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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* 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 "GrDrawState.h"
#include "GrGpu.h"
#include "SkStrokeRec.h"
// TODO: try to remove this #include
#include "GrContext.h"
namespace {
/*
* Convert a boolean operation into a transfer mode code
*/
SkXfermode::Mode op_to_mode(SkRegion::Op op) {
static const SkXfermode::Mode modeMap[] = {
SkXfermode::kDstOut_Mode, // kDifference_Op
SkXfermode::kModulate_Mode, // kIntersect_Op
SkXfermode::kSrcOver_Mode, // kUnion_Op
SkXfermode::kXor_Mode, // kXOR_Op
SkXfermode::kClear_Mode, // kReverseDifference_Op
SkXfermode::kSrc_Mode, // kReplace_Op
};
return modeMap[op];
}
}
/**
* Draw a single rect element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::draw(const GrRect& rect, SkRegion::Op op,
bool antiAlias, uint8_t alpha) {
SkPaint paint;
SkXfermode* mode = SkXfermode::Create(op_to_mode(op));
paint.setXfermode(mode);
paint.setAntiAlias(antiAlias);
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawRect(rect, paint);
SkSafeUnref(mode);
}
/**
* Draw a single path element of the clip stack into the accumulation bitmap
*/
void GrSWMaskHelper::draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op,
bool antiAlias, uint8_t alpha) {
SkPaint paint;
if (stroke.isHairlineStyle()) {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SK_Scalar1);
} else {
if (stroke.isFillStyle()) {
paint.setStyle(SkPaint::kFill_Style);
} else {
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeJoin(stroke.getJoin());
paint.setStrokeCap(stroke.getCap());
paint.setStrokeWidth(stroke.getWidth());
}
}
SkXfermode* mode = SkXfermode::Create(op_to_mode(op));
paint.setXfermode(mode);
paint.setAntiAlias(antiAlias);
paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
fDraw.drawPath(path, paint);
SkSafeUnref(mode);
}
bool GrSWMaskHelper::init(const GrIRect& resultBounds,
const SkMatrix* matrix) {
if (NULL != matrix) {
fMatrix = *matrix;
} else {
fMatrix.setIdentity();
}
// Now translate so the bound's UL corner is at the origin
fMatrix.postTranslate(-resultBounds.fLeft * SK_Scalar1,
-resultBounds.fTop * SK_Scalar1);
GrIRect bounds = GrIRect::MakeWH(resultBounds.width(),
resultBounds.height());
fBM.setConfig(SkBitmap::kA8_Config, bounds.fRight, bounds.fBottom);
if (!fBM.allocPixels()) {
return false;
}
sk_bzero(fBM.getPixels(), fBM.getSafeSize());
sk_bzero(&fDraw, sizeof(fDraw));
fRasterClip.setRect(bounds);
fDraw.fRC = &fRasterClip;
fDraw.fClip = &fRasterClip.bwRgn();
fDraw.fMatrix = &fMatrix;
fDraw.fBitmap = &fBM;
return true;
}
/**
* Get a texture (from the texture cache) of the correct size & format.
* Return true on success; false on failure.
*/
bool GrSWMaskHelper::getTexture(GrAutoScratchTexture* texture) {
GrTextureDesc desc;
desc.fWidth = fBM.width();
desc.fHeight = fBM.height();
desc.fConfig = kAlpha_8_GrPixelConfig;
texture->set(fContext, desc);
return NULL != texture->texture();
}
/**
* Move the result of the software mask generation back to the gpu
*/
void GrSWMaskHelper::toTexture(GrTexture *texture, uint8_t alpha) {
SkAutoLockPixels alp(fBM);
// The destination texture is almost always larger than "fBM". Clear
// it appropriately so we don't get mask artifacts outside of the path's
// bounding box
// "texture" needs to be installed as the render target for the clear
// and the texture upload but cannot remain the render target upon
// return. Callers typically use it as a texture and it would then
// be both source and dest.
GrDrawState::AutoRenderTargetRestore artr(fContext->getGpu()->drawState(),
texture->asRenderTarget());
fContext->getGpu()->clear(NULL, GrColorPackRGBA(alpha, alpha, alpha, alpha));
texture->writePixels(0, 0, fBM.width(), fBM.height(),
kAlpha_8_GrPixelConfig,
fBM.getPixels(), fBM.rowBytes());
}
////////////////////////////////////////////////////////////////////////////////
/**
* Software rasterizes path to A8 mask (possibly using the context's matrix)
* and uploads the result to a scratch texture. Returns the resulting
* texture on success; NULL on failure.
*/
GrTexture* GrSWMaskHelper::DrawPathMaskToTexture(GrContext* context,
const SkPath& path,
const SkStrokeRec& stroke,
const GrIRect& resultBounds,
bool antiAlias,
SkMatrix* matrix) {
GrAutoScratchTexture ast;
GrSWMaskHelper helper(context);
if (!helper.init(resultBounds, matrix)) {
return NULL;
}
helper.draw(path, stroke, SkRegion::kReplace_Op, antiAlias, 0xFF);
if (!helper.getTexture(&ast)) {
return NULL;
}
helper.toTexture(ast.texture(), 0x00);
return ast.detach();
}
void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
GrDrawTarget* target,
const GrIRect& rect) {
GrDrawState* drawState = target->drawState();
GrDrawState::AutoDeviceCoordDraw adcd(drawState);
if (!adcd.succeeded()) {
return;
}
enum {
// the SW path renderer shares this stage with glyph
// rendering (kGlyphMaskStage in GrBatchedTextContext)
kPathMaskStage = GrPaint::kTotalStages,
};
GrAssert(!drawState->isStageEnabled(kPathMaskStage));
drawState->createTextureEffect(kPathMaskStage, texture, SkMatrix::I());
SkScalar w = SkIntToScalar(rect.width());
SkScalar h = SkIntToScalar(rect.height());
GrRect maskRect = GrRect::MakeWH(w / texture->width(),
h / texture->height());
GrRect dstRect = GrRect::MakeLTRB(
SK_Scalar1 * rect.fLeft,
SK_Scalar1 * rect.fTop,
SK_Scalar1 * rect.fRight,
SK_Scalar1 * rect.fBottom);
target->drawRect(dstRect, NULL, &maskRect, NULL, kPathMaskStage);
drawState->disableStage(kPathMaskStage);
}
|
