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 "Sample.h"
9 #include "Resources.h"
10 #include "SkAnimTimer.h"
11 #include "SkCanvas.h"
12 #include "SkFont.h"
13 #include "SkRSXform.h"
14 #include "SkSurface.h"
15 #include "Timer.h"
16
17 #include <stdio.h>
18
19 static const int kGrid = 100;
20 static const int kWidth = 960;
21 static const int kHeight = 640;
22
23 typedef void (*DrawAtlasProc)(SkCanvas*, SkImage*, const SkRSXform[], const SkRect[],
24 const SkColor[], int, const SkRect*, const SkPaint*);
25
draw_atlas(SkCanvas * canvas,SkImage * atlas,const SkRSXform xform[],const SkRect tex[],const SkColor colors[],int count,const SkRect * cull,const SkPaint * paint)26 static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
27 const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
28 const SkPaint* paint) {
29 canvas->drawAtlas(atlas, xform, tex, colors, count, SkBlendMode::kModulate, cull, paint);
30 }
31
draw_atlas_sim(SkCanvas * canvas,SkImage * atlas,const SkRSXform xform[],const SkRect tex[],const SkColor colors[],int count,const SkRect * cull,const SkPaint * paint)32 static void draw_atlas_sim(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
33 const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
34 const SkPaint* paint) {
35 for (int i = 0; i < count; ++i) {
36 SkMatrix matrix;
37 matrix.setRSXform(xform[i]);
38
39 canvas->save();
40 canvas->concat(matrix);
41 canvas->drawImageRect(atlas, tex[i], tex[i].makeOffset(-tex[i].x(), -tex[i].y()), paint,
42 SkCanvas::kFast_SrcRectConstraint);
43 canvas->restore();
44 }
45 }
46
47
48 class DrawShipView : public Sample {
49 public:
DrawShipView(const char name[],DrawAtlasProc proc)50 DrawShipView(const char name[], DrawAtlasProc proc) : fName(name), fProc(proc) {
51 fAtlas = GetResourceAsImage("images/ship.png");
52 if (!fAtlas) {
53 SkDebugf("\nCould not decode file ship.png. Falling back to penguin mode.\n");
54 fAtlas = GetResourceAsImage("images/baby_tux.png");
55 if (!fAtlas) {
56 SkDebugf("\nCould not decode file baby_tux.png. Did you forget"
57 " to set the resourcePath?\n");
58 return;
59 }
60 }
61
62 SkScalar anchorX = fAtlas->width()*0.5f;
63 SkScalar anchorY = fAtlas->height()*0.5f;
64 int currIndex = 0;
65 for (int x = 0; x < kGrid; x++) {
66 for (int y = 0; y < kGrid; y++) {
67 float xPos = (x / (kGrid - 1.0f)) * kWidth;
68 float yPos = (y / (kGrid - 1.0f)) * kWidth;
69
70 fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
71 SkIntToScalar(fAtlas->width()),
72 SkIntToScalar(fAtlas->height()));
73 fXform[currIndex] = SkRSXform::MakeFromRadians(0.1f, SK_ScalarPI*0.5f,
74 xPos, yPos, anchorX, anchorY);
75 currIndex++;
76 }
77 }
78 fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
79 SkIntToScalar(fAtlas->width()),
80 SkIntToScalar(fAtlas->height()));
81 fXform[currIndex] = SkRSXform::MakeFromRadians(0.5f, SK_ScalarPI*0.5f,
82 kWidth*0.5f, kHeight*0.5f, anchorX, anchorY);
83
84 fCurrentTime = 0;
85 fTimer.start();
86 }
87
~DrawShipView()88 ~DrawShipView() override {}
89
90 protected:
onQuery(Sample::Event * evt)91 bool onQuery(Sample::Event* evt) override {
92 if (Sample::TitleQ(*evt)) {
93 Sample::TitleR(evt, fName);
94 return true;
95 }
96 return this->INHERITED::onQuery(evt);
97 }
98
onDrawContent(SkCanvas * canvas)99 void onDrawContent(SkCanvas* canvas) override {
100 const float kCosDiff = 0.99984769515f;
101 const float kSinDiff = 0.01745240643f;
102
103 if (!fAtlas) {
104 return;
105 }
106
107 SkPaint paint;
108 paint.setFilterQuality(kLow_SkFilterQuality);
109 paint.setColor(SK_ColorWHITE);
110
111 SkFont font;
112 font.setSize(15.0f);
113
114 fTimer.end();
115
116 fTimes[fCurrentTime] = (float)(fTimer.fWall);
117 fCurrentTime = (fCurrentTime + 1) & 0x1f;
118
119 float meanTime = 0.0f;
120 for (int i = 0; i < 32; ++i) {
121 meanTime += fTimes[i];
122 }
123 meanTime /= 32.f;
124 SkString outString("fps: ");
125 SkScalar fps = 1000.f/meanTime;
126 outString.appendScalar(fps);
127 outString.append(" ms: ");
128 outString.appendScalar(meanTime);
129
130 fTimer.start();
131
132 SkScalar anchorX = fAtlas->width()*0.5f;
133 SkScalar anchorY = fAtlas->height()*0.5f;
134 for (int i = 0; i < kGrid*kGrid+1; ++i) {
135 SkScalar c = fXform[i].fSCos;
136 SkScalar s = fXform[i].fSSin;
137
138 SkScalar dx = c*anchorX - s*anchorY;
139 SkScalar dy = s*anchorX + c*anchorY;
140
141 fXform[i].fSCos = kCosDiff*c - kSinDiff*s;
142 fXform[i].fSSin = kSinDiff*c + kCosDiff*s;
143
144 dx -= fXform[i].fSCos*anchorX - fXform[i].fSSin*anchorY;
145 dy -= fXform[i].fSSin*anchorX + fXform[i].fSCos*anchorY;
146 fXform[i].fTx += dx;
147 fXform[i].fTy += dy;
148 }
149
150 fProc(canvas, fAtlas.get(), fXform, fTex, nullptr, kGrid*kGrid+1, nullptr, &paint);
151 paint.setColor(SK_ColorBLACK);
152 canvas->drawRect(SkRect::MakeXYWH(0, 0, 200, 24), paint);
153 paint.setColor(SK_ColorWHITE);
154 canvas->drawString(outString, 5, 15, font, paint);
155 }
156
157 #if 0
158 // TODO: switch over to use this for our animation
159 bool onAnimate(const SkAnimTimer& timer) override {
160 SkScalar angle = SkDoubleToScalar(fmod(timer.secs() * 360 / 24, 360));
161 fAnimatingDrawable->setSweep(angle);
162 return true;
163 }
164 #endif
165
166 private:
167 const char* fName;
168 DrawAtlasProc fProc;
169
170 sk_sp<SkImage> fAtlas;
171 SkRSXform fXform[kGrid*kGrid+1];
172 SkRect fTex[kGrid*kGrid+1];
173 WallTimer fTimer;
174 float fTimes[32];
175 int fCurrentTime;
176
177
178 typedef Sample INHERITED;
179 };
180
181 //////////////////////////////////////////////////////////////////////////////
182
183 DEF_SAMPLE( return new DrawShipView("DrawShip", draw_atlas); )
184 DEF_SAMPLE( return new DrawShipView("DrawShipSim", draw_atlas_sim); )
185
