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reed@android.com8a1c16f2008-12-17 15:59:43 +00001#include "SampleCode.h"
2#include "SkView.h"
3#include "SkCanvas.h"
4#include "SkGradientShader.h"
5#include "SkPath.h"
6#include "SkRegion.h"
7#include "SkShader.h"
8#include "SkUtils.h"
reed@android.com8a1c16f2008-12-17 15:59:43 +00009#include "Sk1DPathEffect.h"
10#include "SkCornerPathEffect.h"
11#include "SkPathMeasure.h"
12#include "SkRandom.h"
13#include "SkColorPriv.h"
14#include "SkColorFilter.h"
15#include "SkDither.h"
16
17static void draw_sweep(SkCanvas* c, int width, int height, SkScalar angle) {
18 SkRect r;
19 SkPaint p;
20
21 p.setAntiAlias(true);
22// p.setDither(true);
23 p.setStrokeWidth(SkIntToScalar(width/10));
24 p.setStyle(SkPaint::kStroke_Style);
25
26 r.set(0, 0, SkIntToScalar(width), SkIntToScalar(height));
27
28 // SkColor colors[] = { SK_ColorRED, SK_ColorBLUE, SK_ColorGREEN, SK_ColorCYAN };
29 SkColor colors[] = { 0x4c737373, 0x4c737373, 0xffffd300 };
30 SkShader* s = SkGradientShader::CreateSweep(r.centerX(), r.centerY(),
31 colors, NULL, SK_ARRAY_COUNT(colors));
32 p.setShader(s)->unref();
33
34 SkAutoCanvasRestore acr(c, true);
35
36 c->translate(r.centerX(), r.centerY());
37 c->rotate(angle);
38 c->translate(-r.centerX(), -r.centerY());
39
40 SkRect bounds = r;
41 r.inset(p.getStrokeWidth(), p.getStrokeWidth());
42 SkRect innerBounds = r;
43
44 if (true) {
45 c->drawOval(r, p);
46 } else {
47 SkScalar x = r.centerX();
48 SkScalar y = r.centerY();
49 SkScalar radius = r.width() / 2;
50 SkScalar thickness = p.getStrokeWidth();
51 SkScalar sweep = SkFloatToScalar(360.0f);
52 SkPath path;
53
54 path.moveTo(x + radius, y);
55 // outer top
56 path.lineTo(x + radius + thickness, y);
57 // outer arc
58 path.arcTo(bounds, 0, sweep, false);
59 // inner arc
60 path.arcTo(innerBounds, sweep, -sweep, false);
61 path.close();
62 }
63}
64
65static void make_bm(SkBitmap* bm)
66{
67 bm->setConfig(SkBitmap::kARGB_8888_Config, 100, 100);
68 bm->allocPixels();
69#if 0
70 bm->eraseColor(SK_ColorBLUE);
71 return;
72#else
73 bm->eraseColor(0);
74#endif
75
76 SkCanvas c(*bm);
77 draw_sweep(&c, bm->width(), bm->height(), 0);
78}
79
80static void pre_dither(const SkBitmap& bm)
81{
82 SkAutoLockPixels alp(bm);
83
84 for (unsigned y = 0; y < bm.height(); y++) {
85 DITHER_4444_SCAN(y);
86
87 SkPMColor* p = bm.getAddr32(0, y);
88 for (unsigned x = 0; x < bm.width(); x++) {
89 SkPMColor c = *p;
90
91 unsigned a = SkGetPackedA32(c);
92 unsigned r = SkGetPackedR32(c);
93 unsigned g = SkGetPackedG32(c);
94 unsigned b = SkGetPackedB32(c);
95
96 unsigned d = DITHER_VALUE(x);
97
98 a = SkDITHER_A32To4444(a, d);
99 r = SkDITHER_R32To4444(r, d);
100 g = SkDITHER_G32To4444(g, d);
101 b = SkDITHER_B32To4444(b, d);
102
103 a = SkA4444ToA32(a);
104 r = SkR4444ToR32(r);
105 g = SkG4444ToG32(g);
106 b = SkB4444ToB32(b);
107
108 *p++ = SkPackARGB32(a, r, g, b);
109 }
110 }
111}
112
113class DitherView : public SkView {
114public:
115 SkBitmap fBM, fBMPreDither, fBM16;
116 SkScalar fAngle;
117
118 DitherView() {
119 make_bm(&fBM);
120 make_bm(&fBMPreDither);
121 pre_dither(fBMPreDither);
122 fBM.copyTo(&fBM16, SkBitmap::kARGB_4444_Config);
123
124 fAngle = 0;
125 }
126
127protected:
128 // overrides from SkEventSink
129 virtual bool onQuery(SkEvent* evt) {
130 if (SampleCode::TitleQ(*evt)) {
131 SampleCode::TitleR(evt, "Dither");
132 return true;
133 }
134 return this->INHERITED::onQuery(evt);
135 }
136
137 void drawBG(SkCanvas* canvas) {
138// canvas->drawColor(0xFFDDDDDD);
139 canvas->drawColor(0xFF181818);
140 }
141
142 virtual void onDraw(SkCanvas* canvas) {
143 this->drawBG(canvas);
144
145 SkPaint paint;
146 SkScalar x = SkIntToScalar(10);
147 SkScalar y = SkIntToScalar(10);
148 const SkScalar DX = SkIntToScalar(fBM.width() + 10);
149
150 paint.setAntiAlias(true);
151
152 if (true) {
153 canvas->drawBitmap(fBM, x, y, &paint);
154 x += DX;
155 paint.setDither(true);
156 canvas->drawBitmap(fBM, x, y, &paint);
157
158 x += DX;
159 paint.setDither(false);
160 canvas->drawBitmap(fBMPreDither, x, y, &paint);
161
162 x += DX;
163 canvas->drawBitmap(fBM16, x, y, &paint);
164 }
165
166 canvas->translate(DX, DX*2);
167 draw_sweep(canvas, fBM.width(), fBM.height(), fAngle);
168 canvas->translate(DX, 0);
169 draw_sweep(canvas, fBM.width()>>1, fBM.height()>>1, fAngle);
170 canvas->translate(DX, 0);
171 draw_sweep(canvas, fBM.width()>>2, fBM.height()>>2, fAngle);
172
173 fAngle += SK_Scalar1/2;
174 this->inval(NULL);
175 }
176
177 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y)
178 {
179 // fSweep += SK_Scalar1;
180 this->inval(NULL);
181 return this->INHERITED::onFindClickHandler(x, y);
182 }
183
184 virtual bool onClick(Click* click)
185 {
186 return this->INHERITED::onClick(click);
187 }
188
189private:
190 typedef SkView INHERITED;
191};
192
193//////////////////////////////////////////////////////////////////////////////
194
195static SkView* MyFactory() { return new DitherView; }
196static SkViewRegister reg(MyFactory);
197