aboutsummaryrefslogtreecommitdiffhomepage
path: root/samplecode/SampleShip.cpp
blob: fddf0235baf7836de550e0f313b70f155427f100 (plain)
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
/*
 * Copyright 2015 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 "SkAnimTimer.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkRSXform.h"
#include "SkSurface.h"
#include "Timer.h"

#include <stdio.h>

static const int kGrid = 100;
static const int kWidth = 960;
static const int kHeight = 640;

typedef void (*DrawAtlasProc)(SkCanvas*, SkImage*, const SkRSXform[], const SkRect[],
const SkColor[], int, const SkRect*, const SkPaint*);

static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
                       const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
                       const SkPaint* paint) {
    canvas->drawAtlas(atlas, xform, tex, colors, count, SkXfermode::kModulate_Mode, cull, paint);
}

static void draw_atlas_sim(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
                           const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
                           const SkPaint* paint) {
    for (int i = 0; i < count; ++i) {
        SkMatrix matrix;
        matrix.setRSXform(xform[i]);
        
        canvas->save();
        canvas->concat(matrix);
        canvas->drawImageRect(atlas, tex[i], tex[i].makeOffset(-tex[i].x(), -tex[i].y()), paint,
                              SkCanvas::kFast_SrcRectConstraint);
        canvas->restore();
    }
}


class DrawShipView : public SampleView {
public:
    DrawShipView(const char name[], DrawAtlasProc proc) : fName(name), fProc(proc) {
        fAtlas.reset(GetResourceAsImage("ship.png"));
        if (!fAtlas) {
            SkDebugf("\nCould not decode file ship.png. Falling back to penguin mode.\n");
            fAtlas.reset(GetResourceAsImage("baby_tux.png"));
            if (!fAtlas) {
                SkDebugf("\nCould not decode file baby_tux.png. Did you forget"
                         " to set the resourcePath?\n");
                return;
            }
        }
        
        SkScalar anchorX = fAtlas->width()*0.5f;
        SkScalar anchorY = fAtlas->height()*0.5f;
        int currIndex = 0;
        for (int x = 0; x < kGrid; x++) {
            for (int y = 0; y < kGrid; y++) {
                float xPos = (x / (kGrid - 1.0f)) * kWidth;
                float yPos = (y / (kGrid - 1.0f)) * kWidth;
                
                fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
                                                   SkIntToScalar(fAtlas->width()),
                                                   SkIntToScalar(fAtlas->height()));
                fXform[currIndex] = SkRSXform::MakeFromRadians(0.1f, SK_ScalarPI*0.5f,
                                                               xPos, yPos, anchorX, anchorY);
                currIndex++;
            }
        }
        fTex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f,
                                           SkIntToScalar(fAtlas->width()),
                                           SkIntToScalar(fAtlas->height()));
        fXform[currIndex] = SkRSXform::MakeFromRadians(0.5f, SK_ScalarPI*0.5f,
                                                       kWidth*0.5f, kHeight*0.5f, anchorX, anchorY);
        
        fCurrentTime = 0;
        fTimer.start();
    }

    ~DrawShipView() override {}
    
protected:
    // overrides from SkEventSink
    bool onQuery(SkEvent* evt) override {
        if (SampleCode::TitleQ(*evt)) {
            SampleCode::TitleR(evt, fName);
            return true;
        }
        return this->INHERITED::onQuery(evt);
    }
    
    void onDrawContent(SkCanvas* canvas) override {
        const float kCosDiff = 0.99984769515f;
        const float kSinDiff = 0.01745240643f;
        
        if (!fAtlas) {
            return;
        }
        
        SkPaint paint;
        paint.setFilterQuality(kLow_SkFilterQuality);
        paint.setColor(SK_ColorWHITE);
        paint.setTextSize(15.0f);
        
        fTimer.end();
        
        fTimes[fCurrentTime] = (float)(fTimer.fWall);
        fCurrentTime = (fCurrentTime + 1) & 0x1f;
        
        float meanTime = 0.0f;
        for (int i = 0; i < 32; ++i) {
            meanTime += fTimes[i];
        }
        meanTime /= 32.f;
        SkString outString("fps: ");
        SkScalar fps = 1000.f/meanTime;
        outString.appendScalar(fps);
        outString.append(" ms: ");
        outString.appendScalar(meanTime);
        
        fTimer.start();
        
        SkScalar anchorX = fAtlas->width()*0.5f;
        SkScalar anchorY = fAtlas->height()*0.5f;
        for (int i = 0; i < kGrid*kGrid+1; ++i) {
            SkScalar c = fXform[i].fSCos;
            SkScalar s = fXform[i].fSSin;
            
            SkScalar dx = c*anchorX - s*anchorY;
            SkScalar dy = s*anchorX + c*anchorY;
            
            fXform[i].fSCos = kCosDiff*c - kSinDiff*s;
            fXform[i].fSSin = kSinDiff*c + kCosDiff*s;
            
            dx -= fXform[i].fSCos*anchorX - fXform[i].fSSin*anchorY;
            dy -= fXform[i].fSSin*anchorX + fXform[i].fSCos*anchorY;
            fXform[i].fTx += dx;
            fXform[i].fTy += dy;
        }
        
        fProc(canvas, fAtlas, fXform, fTex, nullptr, kGrid*kGrid+1, nullptr, &paint);
        paint.setColor(SK_ColorBLACK);
        canvas->drawRect(SkRect::MakeXYWH(0, 0, 200, 24), paint);
        paint.setColor(SK_ColorWHITE);
        canvas->drawText(outString.c_str(), outString.size(), 5, 15, paint);

        this->inval(nullptr);
    }

#if 0
    // TODO: switch over to use this for our animation
    bool onAnimate(const SkAnimTimer& timer) override {
        SkScalar angle = SkDoubleToScalar(fmod(timer.secs() * 360 / 24, 360));
        fAnimatingDrawable->setSweep(angle);
        return true;
    }
#endif

private:
    const char*         fName;
    DrawAtlasProc       fProc;
    
    SkAutoTUnref<SkImage> fAtlas;
    SkRSXform   fXform[kGrid*kGrid+1];
    SkRect      fTex[kGrid*kGrid+1];
    WallTimer   fTimer;
    float       fTimes[32];
    int         fCurrentTime;
    
    
    typedef SampleView INHERITED;
};

//////////////////////////////////////////////////////////////////////////////

DEF_SAMPLE( return new DrawShipView("DrawShip", draw_atlas); )
DEF_SAMPLE( return new DrawShipView("DrawShipSim", draw_atlas_sim); )