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