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
|
/*
* 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 "GrCaps.h"
#include "GrContext.h"
#include "batches/GrDrawBatch.h"
#include "GrDrawContext.h"
#include "GrPipelineBuilder.h"
#include "GrShape.h"
#include "SkDistanceFieldGen.h"
#include "batches/GrRectBatchFactory.h"
/*
* Convert a boolean operation into a transfer mode code
*/
static 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::drawRect(const SkRect& rect, SkRegion::Op op,
bool antiAlias, uint8_t alpha) {
SkPaint paint;
paint.setXfermode(SkXfermode::Make(op_to_mode(op)));
paint.setAntiAlias(antiAlias);
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, bool antiAlias,
uint8_t alpha) {
SkPaint paint;
paint.setPathEffect(sk_ref_sp(shape.style().pathEffect()));
shape.style().strokeRec().applyToPaint(&paint);
paint.setAntiAlias(antiAlias);
SkPath path;
shape.asPath(&path);
if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
SkASSERT(0xFF == paint.getAlpha());
fDraw.drawPathCoverage(path, paint);
} else {
paint.setXfermodeMode(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;
}
/**
* Get a texture (from the texture cache) of the correct size & format.
*/
GrTexture* GrSWMaskHelper::createTexture() {
GrSurfaceDesc desc;
desc.fWidth = fPixels.width();
desc.fHeight = fPixels.height();
desc.fConfig = kAlpha_8_GrPixelConfig;
return fTexProvider->createApproxTexture(desc);
}
/**
* Move the result of the software mask generation back to the gpu
*/
void GrSWMaskHelper::toTexture(GrTexture *texture) {
// Since we're uploading to it, and it's compressed, 'texture' shouldn't
// have a render target.
SkASSERT(!texture->asRenderTarget());
texture->writePixels(0, 0, fPixels.width(), fPixels.height(), texture->config(),
fPixels.addr(), fPixels.rowBytes());
}
/**
* 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.
*/
GrTexture* GrSWMaskHelper::DrawShapeMaskToTexture(GrTextureProvider* texProvider,
const GrShape& shape,
const SkIRect& resultBounds,
bool antiAlias,
const SkMatrix* matrix) {
GrSWMaskHelper helper(texProvider);
if (!helper.init(resultBounds, matrix)) {
return nullptr;
}
helper.drawShape(shape, SkRegion::kReplace_Op, antiAlias, 0xFF);
GrTexture* texture(helper.createTexture());
if (!texture) {
return nullptr;
}
helper.toTexture(texture);
return texture;
}
void GrSWMaskHelper::DrawToTargetWithShapeMask(GrTexture* texture,
GrDrawContext* drawContext,
const GrPaint& paint,
const GrUserStencilSettings& userStencilSettings,
const GrClip& clip,
const SkMatrix& viewMatrix,
const SkIRect& rect) {
SkMatrix invert;
if (!viewMatrix.invert(&invert)) {
return;
}
SkRect dstRect = SkRect::MakeLTRB(SK_Scalar1 * rect.fLeft,
SK_Scalar1 * rect.fTop,
SK_Scalar1 * rect.fRight,
SK_Scalar1 * rect.fBottom);
// We use device coords to compute the texture coordinates. We take the device coords and apply
// a translation so that the top-left of the device bounds maps to 0,0, and then a scaling
// matrix to normalized coords.
SkMatrix maskMatrix;
maskMatrix.setIDiv(texture->width(), texture->height());
maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));
GrPipelineBuilder pipelineBuilder(paint, drawContext->mustUseHWAA(paint));
pipelineBuilder.setUserStencil(&userStencilSettings);
pipelineBuilder.addCoverageFragmentProcessor(
GrSimpleTextureEffect::Make(texture,
nullptr,
maskMatrix,
GrTextureParams::kNone_FilterMode,
kDevice_GrCoordSet));
SkAutoTUnref<GrDrawBatch> batch(GrRectBatchFactory::CreateNonAAFill(paint.getColor(),
SkMatrix::I(),
dstRect, nullptr, &invert));
drawContext->drawBatch(pipelineBuilder, clip, batch);
}
|
