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Side by Side Diff: src/core/SkPaintPriv.cpp

Issue 663233002: More genericity: overload isPaintOpaque(SkPaint, SkBitmap) (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Rename enum Created 6 years, 2 months ago
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1 /* 1 /*
2 * Copyright 2013 Google Inc. 2 * Copyright 2013 Google Inc.
3 * 3 *
4 * Use of this source code is governed by a BSD-style license that can be 4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file. 5 * found in the LICENSE file.
6 */ 6 */
7 7
8 #include "SkPaintPriv.h" 8 #include "SkPaintPriv.h"
9 9
10 #include "SkBitmap.h" 10 #include "SkBitmap.h"
11 #include "SkColorFilter.h" 11 #include "SkColorFilter.h"
12 #include "SkPaint.h" 12 #include "SkPaint.h"
13 #include "SkShader.h" 13 #include "SkShader.h"
14 14
15 bool isPaintOpaque(const SkPaint* paint, 15 bool isPaintOpaque(const SkPaint* paint, SkPaintBitmapOpacity contentType) {
16 const SkBitmap* bmpReplacesShader) {
17 // TODO: SkXfermode should have a virtual isOpaque method, which would 16 // TODO: SkXfermode should have a virtual isOpaque method, which would
18 // make it possible to test modes that do not have a Coeff representation. 17 // make it possible to test modes that do not have a Coeff representation.
19 18
20 if (!paint) { 19 if (!paint) {
21 return bmpReplacesShader ? bmpReplacesShader->isOpaque() : true; 20 return contentType != kUnknown_SkPaintBitmapOpacity;
22 } 21 }
23 22
24 SkXfermode::Coeff srcCoeff, dstCoeff; 23 SkXfermode::Coeff srcCoeff, dstCoeff;
25 if (SkXfermode::AsCoeff(paint->getXfermode(), &srcCoeff, &dstCoeff)){ 24 if (SkXfermode::AsCoeff(paint->getXfermode(), &srcCoeff, &dstCoeff)){
26 if (SkXfermode::kDA_Coeff == srcCoeff || SkXfermode::kDC_Coeff == srcCoe ff || 25 if (SkXfermode::kDA_Coeff == srcCoeff || SkXfermode::kDC_Coeff == srcCoe ff ||
27 SkXfermode::kIDA_Coeff == srcCoeff || SkXfermode::kIDC_Coeff == srcC oeff) { 26 SkXfermode::kIDA_Coeff == srcCoeff || SkXfermode::kIDC_Coeff == srcC oeff) {
28 return false; 27 return false;
29 } 28 }
30 switch (dstCoeff) { 29 switch (dstCoeff) {
31 case SkXfermode::kZero_Coeff: 30 case SkXfermode::kZero_Coeff:
32 return true; 31 return true;
33 case SkXfermode::kISA_Coeff: 32 case SkXfermode::kISA_Coeff:
34 if (paint->getAlpha() != 255) { 33 if (paint->getAlpha() != 255) {
35 break; 34 break;
36 } 35 }
37 if (bmpReplacesShader) { 36 if (contentType == kUnknown_SkPaintBitmapOpacity) {
38 if (!bmpReplacesShader->isOpaque()) { 37 break;
39 break;
40 }
41 } else if (paint->getShader() && !paint->getShader()->isOpaque()) { 38 } else if (paint->getShader() && !paint->getShader()->isOpaque()) {
42 break; 39 break;
43 } 40 }
44 if (paint->getColorFilter() && 41 if (paint->getColorFilter() &&
45 ((paint->getColorFilter()->getFlags() & 42 ((paint->getColorFilter()->getFlags() &
46 SkColorFilter::kAlphaUnchanged_Flag) == 0)) { 43 SkColorFilter::kAlphaUnchanged_Flag) == 0)) {
47 break; 44 break;
48 } 45 }
49 return true; 46 return true;
50 case SkXfermode::kSA_Coeff: 47 case SkXfermode::kSA_Coeff:
51 if (paint->getAlpha() != 0) { 48 if (paint->getAlpha() != 0) {
52 break; 49 break;
53 } 50 }
54 if (paint->getColorFilter() && 51 if (paint->getColorFilter() &&
55 ((paint->getColorFilter()->getFlags() & 52 ((paint->getColorFilter()->getFlags() &
56 SkColorFilter::kAlphaUnchanged_Flag) == 0)) { 53 SkColorFilter::kAlphaUnchanged_Flag) == 0)) {
57 break; 54 break;
58 } 55 }
59 return true; 56 return true;
60 case SkXfermode::kSC_Coeff: 57 case SkXfermode::kSC_Coeff:
61 if (paint->getColor() != 0) { // all components must be 0 58 if (paint->getColor() != 0) { // all components must be 0
62 break; 59 break;
63 } 60 }
64 if (bmpReplacesShader || paint->getShader()) { 61 if (contentType != kNoBitmap_SkPaintBitmapOpacity || paint->getShade r()) {
65 break; 62 break;
66 } 63 }
67 if (paint->getColorFilter() && ( 64 if (paint->getColorFilter() && (
68 (paint->getColorFilter()->getFlags() & 65 (paint->getColorFilter()->getFlags() &
69 SkColorFilter::kAlphaUnchanged_Flag) == 0)) { 66 SkColorFilter::kAlphaUnchanged_Flag) == 0)) {
70 break; 67 break;
71 } 68 }
72 return true; 69 return true;
73 default: 70 default:
74 break; 71 break;
75 } 72 }
76 } 73 }
77 return false; 74 return false;
78 } 75 }
76
77 bool isPaintOpaque(const SkPaint* paint, const SkBitmap* bmpReplacesShader) {
78 SkPaintBitmapOpacity contentType;
79
80 if(!bmpReplacesShader)
81 contentType = kNoBitmap_SkPaintBitmapOpacity;
82 else if(bmpReplacesShader->isOpaque())
83 contentType = kOpaque_SkPaintBitmapOpacity;
84 else
85 contentType = kUnknown_SkPaintBitmapOpacity;
86
87 return isPaintOpaque(paint, contentType);
88 }
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