1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "GrContext.h"
9 #include "GrDrawContext.h"
10 #include "GrYUVProvider.h"
11 #include "effects/GrGammaEffect.h"
12 #include "effects/GrYUVEffect.h"
13
14 #include "SkCachedData.h"
15 #include "SkRefCnt.h"
16 #include "SkResourceCache.h"
17 #include "SkYUVPlanesCache.h"
18
19 namespace {
20 /**
21 * Helper class to manage the resources used for storing the YUV planar data. Depending on the
22 * useCache option, we may find (and lock) the data in our ResourceCache, or we may have allocated
23 * it in scratch storage.
24 */
25 class YUVScoper {
26 public:
27 bool init(GrYUVProvider*, SkYUVPlanesCache::Info*, void* planes[3], bool useCache);
28
29 private:
30 // we only use one or the other of these
31 SkAutoTUnref<SkCachedData> fCachedData;
32 SkAutoMalloc fStorage;
33 };
34 }
35
init(GrYUVProvider * provider,SkYUVPlanesCache::Info * yuvInfo,void * planes[3],bool useCache)36 bool YUVScoper::init(GrYUVProvider* provider, SkYUVPlanesCache::Info* yuvInfo, void* planes[3],
37 bool useCache) {
38 if (useCache) {
39 fCachedData.reset(SkYUVPlanesCache::FindAndRef(provider->onGetID(), yuvInfo));
40 }
41
42 if (fCachedData.get()) {
43 planes[0] = (void*)fCachedData->data();
44 planes[1] = (uint8_t*)planes[0] + (yuvInfo->fSizeInfo.fWidthBytes[SkYUVSizeInfo::kY] *
45 yuvInfo->fSizeInfo.fSizes[SkYUVSizeInfo::kY].fHeight);
46 planes[2] = (uint8_t*)planes[1] + (yuvInfo->fSizeInfo.fWidthBytes[SkYUVSizeInfo::kU] *
47 yuvInfo->fSizeInfo.fSizes[SkYUVSizeInfo::kU].fHeight);
48 } else {
49 // Fetch yuv plane sizes for memory allocation.
50 if (!provider->onQueryYUV8(&yuvInfo->fSizeInfo, &yuvInfo->fColorSpace)) {
51 return false;
52 }
53
54 // Allocate the memory for YUV
55 size_t totalSize(0);
56 for (int i = 0; i < 3; i++) {
57 totalSize += yuvInfo->fSizeInfo.fWidthBytes[i] * yuvInfo->fSizeInfo.fSizes[i].fHeight;
58 }
59 if (useCache) {
60 fCachedData.reset(SkResourceCache::NewCachedData(totalSize));
61 planes[0] = fCachedData->writable_data();
62 } else {
63 fStorage.reset(totalSize);
64 planes[0] = fStorage.get();
65 }
66 planes[1] = (uint8_t*)planes[0] + (yuvInfo->fSizeInfo.fWidthBytes[SkYUVSizeInfo::kY] *
67 yuvInfo->fSizeInfo.fSizes[SkYUVSizeInfo::kY].fHeight);
68 planes[2] = (uint8_t*)planes[1] + (yuvInfo->fSizeInfo.fWidthBytes[SkYUVSizeInfo::kU] *
69 yuvInfo->fSizeInfo.fSizes[SkYUVSizeInfo::kU].fHeight);
70
71 // Get the YUV planes.
72 if (!provider->onGetYUV8Planes(yuvInfo->fSizeInfo, planes)) {
73 return false;
74 }
75
76 if (useCache) {
77 // Decoding is done, cache the resulting YUV planes
78 SkYUVPlanesCache::Add(provider->onGetID(), fCachedData, yuvInfo);
79 }
80 }
81 return true;
82 }
83
refAsTexture(GrContext * ctx,const GrSurfaceDesc & desc,bool useCache)84 sk_sp<GrTexture> GrYUVProvider::refAsTexture(GrContext* ctx,
85 const GrSurfaceDesc& desc,
86 bool useCache) {
87 SkYUVPlanesCache::Info yuvInfo;
88 void* planes[3];
89 YUVScoper scoper;
90 if (!scoper.init(this, &yuvInfo, planes, useCache)) {
91 return nullptr;
92 }
93
94 GrSurfaceDesc yuvDesc;
95 yuvDesc.fConfig = kAlpha_8_GrPixelConfig;
96 SkAutoTUnref<GrTexture> yuvTextures[3];
97 for (int i = 0; i < 3; i++) {
98 yuvDesc.fWidth = yuvInfo.fSizeInfo.fSizes[i].fWidth;
99 yuvDesc.fHeight = yuvInfo.fSizeInfo.fSizes[i].fHeight;
100 // TODO: why do we need this check?
101 bool needsExactTexture =
102 (yuvDesc.fWidth != yuvInfo.fSizeInfo.fSizes[SkYUVSizeInfo::kY].fWidth) ||
103 (yuvDesc.fHeight != yuvInfo.fSizeInfo.fSizes[SkYUVSizeInfo::kY].fHeight);
104 if (needsExactTexture) {
105 yuvTextures[i].reset(ctx->textureProvider()->createTexture(yuvDesc, SkBudgeted::kYes));
106 } else {
107 yuvTextures[i].reset(ctx->textureProvider()->createApproxTexture(yuvDesc));
108 }
109 if (!yuvTextures[i] ||
110 !yuvTextures[i]->writePixels(0, 0, yuvDesc.fWidth, yuvDesc.fHeight, yuvDesc.fConfig,
111 planes[i], yuvInfo.fSizeInfo.fWidthBytes[i])) {
112 return nullptr;
113 }
114 }
115
116 // We never want to perform color-space conversion during the decode
117 sk_sp<GrDrawContext> drawContext(ctx->makeDrawContext(SkBackingFit::kExact,
118 desc.fWidth, desc.fHeight,
119 desc.fConfig, nullptr,
120 desc.fSampleCnt));
121 if (!drawContext) {
122 return nullptr;
123 }
124
125 GrPaint paint;
126 sk_sp<GrFragmentProcessor> yuvToRgbProcessor(
127 GrYUVEffect::MakeYUVToRGB(yuvTextures[0], yuvTextures[1], yuvTextures[2],
128 yuvInfo.fSizeInfo.fSizes, yuvInfo.fColorSpace, false));
129 paint.addColorFragmentProcessor(std::move(yuvToRgbProcessor));
130
131 // If we're decoding an sRGB image, the result of our linear math on the YUV planes is already
132 // in sRGB. (The encoding is just math on bytes, with no concept of color spaces.) So, we need
133 // to output the results of that math directly to the buffer that we will then consider sRGB.
134 // If we have sRGB write control, we can just tell the HW not to do the Linear -> sRGB step.
135 // Otherwise, we do our shader math to go from YUV -> sRGB, manually convert sRGB -> Linear,
136 // then let the HW convert Linear -> sRGB.
137 if (GrPixelConfigIsSRGB(desc.fConfig)) {
138 if (ctx->caps()->srgbWriteControl()) {
139 paint.setDisableOutputConversionToSRGB(true);
140 } else {
141 paint.addColorFragmentProcessor(GrGammaEffect::Make(2.2f));
142 }
143 }
144
145 paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
146 const SkRect r = SkRect::MakeIWH(yuvInfo.fSizeInfo.fSizes[SkYUVSizeInfo::kY].fWidth,
147 yuvInfo.fSizeInfo.fSizes[SkYUVSizeInfo::kY].fHeight);
148
149 drawContext->drawRect(GrNoClip(), paint, SkMatrix::I(), r);
150
151 return drawContext->asTexture();
152 }
153