1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7 #include "Sample.h"
8 #include "SkBitmap.h"
9 #include "SkCanvas.h"
10 #include "SkPaint.h"
11 #include "SkShader.h"
12
createBitmap(int n)13 static SkBitmap createBitmap(int n) {
14 SkBitmap bitmap;
15 bitmap.allocN32Pixels(n, n);
16 bitmap.eraseColor(SK_ColorGREEN);
17
18 SkCanvas canvas(bitmap);
19 SkRect r;
20 r.set(0, 0, SkIntToScalar(n), SkIntToScalar(n));
21 SkPaint paint;
22 paint.setAntiAlias(true);
23
24 paint.setColor(SK_ColorRED);
25 canvas.drawOval(r, paint);
26 paint.setColor(SK_ColorBLUE);
27 paint.setStrokeWidth(SkIntToScalar(n)/15);
28 paint.setStyle(SkPaint::kStroke_Style);
29 canvas.drawLine(0, 0, r.fRight, r.fBottom, paint);
30 canvas.drawLine(0, r.fBottom, r.fRight, 0, paint);
31
32 return bitmap;
33 }
34
35 class AARectView : public Sample {
36 SkBitmap fBitmap;
37 enum {
38 N = 64
39 };
40
41 protected:
onOnceBeforeDraw()42 void onOnceBeforeDraw() override {
43 fBitmap = createBitmap(N);
44
45 fWidth = N;
46 }
47
onQuery(Sample::Event * evt)48 bool onQuery(Sample::Event* evt) override {
49 if (Sample::TitleQ(*evt)) {
50 Sample::TitleR(evt, "AA Rects");
51 return true;
52 }
53 return this->INHERITED::onQuery(evt);
54 }
55
onDrawContent(SkCanvas * canvas)56 void onDrawContent(SkCanvas* canvas) override {
57 canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
58
59 SkPaint bluePaint;
60 bluePaint.setARGB(0xff, 0x0, 0x0, 0xff);
61 SkPaint bmpPaint;
62 bmpPaint.setShader(SkShader::MakeBitmapShader(fBitmap, SkShader::kRepeat_TileMode,
63 SkShader::kRepeat_TileMode));
64 bluePaint.setStrokeWidth(3);
65 bmpPaint.setStrokeWidth(3);
66
67 SkPaint paints[] = { bluePaint, bmpPaint };
68
69 SkRect rect;
70
71 SkScalar dx = SkIntToScalar(80);
72 SkScalar dy = SkIntToScalar(100);
73 SkMatrix matrix;
74 for (size_t p = 0; p < SK_ARRAY_COUNT(paints); ++p) {
75 for (int stroke = 0; stroke < 2; ++stroke) {
76 paints[p].setStyle(stroke ? SkPaint::kStroke_Style : SkPaint::kFill_Style);
77 for (int a = 0; a < 3; ++ a) {
78 paints[p].setAntiAlias(a > 0);
79 paints[p].setAlpha(a > 1 ? 0x80 : 0xff);
80
81 canvas->save();
82 rect = SkRect::MakeLTRB(0.f,
83 0.f,
84 40.f,
85 40.f);
86 canvas->drawRect(rect, paints[p]);
87 canvas->translate(dx, 0);
88
89 rect = SkRect::MakeLTRB(0.5f,
90 0.5f,
91 40.5f,
92 40.5f);
93 canvas->drawRect(rect, paints[p]);
94 canvas->translate(dx, 0);
95
96 rect = SkRect::MakeLTRB(0.5f,
97 0.5f,
98 40.f,
99 40.f);
100 canvas->drawRect(rect, paints[p]);
101 canvas->translate(dx, 0);
102
103 rect = SkRect::MakeLTRB(0.75f,
104 0.75f,
105 40.75f,
106 40.75f);
107 canvas->drawRect(rect, paints[p]);
108 canvas->translate(dx, 0);
109
110 canvas->save();
111 canvas->translate(.33f, .67f);
112 rect = SkRect::MakeLTRB(0.0f,
113 0.0f,
114 40.0f,
115 40.0f);
116 canvas->drawRect(rect, paints[p]);
117 canvas->restore();
118 canvas->translate(dx, 0);
119
120 canvas->save();
121 matrix.setRotate(45.f);
122 canvas->concat(matrix);
123 canvas->translate(20.0f / sqrtf(2.f),
124 20.0f / sqrtf(2.f));
125 rect = SkRect::MakeLTRB(-20.0f,
126 -20.0f,
127 20.0f,
128 20.0f);
129 canvas->drawRect(rect, paints[p]);
130 canvas->restore();
131 canvas->translate(dx, 0);
132
133 canvas->save();
134 canvas->rotate(90.f);
135 rect = SkRect::MakeLTRB(0.0f,
136 0.0f,
137 40.0f,
138 -40.0f);
139 canvas->drawRect(rect, paints[p]);
140 canvas->restore();
141 canvas->translate(dx, 0);
142
143 canvas->save();
144 canvas->rotate(90.f);
145 rect = SkRect::MakeLTRB(0.5f,
146 0.5f,
147 40.5f,
148 -40.5f);
149 canvas->drawRect(rect, paints[p]);
150 canvas->restore();
151 canvas->translate(dx, 0);
152
153 canvas->save();
154 matrix.setScale(-1.f, -1.f);
155 canvas->concat(matrix);
156 rect = SkRect::MakeLTRB(0.5f,
157 0.5f,
158 -40.5f,
159 -40.5f);
160 canvas->drawRect(rect, paints[p]);
161 canvas->restore();
162 canvas->translate(dx, 0);
163
164 canvas->save();
165 matrix.setScale(2.1f, 4.1f);
166 canvas->concat(matrix);
167 rect = SkRect::MakeLTRB(0.1f,
168 0.1f,
169 19.1f,
170 9.1f);
171 canvas->drawRect(rect, paints[p]);
172 canvas->restore();
173 canvas->translate(dx, 0);
174
175 canvas->restore();
176 canvas->translate(0, dy);
177 }
178 }
179 }
180 }
181
182 private:
183 int fWidth;
184
185 typedef Sample INHERITED;
186 };
187
188 //////////////////////////////////////////////////////////////////////////////
189
190 DEF_SAMPLE( return new AARectView(); )
191