode);
            }
            if (processor) {
                grPaint->addColorFragmentProcessor(std::move(processor));
            }

            grPaint->setColor4f(origColor.opaque());

            // We can ignore origColor here - alpha is unchanged by gamma
            GrColor paintAlpha = SkColorAlphaToGrColor(skPaint.getColor());
            if (GrColor_WHITE != paintAlpha) {
                grPaint->addColorFragmentProcessor(GrConstColorProcessor::Make(
                    paintAlpha, GrConstColorProcessor::kModulateRGBA_InputMode));
            }
        } else {
            // No shader, no primitive color.
            grPaint->setColor4f(origColor.premul());
            applyColorFilterToPaintColor = true;
        }
    }

    SkColorFilter* colorFilter = skPaint.getColorFilter();
    if (colorFilter) {
        if (applyColorFilterToPaintColor) {
            grPaint->setColor4f(GrColor4f::FromSkColor4f(
                colorFilter->filterColor4f(origColor.toSkColor4f())).premul());
        } else {
            sk_sp<GrFragmentProcessor> cfFP(colorFilter->asFragmentProcessor(context));
            if (cfFP) {
                grPaint->addColorFragmentProcessor(std::move(cfFP));
            } else {
                return false;
            }
        }
    }

    // When the xfermode is null on the SkPaint (meaning kSrcOver) we need the XPFactory field on
    // the GrPaint to also be null (also kSrcOver).
    SkASSERT(!grPaint->getXPFactory());
    if (!skPaint.isSrcOver()) {
        grPaint->setXPFactory(SkBlendMode_AsXPFactory(skPaint.getBlendMode()));
    }

#ifndef SK_IGNORE_GPU_DITHER
    if (skPaint.isDither() && grPaint->numColorFragmentProcessors() > 0 && !dc->isGammaCorrect()) {
        grPaint->addColorFragmentProcessor(GrDitherEffect::Make());
    }
#endif
    return true;
}

bool SkPaintToGrPaint(GrContext* context, GrDrawContext* dc, const SkPaint& skPaint,
                      const SkMatrix& viewM, GrPaint* grPaint) {
    return skpaint_to_grpaint_impl(context, dc, skPaint, viewM, nullptr, nullptr, false, grPaint);
}

/** Replaces the SkShader (if any) on skPaint with the passed in GrFragmentProcessor. */
bool SkPaintToGrPaintReplaceShader(GrContext* context,
                                   GrDrawContext* dc,
                                   const SkPaint& skPaint,
                                   sk_sp<GrFragmentProcessor> shaderFP,
                                   GrPaint* grPaint) {
    if (!shaderFP) {
        return false;
    }
    return skpaint_to_grpaint_impl(context, dc, skPaint, SkMatrix::I(), &shaderFP, nullptr, false,
                                   grPaint);
}

/** Ignores the SkShader (if any) on skPaint. */
bool SkPaintToGrPaintNoShader(GrContext* context,
                              GrDrawContext* dc,
                              const SkPaint& skPaint,
                              GrPaint* grPaint) {
    // Use a ptr to a nullptr to to indicate that the SkShader is ignored and not replaced.
    static sk_sp<GrFragmentProcessor> kNullShaderFP(nullptr);
    static sk_sp<GrFragmentProcessor>* kIgnoreShader = &kNullShaderFP;
    return skpaint_to_grpaint_impl(context, dc, skPaint, SkMatrix::I(), kIgnoreShader, nullptr,
                                   false, grPaint);
}

/** Blends the SkPaint's shader (or color if no shader) with a per-primitive color which must
be setup as a vertex attribute using the specified SkXfermode::Mode. */
bool SkPaintToGrPaintWithXfermode(GrContext* context,
                                  GrDrawContext* dc,
                                  const SkPaint& skPaint,
                                  const SkMatrix& viewM,
                                  SkXfermode::Mode primColorMode,
                                  bool primitiveIsSrc,
                                  GrPaint* grPaint) {
    return skpaint_to_grpaint_impl(context, dc, skPaint, viewM, nullptr, &primColorMode,
                                   primitiveIsSrc, grPaint);
}

bool SkPaintToGrPaintWithTexture(GrContext* context,
                                 GrDrawContext* dc,
                                 const SkPaint& paint,
                                 const SkMatrix& viewM,
                                 sk_sp<GrFragmentProcessor> fp,
                                 bool textureIsAlphaOnly,
                                 GrPaint* grPaint) {
    sk_sp<GrFragmentProcessor> shaderFP;
    if (textureIsAlphaOnly) {
        if (const SkShader* shader = paint.getShader()) {
            shaderFP = shader->asFragmentProcessor(SkShader::AsFPArgs(context,
                                                                      &viewM,
                                                                      nullptr,
                                                                      paint.getFilterQuality(),
                                                                      dc->getColorSpace(),
                                                                      dc->sourceGammaTreatment()));
            if (!shaderFP) {
                return false;
            }
            sk_sp<GrFragmentProcessor> fpSeries[] = { std::move(shaderFP), std::move(fp) };
            shaderFP = GrFragmentProcessor::RunInSeries(fpSeries, 2);
        } else {
            shaderFP = GrFragmentProcessor::MulOutputByInputUnpremulColor(fp);
        }
    } else {
        shaderFP = GrFragmentProcessor::MulOutputByInputAlpha(fp);
    }

    return SkPaintToGrPaintReplaceShader(context, dc, paint, std::move(shaderFP), grPaint);
}


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

GrTextureParams::FilterMode GrSkFilterQualityToGrFilterMode(SkFilterQuality paintFilterQuality,
                                                            const SkMatrix& viewM,
                                                            const SkMatrix& localM,
                                                            bool* doBicubic) {
    *doBicubic = false;
    GrTextureParams::FilterMode textureFilterMode;
    switch (paintFilterQuality) {
        case kNone_SkFilterQuality:
            textureFilterMode = GrTextureParams::kNone_FilterMode;
            break;
        case kLow_SkFilterQuality:
            textureFilterMode = GrTextureParams::kBilerp_FilterMode;
            break;
        case kMedium_SkFilterQuality: {
            SkMatrix matrix;
            matrix.setConcat(viewM, localM);
            if (matrix.getMinScale() < SK_Scalar1) {
                textureFilterMode = GrTextureParams::kMipMap_FilterMode;
            } else {
                // Don't trigger MIP level generation unnecessarily.
                textureFilterMode = GrTextureParams::kBilerp_FilterMode;
            }
            break;
        }
        case kHigh_SkFilterQuality: {
            SkMatrix matrix;
            matrix.setConcat(viewM, localM);
            *doBicubic = GrBicubicEffect::ShouldUseBicubic(matrix, &textureFilterMode);
            break;
        }
        default:
            // Should be unreachable.  If not, fall back to mipmaps.
            textureFilterMode = GrTextureParams::kMipMap_FilterMode;
            break;

    }
    return textureFilterMode;
}