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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(nullptr) {
     22         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
     23     }
     24 
     25     virtual ~DrawLooperGM() {
     26         SkSafeUnref(fLooper);
     27     }
     28 
     29 protected:
     30     virtual SkISize onISize() override {
     31         return SkISize::Make(520, 160);
     32     }
     33 
     34     SkString onShortName() override {
     35         return SkString("drawlooper");
     36     }
     37 
     38     void onDraw(SkCanvas* canvas) override {
     39         this->init();
     40 
     41         SkPaint  paint;
     42         paint.setAntiAlias(true);
     43         sk_tool_utils::set_portable_typeface(&paint);
     44         paint.setTextSize(SkIntToScalar(72));
     45         paint.setLooper(fLooper);
     46 
     47         canvas->drawCircle(SkIntToScalar(50), SkIntToScalar(50),
     48                            SkIntToScalar(30), paint);
     49 
     50         canvas->drawRectCoords(SkIntToScalar(150), SkIntToScalar(50),
     51                                SkIntToScalar(200), SkIntToScalar(100), paint);
     52 
     53         canvas->drawText("Looper", 6, SkIntToScalar(230), SkIntToScalar(100),
     54                          paint);
     55     }
     56 
     57 private:
     58     SkLayerDrawLooper*   fLooper;
     59 
     60     void init() {
     61         if (fLooper) return;
     62 
     63         static const struct {
     64             SkColor         fColor;
     65             SkPaint::Style  fStyle;
     66             SkScalar        fWidth;
     67             SkScalar        fOffset;
     68             SkScalar        fBlur;
     69         } gParams[] = {
     70             { SK_ColorWHITE, SkPaint::kStroke_Style, SkIntToScalar(1)*3/4, 0, 0 },
     71             { SK_ColorRED, SkPaint::kStroke_Style, SkIntToScalar(4), 0, 0 },
     72             { SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0 },
     73             { 0x88000000, SkPaint::kFill_Style, 0, SkIntToScalar(10), SkIntToScalar(3) }
     74         };
     75 
     76         SkLayerDrawLooper::Builder looperBuilder;
     77 
     78         SkLayerDrawLooper::LayerInfo info;
     79         info.fPaintBits = SkLayerDrawLooper::kStyle_Bit | SkLayerDrawLooper::kMaskFilter_Bit;
     80         info.fColorMode = SkXfermode::kSrc_Mode;
     81 
     82         for (size_t i = 0; i < SK_ARRAY_COUNT(gParams); i++) {
     83             info.fOffset.set(gParams[i].fOffset, gParams[i].fOffset);
     84             SkPaint* paint = looperBuilder.addLayer(info);
     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(kNormal_SkBlurStyle,
     90                                          SkBlurMask::ConvertRadiusToSigma(gParams[i].fBlur));
     91                 paint->setMaskFilter(mf)->unref();
     92             }
     93         }
     94         fLooper = looperBuilder.detachLooper();
     95     }
     96 
     97     typedef GM INHERITED;
     98 };
     99 
    100 //////////////////////////////////////////////////////////////////////////////
    101 
    102 DEF_GM( return new DrawLooperGM; )
    103