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/core/SkColor.h"
12 #include "include/gpu/GrRecordingContext.h"
13 #include "src/core/SkBlitter_A8.h"
14 #include "src/gpu/ganesh/GrCaps.h"
15 #include "src/gpu/ganesh/GrProxyProvider.h"
16 #include "src/gpu/ganesh/GrRecordingContextPriv.h"
17 #include "src/gpu/ganesh/GrTextureProxy.h"
18 #include "src/gpu/ganesh/SkGr.h"
19 #include "src/gpu/ganesh/SurfaceContext.h"
20 #include "src/gpu/ganesh/geometry/GrStyledShape.h"
21
get_paint(GrAA aa,uint8_t alpha)22 static SkPaint get_paint(GrAA aa, uint8_t alpha) {
23 SkPaint paint;
24 paint.setBlendMode(SkBlendMode::kSrc); // "Replace" mode
25 paint.setAntiAlias(GrAA::kYes == aa);
26 // SkPaint's color is unpremul so this will produce alpha in every channel.
27 paint.setColor(SkColorSetARGB(alpha, 255, 255, 255));
28 return paint;
29 }
30
31 /**
32 * Draw a single rect element of the clip stack into the accumulation bitmap
33 */
drawRect(const SkRect & rect,const SkMatrix & matrix,GrAA aa,uint8_t alpha)34 void GrSWMaskHelper::drawRect(const SkRect& rect, const SkMatrix& matrix, GrAA aa, uint8_t alpha) {
35 SkMatrix translatedMatrix = matrix;
36 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
37 fDraw.fCTM = &translatedMatrix;
38
39 fDraw.drawRect(rect, get_paint(aa, alpha));
40 }
41
drawRRect(const SkRRect & rrect,const SkMatrix & matrix,GrAA aa,uint8_t alpha)42 void GrSWMaskHelper::drawRRect(const SkRRect& rrect, const SkMatrix& matrix,
43 GrAA aa, uint8_t alpha) {
44 SkMatrix translatedMatrix = matrix;
45 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
46 fDraw.fCTM = &translatedMatrix;
47
48 fDraw.drawRRect(rrect, get_paint(aa, alpha));
49 }
50
51 /**
52 * Draw a single path element of the clip stack into the accumulation bitmap
53 */
drawShape(const GrStyledShape & shape,const SkMatrix & matrix,GrAA aa,uint8_t alpha)54 void GrSWMaskHelper::drawShape(const GrStyledShape& shape, const SkMatrix& matrix,
55 GrAA aa, uint8_t alpha) {
56 SkPaint paint = get_paint(aa, alpha);
57 paint.setPathEffect(shape.style().refPathEffect());
58 shape.style().strokeRec().applyToPaint(&paint);
59
60 SkMatrix translatedMatrix = matrix;
61 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
62 fDraw.fCTM = &translatedMatrix;
63
64 SkPath path;
65 shape.asPath(&path);
66 if (0xFF == alpha) {
67 SkASSERT(0xFF == paint.getAlpha());
68 fDraw.drawPathCoverage(path, paint);
69 } else {
70 fDraw.drawPath(path, paint);
71 }
72 }
73
drawShape(const GrShape & shape,const SkMatrix & matrix,GrAA aa,uint8_t alpha)74 void GrSWMaskHelper::drawShape(const GrShape& shape, const SkMatrix& matrix,
75 GrAA aa, uint8_t alpha) {
76 SkPaint paint = get_paint(aa, alpha);
77
78 SkMatrix translatedMatrix = matrix;
79 translatedMatrix.postTranslate(fTranslate.fX, fTranslate.fY);
80 fDraw.fCTM = &translatedMatrix;
81
82 if (shape.inverted()) {
83 if (shape.isEmpty() || shape.isLine() || shape.isPoint()) {
84 // These shapes are empty for simple fills, so when inverted, cover everything
85 fDraw.drawPaint(paint);
86 return;
87 }
88 // Else fall through to the draw method using asPath(), which will toggle fill type properly
89 } else if (shape.isEmpty() || shape.isLine() || shape.isPoint()) {
90 // Do nothing, these shapes do not cover any pixels for simple fills
91 return;
92 } else if (shape.isRect()) {
93 fDraw.drawRect(shape.rect(), paint);
94 return;
95 } else if (shape.isRRect()) {
96 fDraw.drawRRect(shape.rrect(), paint);
97 return;
98 }
99
100 // A complex, or inverse-filled shape, so go through drawPath.
101 SkPath path;
102 shape.asPath(&path);
103 if (0xFF == alpha) {
104 SkASSERT(0xFF == paint.getAlpha());
105 fDraw.drawPathCoverage(path, paint);
106 } else {
107 fDraw.drawPath(path, paint);
108 }
109 }
110
init(const SkIRect & resultBounds)111 bool GrSWMaskHelper::init(const SkIRect& resultBounds) {
112 // We will need to translate draws so the bound's UL corner is at the origin
113 fTranslate = {-SkIntToScalar(resultBounds.fLeft), -SkIntToScalar(resultBounds.fTop)};
114 SkIRect bounds = SkIRect::MakeWH(resultBounds.width(), resultBounds.height());
115
116 const SkImageInfo bmImageInfo = SkImageInfo::MakeA8(bounds.width(), bounds.height());
117 if (!fPixels->tryAlloc(bmImageInfo)) {
118 return false;
119 }
120 fPixels->erase(0);
121
122 fDraw.fBlitterChooser = SkA8Blitter_Choose;
123 fDraw.fDst = *fPixels;
124 fRasterClip.setRect(bounds);
125 fDraw.fRC = &fRasterClip;
126 return true;
127 }
128
toTextureView(GrRecordingContext * rContext,SkBackingFit fit)129 GrSurfaceProxyView GrSWMaskHelper::toTextureView(GrRecordingContext* rContext, SkBackingFit fit) {
130 SkImageInfo ii = SkImageInfo::MakeA8(fPixels->width(), fPixels->height());
131 size_t rowBytes = fPixels->rowBytes();
132
133 SkBitmap bitmap;
134 SkAssertResult(bitmap.installPixels(ii, fPixels->detachPixels(), rowBytes,
135 [](void* addr, void* context) { sk_free(addr); },
136 nullptr));
137 bitmap.setImmutable();
138
139 return std::get<0>(GrMakeUncachedBitmapProxyView(rContext, bitmap, skgpu::Mipmapped::kNo, fit));
140 }
141