1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrSWMaskHelper.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrShape.h"
#include "GrSurfaceContext.h"
#include "GrTextureProxy.h"
#include "SkDistanceFieldGen.h"
/*
* Convert a boolean operation into a transfer mode code
*/
static SkBlendMode op_to_mode(SkRegion::Op op) {
static const SkBlendMode modeMap[] = {
SkBlendMode::kDstOut, // kDifference_Op
SkBlendMode::kModulate, // kIntersect_Op
SkBlendMode::kSrcOver, // kUnion_Op
SkBlendMode::kXor, // kXOR_Op
SkBlendMode::kClear, // kReverseDifference_Op
SkBlendMode::kSrc, // kReplace_Op
};
return modeMap[op];
}
/**
* Draw a single rect element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::drawRect(const SkRect& rect, SkRegion::Op op, GrAA aa, uint8_t alpha) {
SkPaint paint;
paint.setBlendMode(op_to_mode(op));
paint.setAntiAlias(GrAA::kYes == aa);
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawRect(rect, paint);
}
/**
* Draw a single path element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::drawShape(const GrShape& shape, SkRegion::Op op, GrAA aa, uint8_t alpha) {
SkPaint paint;
paint.setPathEffect(shape.style().refPathEffect());
shape.style().strokeRec().applyToPaint(&paint);
paint.setAntiAlias(GrAA::kYes == aa);
SkPath path;
shape.asPath(&path);
if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
SkASSERT(0xFF == paint.getAlpha());
fDraw.drawPathCoverage(path, paint);
} else {
paint.setBlendMode(op_to_mode(op));
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawPath(path, paint);
}
}
bool GrSWMaskHelper::init(const SkIRect& resultBounds, const SkMatrix* matrix) {
if (matrix) {
fMatrix = *matrix;
} else {
fMatrix.setIdentity();
}
// Now translate so the bound's UL corner is at the origin
fMatrix.postTranslate(-SkIntToScalar(resultBounds.fLeft), -SkIntToScalar(resultBounds.fTop));
SkIRect bounds = SkIRect::MakeWH(resultBounds.width(), resultBounds.height());
const SkImageInfo bmImageInfo = SkImageInfo::MakeA8(bounds.width(), bounds.height());
if (!fPixels.tryAlloc(bmImageInfo)) {
return false;
}
fPixels.erase(0);
sk_bzero(&fDraw, sizeof(fDraw));
fDraw.fDst = fPixels;
fRasterClip.setRect(bounds);
fDraw.fRC = &fRasterClip;
fDraw.fMatrix = &fMatrix;
return true;
}
sk_sp<GrTextureProxy> GrSWMaskHelper::toTextureProxy(GrContext* context, SkBackingFit fit) {
GrSurfaceDesc desc;
desc.fOrigin = kTopLeft_GrSurfaceOrigin;
desc.fWidth = fPixels.width();
desc.fHeight = fPixels.height();
desc.fConfig = kAlpha_8_GrPixelConfig;
sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeDeferredSurfaceContext(
desc,
fit,
SkBudgeted::kYes);
if (!sContext || !sContext->asTextureProxy()) {
return nullptr;
}
SkImageInfo ii = SkImageInfo::MakeA8(desc.fWidth, desc.fHeight);
if (!sContext->writePixels(ii, fPixels.addr(), fPixels.rowBytes(), 0, 0)) {
return nullptr;
}
return sContext->asTextureProxyRef();
}
/**
* Convert mask generation results to a signed distance field
*/
void GrSWMaskHelper::toSDF(unsigned char* sdf) {
SkGenerateDistanceFieldFromA8Image(sdf, (const unsigned char*)fPixels.addr(),
fPixels.width(), fPixels.height(), fPixels.rowBytes());
}
////////////////////////////////////////////////////////////////////////////////
/**
* Software rasterizes shape to A8 mask and uploads the result to a scratch texture. Returns the
* resulting texture on success; nullptr on failure.
*/
sk_sp<GrTextureProxy> GrSWMaskHelper::DrawShapeMaskToTexture(GrContext* context,
const GrShape& shape,
const SkIRect& resultBounds,
GrAA aa,
SkBackingFit fit,
const SkMatrix* matrix) {
GrSWMaskHelper helper;
if (!helper.init(resultBounds, matrix)) {
return nullptr;
}
helper.drawShape(shape, SkRegion::kReplace_Op, aa, 0xFF);
return helper.toTextureProxy(context, fit);
}
|
