GrPaint.cpp revision 37b4d866b1446d35c989f9a97885a777ddc7d1c8 
1
2/*
3 * Copyright 2013 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9#include "GrPaint.h"
10
11#include "GrBlend.h"
12#include "effects/GrSimpleTextureEffect.h"
13
14void GrPaint::addColorTextureProcessor(GrTexture* texture, const SkMatrix& matrix) {
15    this->addColorProcessor(GrSimpleTextureEffect::Create(texture, matrix))->unref();
16}
17
18void GrPaint::addCoverageTextureProcessor(GrTexture* texture, const SkMatrix& matrix) {
19    this->addCoverageProcessor(GrSimpleTextureEffect::Create(texture, matrix))->unref();
20}
21
22void GrPaint::addColorTextureProcessor(GrTexture* texture,
23                                    const SkMatrix& matrix,
24                                    const GrTextureParams& params) {
25    this->addColorProcessor(GrSimpleTextureEffect::Create(texture, matrix, params))->unref();
26}
27
28void GrPaint::addCoverageTextureProcessor(GrTexture* texture,
29                                       const SkMatrix& matrix,
30                                       const GrTextureParams& params) {
31    this->addCoverageProcessor(GrSimpleTextureEffect::Create(texture, matrix, params))->unref();
32}
33
34bool GrPaint::isOpaque() const {
35    return this->getOpaqueAndKnownColor(NULL, NULL);
36}
37
38bool GrPaint::isOpaqueAndConstantColor(GrColor* color) const {
39    GrColor tempColor;
40    uint32_t colorComps;
41    if (this->getOpaqueAndKnownColor(&tempColor, &colorComps)) {
42        if (kRGBA_GrColorComponentFlags == colorComps) {
43            *color = tempColor;
44            return true;
45        }
46    }
47    return false;
48}
49
50bool GrPaint::getOpaqueAndKnownColor(GrColor* solidColor,
51                                     uint32_t* solidColorKnownComponents) const {
52
53    // TODO: Share this implementation with GrDrawState
54
55    GrProcessor::InvariantOutput inout;
56    inout.fColor = GrColorPackRGBA(fCoverage, fCoverage, fCoverage, fCoverage);
57    inout.fValidFlags = kRGBA_GrColorComponentFlags;
58    inout.fIsSingleComponent = true;
59    int count = fCoverageStages.count();
60    for (int i = 0; i < count; ++i) {
61        fCoverageStages[i].getProcessor()->computeInvariantOutput(&inout);
62    }
63    if (!inout.isSolidWhite()) {
64        return false;
65    }
66
67    inout.fColor = fColor;
68    inout.fValidFlags = kRGBA_GrColorComponentFlags;
69    inout.fIsSingleComponent = false;
70    count = fColorStages.count();
71    for (int i = 0; i < count; ++i) {
72        fColorStages[i].getProcessor()->computeInvariantOutput(&inout);
73    }
74
75    SkASSERT((NULL == solidColor) == (NULL == solidColorKnownComponents));
76
77    GrBlendCoeff srcCoeff = fSrcBlendCoeff;
78    GrBlendCoeff dstCoeff = fDstBlendCoeff;
79    GrSimplifyBlend(&srcCoeff, &dstCoeff, inout.fColor, inout.fValidFlags,
80                    0, 0, 0);
81
82    bool opaque = kZero_GrBlendCoeff == dstCoeff && !GrBlendCoeffRefsDst(srcCoeff);
83    if (solidColor) {
84        if (opaque) {
85            switch (srcCoeff) {
86                case kZero_GrBlendCoeff:
87                    *solidColor = 0;
88                    *solidColorKnownComponents = kRGBA_GrColorComponentFlags;
89                    break;
90
91                case kOne_GrBlendCoeff:
92                    *solidColor = inout.fColor;
93                    *solidColorKnownComponents = inout.fValidFlags;
94                    break;
95
96                // The src coeff should never refer to the src and if it refers to dst then opaque
97                // should have been false.
98                case kSC_GrBlendCoeff:
99                case kISC_GrBlendCoeff:
100                case kDC_GrBlendCoeff:
101                case kIDC_GrBlendCoeff:
102                case kSA_GrBlendCoeff:
103                case kISA_GrBlendCoeff:
104                case kDA_GrBlendCoeff:
105                case kIDA_GrBlendCoeff:
106                default:
107                    SkFAIL("srcCoeff should not refer to src or dst.");
108                    break;
109
110                // TODO: update this once GrPaint actually has a const color.
111                case kConstC_GrBlendCoeff:
112                case kIConstC_GrBlendCoeff:
113                case kConstA_GrBlendCoeff:
114                case kIConstA_GrBlendCoeff:
115                    *solidColorKnownComponents = 0;
116                    break;
117            }
118        } else {
119            solidColorKnownComponents = 0;
120        }
121    }
122    return opaque;
123}
124