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
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkRect.h"
namespace skiagm {
/*
* This GM exercises the flags to SkCanvas::save(). The canvas' save() and
* restore actions can be limited to only a portion of the canvas' state through
* the use of flags when calling save.
*/
class CanvasStateGM : public GM {
SkSize fSize;
enum {
WIDTH = 150,
HEIGHT = 150,
};
SkPaint fFillPaint;
SkPaint fStrokePaint;
SkPath fPath;
SkRect fOutlineRect;
SkRect fFillRect;
public:
CanvasStateGM() {
fSize.set(SkIntToScalar(WIDTH), SkIntToScalar(HEIGHT));
fFillPaint.setColor(SK_ColorRED);
fFillPaint.setStyle(SkPaint::kFill_Style);
fStrokePaint.setColor(SK_ColorBLUE);
fStrokePaint.setStyle(SkPaint::kStroke_Style);
fStrokePaint.setStrokeWidth(1);
fPath.moveTo(25, 25);
fPath.lineTo(125, 25);
fPath.lineTo(75, 125);
fPath.close();
fOutlineRect = SkRect::MakeXYWH(1, 1, WIDTH-2, HEIGHT-2);
fFillRect = SkRect::MakeXYWH(10, 10, WIDTH-20, HEIGHT-20);
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("canvas-state");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(WIDTH*3, HEIGHT*4);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkCanvas::SaveFlags flags[] = { SkCanvas::kMatrix_SaveFlag,
SkCanvas::kClip_SaveFlag,
SkCanvas::kMatrixClip_SaveFlag };
// columns -- flags
// rows -- permutations of setting the clip and matrix
for (size_t i = 0; i < SK_ARRAY_COUNT(flags); ++i) {
for (int j = 0; j < 2; ++j) {
for (int k = 0; k < 2; ++k) {
this->drawTestPattern(i, (2*j)+k, canvas, flags[i],
SkToBool(j), SkToBool(k));
}
}
}
}
virtual uint32_t onGetFlags() const SK_OVERRIDE { return kSkipPicture_Flag; }
private:
void drawTestPattern(int x, int y, SkCanvas* canvas,
SkCanvas::SaveFlags flags, bool doClip, bool doScale) {
canvas->save();
canvas->translate(SkIntToScalar(x*WIDTH), SkIntToScalar(y*HEIGHT));
canvas->drawRect(fOutlineRect, fStrokePaint);
canvas->save(flags);
if(doClip) {
canvas->clipPath(fPath);
}
if (doScale) {
canvas->scale(SkDoubleToScalar(0.5), SkDoubleToScalar(0.5));
}
canvas->restore();
canvas->drawRect(fFillRect, fFillPaint);
canvas->restore();
}
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
class CanvasLayerStateGM : public GM {
public:
CanvasLayerStateGM() {
fBluePaint.setColor(SK_ColorBLUE);
fBluePaint.setStyle(SkPaint::kFill_Style);
fRect = SkRect::MakeXYWH(SPACER, SPACER, WIDTH-(2*SPACER), (HEIGHT-(2*SPACER)) / 7);
}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("canvas-layer-state");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(WIDTH, HEIGHT);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
// clear the canvas to red
canvas->drawColor(SK_ColorRED);
// both rects should appear
drawTestPattern(canvas, 255, SkCanvas::kARGB_NoClipLayer_SaveFlag);
canvas->translate(0, 2*(fRect.height() + 10));
// only the top rect should appear
drawTestPattern(canvas, 255, SkCanvas::kARGB_ClipLayer_SaveFlag);
canvas->translate(0, 2*(fRect.height() + 10));
// only the bottom rect should appear
drawTestPattern(canvas, 0, SkCanvas::kARGB_NoClipLayer_SaveFlag);
}
virtual uint32_t onGetFlags() const SK_OVERRIDE { return kSkipGPU_Flag; }
private:
// draw a rect within the layer's bounds and again outside the layer's bounds
void drawTestPattern(SkCanvas* canvas, U8CPU layerAlpha, SkCanvas::SaveFlags flags) {
canvas->saveLayerAlpha(&fRect, layerAlpha, flags);
canvas->drawRect(fRect, fBluePaint);
canvas->translate(0, fRect.height() + 10);
canvas->drawRect(fRect, fBluePaint);
canvas->restore();
}
enum {
WIDTH = 400,
HEIGHT = 400,
SPACER = 10,
};
SkPaint fBluePaint;
SkRect fRect;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return SkNEW(CanvasStateGM); )
DEF_GM( return SkNEW(CanvasLayerStateGM); )
} // end namespace
|
