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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 "gm.h"
      9 #include "SkCanvas.h"
     10 #include "SkGraphics.h"
     11 #include "SkRandom.h"
     12 #include "SkLayerDrawLooper.h"
     13 #include "SkBlurMaskFilter.h"
     14 
     15 #define WIDTH   200
     16 #define HEIGHT  200
     17 
     18 class DrawLooperGM : public skiagm::GM {
     19 public:
     20     DrawLooperGM() : fLooper(NULL) {
     21         this->setBGColor(0xFFDDDDDD);
     22     }
     23 
     24     virtual ~DrawLooperGM() {
     25         SkSafeUnref(fLooper);
     26     }
     27 
     28 protected:
     29     virtual SkISize onISize() {
     30         return SkISize::Make(520, 160);
     31     }
     32 
     33     virtual SkString onShortName() SK_OVERRIDE {
     34         return SkString("drawlooper");
     35     }
     36 
     37     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     38         this->init();
     39 
     40         SkPaint  paint;
     41         paint.setTextSize(SkIntToScalar(72));
     42         paint.setLooper(fLooper);
     43 
     44         canvas->drawCircle(SkIntToScalar(50), SkIntToScalar(50),
     45                            SkIntToScalar(30), paint);
     46 
     47         canvas->drawRectCoords(SkIntToScalar(150), SkIntToScalar(50),
     48                                SkIntToScalar(200), SkIntToScalar(100), paint);
     49 
     50         canvas->drawText("Looper", 6, SkIntToScalar(230), SkIntToScalar(100),
     51                          paint);
     52     }
     53 
     54 private:
     55     SkLayerDrawLooper*   fLooper;
     56 
     57     void init() {
     58         if (fLooper) return;
     59 
     60         static const struct {
     61             SkColor         fColor;
     62             SkPaint::Style  fStyle;
     63             SkScalar        fWidth;
     64             SkScalar        fOffset;
     65             int             fBlur;
     66         } gParams[] = {
     67             { SK_ColorWHITE, SkPaint::kStroke_Style, SkIntToScalar(1)*3/4, 0, 0 },
     68             { SK_ColorRED, SkPaint::kStroke_Style, SkIntToScalar(4), 0, 0 },
     69             { SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0 },
     70             { 0x88000000, SkPaint::kFill_Style, 0, SkIntToScalar(10), 3 }
     71         };
     72 
     73         fLooper = new SkLayerDrawLooper;
     74 
     75         SkLayerDrawLooper::LayerInfo info;
     76         info.fFlagsMask = SkPaint::kAntiAlias_Flag;
     77         info.fPaintBits = SkLayerDrawLooper::kStyle_Bit | SkLayerDrawLooper::kMaskFilter_Bit;
     78         info.fColorMode = SkXfermode::kSrc_Mode;
     79 
     80         for (size_t i = 0; i < SK_ARRAY_COUNT(gParams); i++) {
     81             info.fOffset.set(gParams[i].fOffset, gParams[i].fOffset);
     82             SkPaint* paint = fLooper->addLayer(info);
     83             paint->setAntiAlias(true);
     84             paint->setColor(gParams[i].fColor);
     85             paint->setStyle(gParams[i].fStyle);
     86             paint->setStrokeWidth(gParams[i].fWidth);
     87             if (gParams[i].fBlur > 0) {
     88                 SkMaskFilter* mf = SkBlurMaskFilter::Create(SkIntToScalar(gParams[i].fBlur),
     89                                                             SkBlurMaskFilter::kNormal_BlurStyle);
     90                 paint->setMaskFilter(mf)->unref();
     91             }
     92         }
     93     }
     94 
     95     typedef GM INHERITED;
     96 };
     97 
     98 //////////////////////////////////////////////////////////////////////////////
     99 
    100 static skiagm::GM* MyFactory(void*) { return new DrawLooperGM; }
    101 static skiagm::GMRegistry reg(MyFactory);
    102