OLD | NEW |
| (Empty) |
1 /* | |
2 * Copyright 2015 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 | |
8 #include "SampleCode.h" | |
9 #include "SkView.h" | |
10 #include "SkCanvas.h" | |
11 #include "SkUtils.h" | |
12 #include "SkColorPriv.h" | |
13 #include "SkColorFilter.h" | |
14 #include "SkGpuDevice.h" | |
15 #include "SkRandom.h" | |
16 #include "SkSystemEventTypes.h" | |
17 #include "SkTime.h" | |
18 #include "SkTypeface.h" | |
19 #include "SkXfermode.h" | |
20 #include "Timer.h" | |
21 | |
22 #include "GrContext.h" | |
23 | |
24 SkRandom gRand; | |
25 | |
26 static void DrawTheText(SkCanvas* canvas, const char text[], size_t length, SkSc
alar x, SkScalar y, | |
27 const SkPaint& paint) { | |
28 SkPaint p(paint); | |
29 | |
30 p.setSubpixelText(true); | |
31 canvas->drawText(text, length, x, y, p); | |
32 } | |
33 | |
34 // This sample demonstrates the cache behavior of bitmap vs. distance field text | |
35 // It renders variously sized text with an animated scale and rotation. | |
36 // Specifically one should: | |
37 // use 'D' to toggle between bitmap and distance field fonts | |
38 // use '2' to toggle between scaling the image by 2x | |
39 // -- this feature boosts the rendering out of the small point-size | |
40 // SDF-text special case (which falls back to bitmap fonts for sma
ll points) | |
41 | |
42 class AnimatedTextView : public SampleView { | |
43 public: | |
44 AnimatedTextView() : fScale(1.0f), fScaleInc(0.1f), fRotation(0.0f), fSizeSc
ale(1) { | |
45 fCurrentTime = 0; | |
46 fTimer.start(); | |
47 memset(fTimes, 0, sizeof(fTimes)); | |
48 } | |
49 | |
50 protected: | |
51 // overrides from SkEventSink | |
52 bool onQuery(SkEvent* evt) override { | |
53 if (SampleCode::TitleQ(*evt)) { | |
54 SampleCode::TitleR(evt, "AnimatedText"); | |
55 return true; | |
56 } | |
57 | |
58 SkUnichar uni; | |
59 if (SampleCode::CharQ(*evt, &uni)) { | |
60 if ('2' == uni) { | |
61 if (fSizeScale == 2) { | |
62 fSizeScale = 1; | |
63 } else { | |
64 fSizeScale = 2; | |
65 } | |
66 return true; | |
67 } | |
68 } | |
69 return this->INHERITED::onQuery(evt); | |
70 } | |
71 | |
72 void onDrawContent(SkCanvas* canvas) override { | |
73 SkPaint paint; | |
74 SkSafeUnref(paint.setTypeface(SkTypeface::CreateFromFile("/skimages/samp
lefont.ttf"))); | |
75 paint.setAntiAlias(true); | |
76 paint.setFilterQuality(kMedium_SkFilterQuality); | |
77 | |
78 SkString outString("fps: "); | |
79 fTimer.end(); | |
80 | |
81 // TODO: generalize this timing code in utils | |
82 fTimes[fCurrentTime] = (float)(fTimer.fWall); | |
83 fCurrentTime = (fCurrentTime + 1) & 0x1f; | |
84 | |
85 float meanTime = 0.0f; | |
86 for (int i = 0; i < 32; ++i) { | |
87 meanTime += fTimes[i]; | |
88 } | |
89 meanTime /= 32.f; | |
90 SkScalar fps = 1000.f / meanTime; | |
91 outString.appendScalar(fps); | |
92 outString.append(" ms: "); | |
93 outString.appendScalar(meanTime); | |
94 | |
95 SkString modeString("Text scale: "); | |
96 modeString.appendU32(fSizeScale); | |
97 modeString.append("x"); | |
98 | |
99 fTimer.start(); | |
100 | |
101 canvas->save(); | |
102 | |
103 SkBaseDevice* device = canvas->getDevice_just_for_deprecated_compatibili
ty_testing(); | |
104 GrContext* grContext = canvas->getGrContext(); | |
105 if (grContext) { | |
106 grContext->drawFontCache(SkRect::MakeXYWH(512, 10, 512, 512), kA8_Gr
MaskFormat, paint, | |
107 reinterpret_cast<SkGpuDevice*>(device)->acc
essRenderTarget()); | |
108 } | |
109 | |
110 canvas->translate(180, 180); | |
111 canvas->rotate(fRotation); | |
112 canvas->scale(fScale, fScale); | |
113 canvas->translate(-180, -180); | |
114 | |
115 const char* text = "Hamburgefons"; | |
116 size_t length = strlen(text); | |
117 | |
118 SkScalar y = SkIntToScalar(0); | |
119 for (int i = 12; i <= 26; i++) { | |
120 paint.setTextSize(SkIntToScalar(i*fSizeScale)); | |
121 y += paint.getFontSpacing(); | |
122 DrawTheText(canvas, text, length, SkIntToScalar(110), y, paint); | |
123 } | |
124 canvas->restore(); | |
125 | |
126 paint.setTextSize(16); | |
127 canvas->drawText(outString.c_str(), outString.size(), 512.f, 540.f, pain
t); | |
128 canvas->drawText(modeString.c_str(), modeString.size(), 768.f, 540.f, pa
int); | |
129 } | |
130 | |
131 bool onAnimate(const SkAnimTimer& timer) override { | |
132 // We add noise to the scale and rotation animations to | |
133 // keep the font atlas from falling into a steady state | |
134 fRotation += (1.0f + gRand.nextRangeF(-0.1f, 0.1f)); | |
135 fScale += (fScaleInc + gRand.nextRangeF(-0.025f, 0.025f)); | |
136 if (fScale >= 2.0f) { | |
137 fScaleInc = -0.1f; | |
138 } else if (fScale <= 1.0f) { | |
139 fScaleInc = 0.1f; | |
140 } | |
141 return true; | |
142 } | |
143 | |
144 private: | |
145 float fScale; | |
146 float fScaleInc; | |
147 float fRotation; | |
148 int fSizeScale; | |
149 | |
150 WallTimer fTimer; | |
151 float fTimes[32]; | |
152 int fCurrentTime; | |
153 | |
154 | |
155 typedef SampleView INHERITED; | |
156 }; | |
157 | |
158 ////////////////////////////////////////////////////////////////////////////// | |
159 | |
160 static SkView* MyFactory() { return new AnimatedTextView; } | |
161 static SkViewRegister reg(MyFactory); | |
OLD | NEW |