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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 "SkBlurMask.h"
     10 #include "SkBlurMaskFilter.h"
     11 #include "SkCanvas.h"
     12 #include "SkGraphics.h"
     13 #include "SkLayerDrawLooper.h"
     14 #include "SkRandom.h"
     15 
     16 #define WIDTH   200
     17 #define HEIGHT  200
     18 
     19 class DrawLooperGM : public skiagm::GM {
     20 public:
     21     DrawLooperGM() : fLooper(NULL) {
     22         this->setBGColor(0xFFDDDDDD);
     23     }
     24 
     25     virtual ~DrawLooperGM() {
     26         SkSafeUnref(fLooper);
     27     }
     28 
     29 protected:
     30     virtual SkISize onISize() {
     31         return SkISize::Make(520, 160);
     32     }
     33 
     34     virtual SkString onShortName() SK_OVERRIDE {
     35         return SkString("drawlooper");
     36     }
     37 
     38     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     39         this->init();
     40 
     41         SkPaint  paint;
     42         paint.setTextSize(SkIntToScalar(72));
     43         paint.setLooper(fLooper);
     44 
     45         canvas->drawCircle(SkIntToScalar(50), SkIntToScalar(50),
     46                            SkIntToScalar(30), paint);
     47 
     48         canvas->drawRectCoords(SkIntToScalar(150), SkIntToScalar(50),
     49                                SkIntToScalar(200), SkIntToScalar(100), paint);
     50 
     51         canvas->drawText("Looper", 6, SkIntToScalar(230), SkIntToScalar(100),
     52                          paint);
     53     }
     54 
     55 private:
     56     SkLayerDrawLooper*   fLooper;
     57 
     58     void init() {
     59         if (fLooper) return;
     60 
     61         static const struct {
     62             SkColor         fColor;
     63             SkPaint::Style  fStyle;
     64             SkScalar        fWidth;
     65             SkScalar        fOffset;
     66             SkScalar        fBlur;
     67         } gParams[] = {
     68             { SK_ColorWHITE, SkPaint::kStroke_Style, SkIntToScalar(1)*3/4, 0, 0 },
     69             { SK_ColorRED, SkPaint::kStroke_Style, SkIntToScalar(4), 0, 0 },
     70             { SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0 },
     71             { 0x88000000, SkPaint::kFill_Style, 0, SkIntToScalar(10), SkIntToScalar(3) }
     72         };
     73 
     74         fLooper = new SkLayerDrawLooper;
     75 
     76         SkLayerDrawLooper::LayerInfo info;
     77         info.fFlagsMask = SkPaint::kAntiAlias_Flag;
     78         info.fPaintBits = SkLayerDrawLooper::kStyle_Bit | SkLayerDrawLooper::kMaskFilter_Bit;
     79         info.fColorMode = SkXfermode::kSrc_Mode;
     80 
     81         for (size_t i = 0; i < SK_ARRAY_COUNT(gParams); i++) {
     82             info.fOffset.set(gParams[i].fOffset, gParams[i].fOffset);
     83             SkPaint* paint = fLooper->addLayer(info);
     84             paint->setAntiAlias(true);
     85             paint->setColor(gParams[i].fColor);
     86             paint->setStyle(gParams[i].fStyle);
     87             paint->setStrokeWidth(gParams[i].fWidth);
     88             if (gParams[i].fBlur > 0) {
     89                 SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
     90                                          SkBlurMask::ConvertRadiusToSigma(gParams[i].fBlur));
     91                 paint->setMaskFilter(mf)->unref();
     92             }
     93         }
     94     }
     95 
     96     typedef GM INHERITED;
     97 };
     98 
     99 //////////////////////////////////////////////////////////////////////////////
    100 
    101 static skiagm::GM* MyFactory(void*) { return new DrawLooperGM; }
    102 static skiagm::GMRegistry reg(MyFactory);
    103