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
144
145
146
147
148
149
|
/*
* 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 "GrStencilAndCoverPathRenderer.h"
#include "GrContext.h"
#include "GrDrawTargetCaps.h"
#include "GrGpu.h"
#include "GrPath.h"
#include "SkStrokeRec.h"
/*
* For now paths only natively support winding and even odd fill types
*/
static GrPathRendering::FillType convert_skpath_filltype(SkPath::FillType fill) {
switch (fill) {
default:
SkFAIL("Incomplete Switch\n");
case SkPath::kWinding_FillType:
case SkPath::kInverseWinding_FillType:
return GrPathRendering::kWinding_FillType;
case SkPath::kEvenOdd_FillType:
case SkPath::kInverseEvenOdd_FillType:
return GrPathRendering::kEvenOdd_FillType;
}
}
GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrContext* context) {
SkASSERT(context);
SkASSERT(context->getGpu());
if (context->getGpu()->caps()->pathRenderingSupport()) {
return SkNEW_ARGS(GrStencilAndCoverPathRenderer, (context->getGpu()));
} else {
return NULL;
}
}
GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrGpu* gpu) {
SkASSERT(gpu->caps()->pathRenderingSupport());
fGpu = gpu;
gpu->ref();
}
GrStencilAndCoverPathRenderer::~GrStencilAndCoverPathRenderer() {
fGpu->unref();
}
bool GrStencilAndCoverPathRenderer::canDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
const GrDrawTarget* target,
bool antiAlias) const {
return !stroke.isHairlineStyle() &&
!antiAlias && // doesn't do per-path AA, relies on the target having MSAA
target->getDrawState().getRenderTarget()->getStencilBuffer() &&
target->getDrawState().getStencil().isDisabled();
}
GrPathRenderer::StencilSupport
GrStencilAndCoverPathRenderer::onGetStencilSupport(const SkPath&,
const SkStrokeRec& ,
const GrDrawTarget*) const {
return GrPathRenderer::kStencilOnly_StencilSupport;
}
static GrPath* get_gr_path(GrGpu* gpu, const SkPath& skPath, const SkStrokeRec& stroke) {
GrContext* ctx = gpu->getContext();
GrResourceKey resourceKey = GrPath::ComputeKey(skPath, stroke);
SkAutoTUnref<GrPath> path(static_cast<GrPath*>(ctx->findAndRefCachedResource(resourceKey)));
if (NULL == path || !path->isEqualTo(skPath, stroke)) {
path.reset(gpu->pathRendering()->createPath(skPath, stroke));
ctx->addResourceToCache(resourceKey, path);
}
return path.detach();
}
void GrStencilAndCoverPathRenderer::onStencilPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target) {
SkASSERT(!path.isInverseFillType());
SkAutoTUnref<GrPath> p(get_gr_path(fGpu, path, stroke));
target->stencilPath(p, convert_skpath_filltype(path.getFillType()));
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
SkASSERT(!antiAlias);
SkASSERT(!stroke.isHairlineStyle());
GrDrawState* drawState = target->drawState();
SkASSERT(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(get_gr_path(fGpu, path, stroke));
if (path.isInverseFillType()) {
GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
kZero_StencilOp,
kZero_StencilOp,
// We know our rect will hit pixels outside the clip and the user bits will be 0
// outside the clip. So we can't just fill where the user bits are 0. We also need to
// check that the clip bit is set.
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
drawState->setStencil(kInvertedStencilPass);
// fake inverse with a stencil and cover
target->stencilPath(p, convert_skpath_filltype(path.getFillType()));
GrDrawState::AutoViewMatrixRestore avmr;
SkRect bounds = SkRect::MakeLTRB(0, 0,
SkIntToScalar(drawState->getRenderTarget()->width()),
SkIntToScalar(drawState->getRenderTarget()->height()));
SkMatrix vmi;
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
SkScalar bloat = drawState->getViewMatrix().getMaxScale() * SK_ScalarHalf;
bounds.outset(bloat, bloat);
} else {
avmr.setIdentity(drawState);
}
target->drawSimpleRect(bounds);
} else {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
drawState->setStencil(kStencilPass);
target->drawPath(p, convert_skpath_filltype(path.getFillType()));
}
target->drawState()->stencil()->setDisabled();
return true;
}
|
