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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "SampleCode.h"
      9 #include "SkView.h"
     10 #include "SkCanvas.h"
     11 #include "SkDevice.h"
     12 #include "SkPaint.h"
     13 #include "SkShader.h"
     14 
     15 static SkBitmap createBitmap(int n) {
     16     SkBitmap bitmap;
     17     bitmap.allocN32Pixels(n, n);
     18     bitmap.eraseColor(SK_ColorTRANSPARENT);
     19 
     20     SkCanvas canvas(bitmap);
     21     SkRect r;
     22     r.set(0, 0, SkIntToScalar(n), SkIntToScalar(n));
     23     SkPaint paint;
     24     paint.setAntiAlias(true);
     25 
     26     paint.setColor(SK_ColorRED);
     27     canvas.drawOval(r, paint);
     28     paint.setColor(SK_ColorBLUE);
     29     paint.setStrokeWidth(SkIntToScalar(n)/15);
     30     paint.setStyle(SkPaint::kStroke_Style);
     31     canvas.drawLine(0, 0, r.fRight, r.fBottom, paint);
     32     canvas.drawLine(0, r.fBottom, r.fRight, 0, paint);
     33 
     34     return bitmap;
     35 }
     36 
     37 class MipMapView : public SampleView {
     38     SkBitmap fBitmap;
     39     enum {
     40         N = 64
     41     };
     42     bool fOnce;
     43 public:
     44     MipMapView() {
     45         fOnce = false;
     46     }
     47 
     48     void init() {
     49         if (fOnce) {
     50             return;
     51         }
     52         fOnce = true;
     53 
     54         fBitmap = createBitmap(N);
     55 
     56         fWidth = N;
     57     }
     58 
     59 protected:
     60     // overrides from SkEventSink
     61     virtual bool onQuery(SkEvent* evt) {
     62         if (SampleCode::TitleQ(*evt)) {
     63             SampleCode::TitleR(evt, "MipMaps");
     64             return true;
     65         }
     66         return this->INHERITED::onQuery(evt);
     67     }
     68 
     69     virtual void onDrawContent(SkCanvas* canvas) {
     70         this->init();
     71 
     72         static const SkPaint::FilterLevel gLevel[] = {
     73             SkPaint::kNone_FilterLevel,
     74             SkPaint::kLow_FilterLevel,
     75             SkPaint::kMedium_FilterLevel,
     76             SkPaint::kHigh_FilterLevel,
     77         };
     78 
     79         SkPaint paint;
     80 
     81         for (size_t i = 0; i < SK_ARRAY_COUNT(gLevel); ++i) {
     82             SkScalar x = 10.0f + i * 100;
     83             SkScalar y = 10.0f;
     84 
     85             paint.setFilterLevel(gLevel[i]);
     86 
     87             canvas->drawBitmap(fBitmap, x, y, &paint);
     88         }
     89         this->inval(NULL);
     90     }
     91 
     92 private:
     93     int fWidth;
     94 
     95     typedef SampleView INHERITED;
     96 };
     97 
     98 //////////////////////////////////////////////////////////////////////////////
     99 
    100 static SkView* MyFactory() { return new MipMapView; }
    101 static SkViewRegister reg(MyFactory);
    102