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
23class CameraView : public SampleView {
24    SkTArray<sk_sp<SkShader>> fShaders;
25    int     fShaderIndex;
26    bool    fFrontFace;
27public:
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
54protected:
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
97private:
98    SkScalar fRX, fRY, fRZ;
99    typedef SampleView INHERITED;
100};
101
102//////////////////////////////////////////////////////////////////////////////
103
104static SkView* MyFactory() { return new CameraView; }
105static SkViewRegister reg(MyFactory);
106