GrPaint.cpp revision 66017f6cc52770c04078dc74ddcda27349002652 
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::addColorTextureEffect(GrTexture* texture, const SkMatrix& matrix) {
15    GrEffectRef* effect = GrSimpleTextureEffect::Create(texture, matrix);
16    this->addColorEffect(effect)->unref();
17}
18
19void GrPaint::addCoverageTextureEffect(GrTexture* texture, const SkMatrix& matrix) {
20    GrEffectRef* effect = GrSimpleTextureEffect::Create(texture, matrix);
21    this->addCoverageEffect(effect)->unref();
22}
23
24void GrPaint::addColorTextureEffect(GrTexture* texture,
25                                    const SkMatrix& matrix,
26                                    const GrTextureParams& params) {
27    GrEffectRef* effect = GrSimpleTextureEffect::Create(texture, matrix, params);
28    this->addColorEffect(effect)->unref();
29}
30
31void GrPaint::addCoverageTextureEffect(GrTexture* texture,
32                                       const SkMatrix& matrix,
33                                       const GrTextureParams& params) {
34    GrEffectRef* effect = GrSimpleTextureEffect::Create(texture, matrix, params);
35    this->addCoverageEffect(effect)->unref();
36}
37
38bool GrPaint::isOpaque() const {
39    return this->getOpaqueAndKnownColor(NULL, NULL);
40}
41
42bool GrPaint::isOpaqueAndConstantColor(GrColor* color) const {
43    GrColor tempColor;
44    uint32_t colorComps;
45    if (this->getOpaqueAndKnownColor(&tempColor, &colorComps)) {
46        if (kRGBA_GrColorComponentFlags == colorComps) {
47            *color = tempColor;
48            return true;
49        }
50    }
51    return false;
52}
53
54bool GrPaint::getOpaqueAndKnownColor(GrColor* solidColor,
55                                     uint32_t* solidColorKnownComponents) const {
56
57    // TODO: Share this implementation with GrDrawState
58
59    // Since fColorFilterXfermode is going away soon, we aren't attempting to handle anything but
60    // the default setting.
61    if (SkXfermode::kDst_Mode != fColorFilterXfermode) {
62        return false;
63    }
64
65    GrColor coverage = GrColorPackRGBA(fCoverage, fCoverage, fCoverage, fCoverage);
66    uint32_t coverageComps = kRGBA_GrColorComponentFlags;
67    int count = fCoverageStages.count();
68    for (int i = 0; i < count; ++i) {
69        (*fCoverageStages[i].getEffect())->getConstantColorComponents(&coverage, &coverageComps);
70    }
71    if (kRGBA_GrColorComponentFlags != coverageComps || 0xffffffff != coverage) {
72        return false;
73    }
74
75    GrColor color = fColor;
76    uint32_t colorComps = kRGBA_GrColorComponentFlags;
77    count = fColorStages.count();
78    for (int i = 0; i < count; ++i) {
79        (*fColorStages[i].getEffect())->getConstantColorComponents(&color, &colorComps);
80    }
81
82    GrAssert((NULL == solidColor) == (NULL == solidColorKnownComponents));
83    if (NULL != solidColor) {
84        *solidColor = color;
85        *solidColorKnownComponents = colorComps;
86    }
87
88    GrBlendCoeff srcCoeff = fSrcBlendCoeff;
89    GrBlendCoeff dstCoeff = fDstBlendCoeff;
90    GrSimplifyBlend(&srcCoeff, &dstCoeff, color, colorComps, 0, 0, 0);
91    return kZero_GrBlendCoeff == dstCoeff && !GrBlendCoeffRefsDst(srcCoeff);
92}
93