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
214
215
216
217
218
219
220
221
222
223
|
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "Resources.h"
#include "SkCanvas.h"
#include "SkImage.h"
#include "SkPath.h"
#include "SkPoint3.h"
#include "SkShadowUtils.h"
////////////////////////////////////////////////////////////////////////////
// Sample to demonstrate tonal color shadows
class ShadowColorView : public SampleView {
SkPath fRectPath;
int fZIndex;
bool fShowAmbient;
bool fShowSpot;
bool fUseAlt;
bool fShowObject;
bool fTwoPassColor;
bool fDarkBackground;
public:
ShadowColorView()
: fZIndex(8)
, fShowAmbient(true)
, fShowSpot(true)
, fUseAlt(false)
, fShowObject(true)
, fTwoPassColor(false)
, fDarkBackground(false) {}
protected:
void onOnceBeforeDraw() override {
fRectPath.addRect(SkRect::MakeXYWH(-50, -50, 100, 100));
}
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "ShadowColor");
return true;
}
SkUnichar uni;
if (SampleCode::CharQ(*evt, &uni)) {
bool handled = false;
switch (uni) {
case 'W':
fShowAmbient = !fShowAmbient;
handled = true;
break;
case 'S':
fShowSpot = !fShowSpot;
handled = true;
break;
case 'T':
fUseAlt = !fUseAlt;
handled = true;
break;
case 'O':
fShowObject = !fShowObject;
handled = true;
break;
case 'X':
fTwoPassColor = !fTwoPassColor;
handled = true;
break;
case 'Z':
fDarkBackground = !fDarkBackground;
handled = true;
break;
case '>':
fZIndex = SkTMin(9, fZIndex+1);
handled = true;
break;
case '<':
fZIndex = SkTMax(0, fZIndex-1);
handled = true;
break;
default:
break;
}
if (handled) {
this->inval(nullptr);
return true;
}
}
return this->INHERITED::onQuery(evt);
}
void drawShadowedPath(SkCanvas* canvas, const SkPath& path,
const SkPoint3& zPlaneParams,
const SkPaint& paint, SkScalar ambientAlpha,
const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) {
if (!fShowAmbient) {
ambientAlpha = 0;
}
if (!fShowSpot) {
spotAlpha = 0;
}
uint32_t flags = 0;
if (fUseAlt) {
flags |= SkShadowFlags::kGeometricOnly_ShadowFlag;
}
if (fTwoPassColor) {
SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
lightPos, lightWidth,
ambientAlpha, 0, SK_ColorBLACK, flags);
if (paint.getColor() != SK_ColorBLACK) {
SkColor color = paint.getColor();
uint8_t max = SkTMax(SkTMax(SkColorGetR(color), SkColorGetG(color)),
SkColorGetB(color));
uint8_t min = SkTMin(SkTMin(SkColorGetR(color), SkColorGetG(color)),
SkColorGetB(color));
SkScalar luminance = 0.5f*(max + min) / 255.f;
SkScalar alpha = (.6 - .4*luminance)*luminance*luminance + 0.3f;
spotAlpha -= (alpha - 0.3f)*.5f;
SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
lightPos, lightWidth,
0, alpha, paint.getColor(), flags);
}
SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
lightPos, lightWidth,
0, spotAlpha, SK_ColorBLACK, flags);
} else {
flags |= SkShadowFlags::kTonalColor_ShadowFlag;
SkShadowUtils::DrawShadow(canvas, path, zPlaneParams,
lightPos, lightWidth,
ambientAlpha, spotAlpha, paint.getColor(), flags);
}
if (fShowObject) {
canvas->drawPath(path, paint);
} else {
SkPaint strokePaint;
strokePaint.setColor(paint.getColor());
strokePaint.setStyle(SkPaint::kStroke_Style);
canvas->drawPath(path, strokePaint);
}
}
void onDrawContent(SkCanvas* canvas) override {
const SkScalar kLightWidth = 600;
const SkScalar kAmbientAlpha = 0.03f;
const SkScalar kSpotAlpha = 0.25f;
const SkScalar kZValues[10] = { 1, 2, 3, 4, 6, 8, 9, 12, 16, 24 };
const SkColor kColors[30] = {
// purples
0xFF3A0072, 0xFF5D0099, 0xFF7F12B2, 0xFFA02AD1, 0xFFC245E5,
0xFFE95AF9, 0xFFFC79F0, 0xFFFDA6F0, 0xFFFFCCF8, 0xFFFFE1F9,
// oranges
0xFFEA3200, 0xFFFF4E00, 0xFFFF7300, 0xFFFF9100, 0xFFFFB000,
0xFFFFCE00, 0xFFFFE000, 0xFFFFF64D, 0xFFFFF98F, 0xFFFFFBCC,
// teals
0xFF004D51, 0xFF066266, 0xFF057F7F, 0xFF009999, 0xFF00B2B2,
0xFF15CCBE, 0xFF25E5CE, 0xFF2CFFE0, 0xFF80FFEA, 0xFFB3FFF0
};
SkPaint paint;
paint.setAntiAlias(true);
if (fDarkBackground) {
canvas->drawColor(0xFF111111);
paint.setColor(SK_ColorWHITE);
} else {
canvas->drawColor(0xFFEAEAEA);
paint.setColor(SK_ColorBLACK);
}
if (fTwoPassColor) {
canvas->drawText("Two pass", 8, 10, 15, paint);
} else {
canvas->drawText("One pass", 8, 10, 15, paint);
}
SkPoint3 lightPos = { 75, -400, 600 };
SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, kZValues[fZIndex]);
SkScalar yPos = 75;
for (int row = 0; row < 3; ++row) {
lightPos.fX = 75;
SkScalar xPos = 75;
for (int col = 0; col < 10; ++col) {
paint.setColor(kColors[10*row + col]);
canvas->save();
canvas->translate(xPos, yPos);
this->drawShadowedPath(canvas, fRectPath, zPlaneParams, paint, kAmbientAlpha,
lightPos, kLightWidth, kSpotAlpha);
canvas->restore();
lightPos.fX += 120;
xPos += 120;
}
lightPos.fY += 200;
yPos += 200;
}
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ShadowColorView; }
static SkViewRegister reg(MyFactory);
|
