1 /*
2 * Copyright 2012 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 "src/gpu/ganesh/GrSWMaskHelper.h"
9
10 #include "include/core/SkBitmap.h"
11 #include "include/gpu/GrRecordingContext.h"
12 #include "src/core/SkMatrixProvider.h"
13 #include "src/gpu/ganesh/GrCaps.h"
14 #include "src/gpu/ganesh/GrProxyProvider.h"
15 #include "src/gpu/ganesh/GrRecordingContextPriv.h"
16 #include "src/gpu/ganesh/GrTextureProxy.h"
17 #include "src/gpu/ganesh/SkGr.h"
18 #include "src/gpu/ganesh/SurfaceContext.h"
19 #include "src/gpu/ganesh/geometry/GrStyledShape.h"
20
21 /*
22 * Convert a boolean operation into a transfer mode code
23 */
op_to_mode(SkRegion::Op op)24 static SkBlendMode op_to_mode(SkRegion::Op op) {
25
26 static const SkBlendMode modeMap[] = {
27 SkBlendMode::kDstOut, // kDifference_Op
28 SkBlendMode::kModulate, // kIntersect_Op
29 SkBlendMode::kSrcOver, // kUnion_Op
30 SkBlendMode::kXor, // kXOR_Op
31 SkBlendMode::kClear, // kReverseDifference_Op
32 SkBlendMode::kSrc, // kReplace_Op
33 };
34
35 return modeMap[op];
36 }
37
get_paint(SkRegion::Op op,GrAA aa,uint8_t alpha)38 static SkPaint get_paint(SkRegion::Op op, GrAA aa, uint8_t alpha) {
39 SkPaint paint;
40 paint.setBlendMode(op_to_mode(op));
41 paint.setAntiAlias(GrAA::kYes == aa);
42 // SkPaint's color is unpremul so this will produce alpha in every channel.
43 paint.setColor(SkColorSetARGB(alpha, 255, 255, 255));
44 return paint;
45 }
46
47 /**
48 * Draw a single rect element of the clip stack into the accumulation bitmap
49 */
drawRect(const SkRect & rect,const SkMatrix & matrix,SkRegion::Op op,GrAA aa,uint8_t alpha)50 void GrSWMaskHelper::drawRect(const SkRect& rect, const SkMatrix& matrix, SkRegion::Op op, GrAA aa,
51 uint8_t alpha) {
52 SkMatrix translatedMatrix = matrix;
53 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
54 SkMatrixProvider matrixProvider(translatedMatrix);
55 fDraw.fMatrixProvider = &matrixProvider;
56
57 fDraw.drawRect(rect, get_paint(op, aa, alpha));
58 }
59
drawRRect(const SkRRect & rrect,const SkMatrix & matrix,SkRegion::Op op,GrAA aa,uint8_t alpha)60 void GrSWMaskHelper::drawRRect(const SkRRect& rrect, const SkMatrix& matrix, SkRegion::Op op,
61 GrAA aa, uint8_t alpha) {
62 SkMatrix translatedMatrix = matrix;
63 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
64 SkMatrixProvider matrixProvider(translatedMatrix);
65 fDraw.fMatrixProvider = &matrixProvider;
66
67 fDraw.drawRRect(rrect, get_paint(op, aa, alpha));
68 }
69
70 /**
71 * Draw a single path element of the clip stack into the accumulation bitmap
72 */
drawShape(const GrStyledShape & shape,const SkMatrix & matrix,SkRegion::Op op,GrAA aa,uint8_t alpha)73 void GrSWMaskHelper::drawShape(const GrStyledShape& shape, const SkMatrix& matrix, SkRegion::Op op,
74 GrAA aa, uint8_t alpha) {
75 SkPaint paint = get_paint(op, aa, alpha);
76 paint.setPathEffect(shape.style().refPathEffect());
77 shape.style().strokeRec().applyToPaint(&paint);
78
79 SkMatrix translatedMatrix = matrix;
80 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
81 SkMatrixProvider matrixProvider(translatedMatrix);
82 fDraw.fMatrixProvider = &matrixProvider;
83
84 SkPath path;
85 shape.asPath(&path);
86 if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
87 SkASSERT(0xFF == paint.getAlpha());
88 fDraw.drawPathCoverage(path, paint);
89 } else {
90 fDraw.drawPath(path, paint);
91 }
92 }
93
drawShape(const GrShape & shape,const SkMatrix & matrix,SkRegion::Op op,GrAA aa,uint8_t alpha)94 void GrSWMaskHelper::drawShape(const GrShape& shape, const SkMatrix& matrix, SkRegion::Op op,
95 GrAA aa, uint8_t alpha) {
96 SkPaint paint = get_paint(op, aa, alpha);
97
98 SkMatrix translatedMatrix = matrix;
99 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
100 SkMatrixProvider matrixProvider(translatedMatrix);
101 fDraw.fMatrixProvider = &matrixProvider;
102
103 if (shape.inverted()) {
104 if (shape.isEmpty() || shape.isLine() || shape.isPoint()) {
105 // These shapes are empty for simple fills, so when inverted, cover everything
106 fDraw.drawPaint(paint);
107 return;
108 }
109 // Else fall through to the draw method using asPath(), which will toggle fill type properly
110 } else if (shape.isEmpty() || shape.isLine() || shape.isPoint()) {
111 // Do nothing, these shapes do not cover any pixels for simple fills
112 return;
113 } else if (shape.isRect()) {
114 fDraw.drawRect(shape.rect(), paint);
115 return;
116 } else if (shape.isRRect()) {
117 fDraw.drawRRect(shape.rrect(), paint);
118 return;
119 }
120
121 // A complex, or inverse-filled shape, so go through drawPath.
122 SkPath path;
123 shape.asPath(&path);
124 if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
125 SkASSERT(0xFF == paint.getAlpha());
126 fDraw.drawPathCoverage(path, paint);
127 } else {
128 fDraw.drawPath(path, paint);
129 }
130 }
131
init(const SkIRect & resultBounds)132 bool GrSWMaskHelper::init(const SkIRect& resultBounds) {
133 // We will need to translate draws so the bound's UL corner is at the origin
134 fTranslate = {-SkIntToScalar(resultBounds.fLeft), -SkIntToScalar(resultBounds.fTop)};
135 SkIRect bounds = SkIRect::MakeWH(resultBounds.width(), resultBounds.height());
136
137 const SkImageInfo bmImageInfo = SkImageInfo::MakeA8(bounds.width(), bounds.height());
138 if (!fPixels->tryAlloc(bmImageInfo)) {
139 return false;
140 }
141 fPixels->erase(0);
142
143 fDraw.fDst = *fPixels;
144 fRasterClip.setRect(bounds);
145 fDraw.fRC = &fRasterClip;
146 return true;
147 }
148
toTextureView(GrRecordingContext * rContext,SkBackingFit fit)149 GrSurfaceProxyView GrSWMaskHelper::toTextureView(GrRecordingContext* rContext, SkBackingFit fit) {
150 SkImageInfo ii = SkImageInfo::MakeA8(fPixels->width(), fPixels->height());
151 size_t rowBytes = fPixels->rowBytes();
152
153 SkBitmap bitmap;
154 SkAssertResult(bitmap.installPixels(ii, fPixels->detachPixels(), rowBytes,
155 [](void* addr, void* context) { sk_free(addr); },
156 nullptr));
157 bitmap.setImmutable();
158
159 return std::get<0>(GrMakeUncachedBitmapProxyView(rContext, bitmap, GrMipmapped::kNo, fit));
160 }
161