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
|
/*
* 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 "GrGpu.h"
#include "GrPath.h"
#include "SkStrokeRec.h"
GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrContext* context) {
GrAssert(NULL != context);
GrAssert(NULL != context->getGpu());
if (context->getGpu()->getCaps().pathStencilingSupport()) {
return SkNEW_ARGS(GrStencilAndCoverPathRenderer, (context->getGpu()));
} else {
return NULL;
}
}
GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrGpu* gpu) {
GrAssert(gpu->getCaps().pathStencilingSupport());
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.isFillStyle() &&
!antiAlias && // doesn't do per-path AA, relies on the target having MSAA
target->getDrawState().getStencil().isDisabled();
}
GrPathRenderer::StencilSupport GrStencilAndCoverPathRenderer::onGetStencilSupport(
const SkPath&,
const SkStrokeRec& ,
const GrDrawTarget*) const {
return GrPathRenderer::kStencilOnly_StencilSupport;
}
void GrStencilAndCoverPathRenderer::onStencilPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target) {
GrAssert(!path.isInverseFillType());
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
target->stencilPath(p, stroke, path.getFillType());
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
GrAssert(!antiAlias);
GrAssert(!stroke.isHairlineStyle());
GrDrawState* drawState = target->drawState();
GrAssert(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
SkPath::FillType nonInvertedFill = SkPath::ConvertToNonInverseFillType(path.getFillType());
target->stencilPath(p, stroke, nonInvertedFill);
// TODO: Use built in cover operation rather than a rect draw. This will require making our
// fragment shaders be able to eat varyings generated by a matrix.
// fill the path, zero out the stencil
GrRect bounds = p->getBounds();
SkScalar bloat = drawState->getViewMatrix().getMaxStretch() * SK_ScalarHalf;
GrDrawState::AutoDeviceCoordDraw adcd;
if (nonInvertedFill == path.getFillType()) {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
*drawState->stencil() = kStencilPass;
} else {
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);
SkMatrix vmi;
bounds.setLTRB(0, 0,
SkIntToScalar(drawState->getRenderTarget()->width()),
SkIntToScalar(drawState->getRenderTarget()->height()));
// 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.
} else {
adcd.set(drawState);
bloat = 0;
}
*drawState->stencil() = kInvertedStencilPass;
}
bounds.outset(bloat, bloat);
target->drawSimpleRect(bounds, NULL);
target->drawState()->stencil()->setDisabled();
return true;
}
|
