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 
8 #include "DecodeFile.h"
9 #include "SampleCode.h"
10 #include "SkAnimTimer.h"
11 #include "SkView.h"
12 #include "SkCanvas.h"
13 #include "SkCamera.h"
14 #include "SkEmbossMaskFilter.h"
15 #include "SkGradientShader.h"
16 #include "SkPath.h"
17 #include "SkRandom.h"
18 #include "SkRegion.h"
19 #include "SkShader.h"
20 #include "SkString.h"
21 #include "SkUtils.h"
22 
23 class CameraView : public SampleView {
24     SkTArray<sk_sp<SkShader>> fShaders;
25     int     fShaderIndex;
26     bool    fFrontFace;
27 public:
28     CameraView() {
29         fRX = fRY = fRZ = 0;
30         fShaderIndex = 0;
31         fFrontFace = false;
32 
33         for (int i = 0;; i++) {
34             SkString str;
35             str.printf("/skimages/elephant%d.jpeg", i);
36             SkBitmap bm;
37             if (decode_file(str.c_str(), &bm)) {
38                 SkRect src = { 0, 0, SkIntToScalar(bm.width()), SkIntToScalar(bm.height()) };
39                 SkRect dst = { -150, -150, 150, 150 };
40                 SkMatrix matrix;
41                 matrix.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit);
42 
43                 fShaders.push_back(SkShader::MakeBitmapShader(bm,
44                                                            SkShader::kClamp_TileMode,
45                                                            SkShader::kClamp_TileMode,
46                                                            &matrix));
47             } else {
48                 break;
49             }
50         }
51         this->setBGColor(0xFFDDDDDD);
52     }
53 
54 protected:
55     // overrides from SkEventSink
56     bool onQuery(SkEvent* evt) override {
57         if (SampleCode::TitleQ(*evt)) {
58             SampleCode::TitleR(evt, "Camera");
59             return true;
60         }
61         return this->INHERITED::onQuery(evt);
62     }
63 
64     void onDrawContent(SkCanvas* canvas) override {
65         canvas->translate(this->width()/2, this->height()/2);
66 
67         Sk3DView    view;
68         view.rotateX(fRX);
69         view.rotateY(fRY);
70         view.applyToCanvas(canvas);
71 
72         SkPaint paint;
73         if (fShaders.count() > 0) {
74             bool frontFace = view.dotWithNormal(0, 0, SK_Scalar1) < 0;
75             if (frontFace != fFrontFace) {
76                 fFrontFace = frontFace;
77                 fShaderIndex = (fShaderIndex + 1) % fShaders.count();
78             }
79 
80             paint.setAntiAlias(true);
81             paint.setShader(fShaders[fShaderIndex]);
82             paint.setFilterQuality(kLow_SkFilterQuality);
83             SkRect r = { -150, -150, 150, 150 };
84             canvas->drawRoundRect(r, 30, 30, paint);
85         }
86     }
87 
88     bool onAnimate(const SkAnimTimer& timer) override {
89         if (timer.isStopped()) {
90             fRY = 0;
91         } else {
92             fRY = timer.scaled(90, 360);
93         }
94         return true;
95     }
96 
97 private:
98     SkScalar fRX, fRY, fRZ;
99     typedef SampleView INHERITED;
100 };
101 
102 //////////////////////////////////////////////////////////////////////////////
103 
104 static SkView* MyFactory() { return new CameraView; }
105 static SkViewRegister reg(MyFactory);
106