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