gm/drawlooper.cpp

   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 "sk_tool_utils.h"
  10 #include "SkBlurMask.h"
  11 #include "SkBlurMaskFilter.h"
  12 #include "SkCanvas.h"
  13 #include "SkGraphics.h"
  14 #include "SkLayerDrawLooper.h"
  15 #include "SkRandom.h"
  16
  17 #define WIDTH   200
  18 #define HEIGHT  200
  19
  20 class DrawLooperGM : public skiagm::GM {
  21 public:
  22     DrawLooperGM() : fLooper(nullptr) {
  23         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
  24     }
  25
  26 protected:
  27     virtual SkISize onISize() override {
  28         return SkISize::Make(520, 160);
  29     }
  30
  31     SkString onShortName() override {
  32         return SkString("drawlooper");
  33     }
  34
  35     void onDraw(SkCanvas* canvas) override {
  36         this->init();
  37
  38         SkPaint  paint;
  39         paint.setAntiAlias(true);
  40         sk_tool_utils::set_portable_typeface(&paint);
  41         paint.setTextSize(SkIntToScalar(72));
  42         paint.setLooper(fLooper);
  43
  44         canvas->drawCircle(50, 50, 30, paint);
  45         canvas->drawRect({ 150, 50, 200, 100 }, paint);
  46         canvas->drawString("Looper", 230, 100, paint);
  47     }
  48
  49 private:
  50     sk_sp<SkDrawLooper> fLooper;
  51
  52     void init() {
  53         if (fLooper) return;
  54
  55         constexpr struct {
  56             SkColor         fColor;
  57             SkPaint::Style  fStyle;
  58             SkScalar        fWidth;
  59             SkScalar        fOffset;
  60             SkScalar        fBlur;
  61         } gParams[] = {
  62             { SK_ColorWHITE, SkPaint::kStroke_Style, SkIntToScalar(1)*3/4, 0, 0 },
  63             { SK_ColorRED, SkPaint::kStroke_Style, SkIntToScalar(4), 0, 0 },
  64             { SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0 },
  65             { 0x88000000, SkPaint::kFill_Style, 0, SkIntToScalar(10), SkIntToScalar(3) }
  66         };
  67
  68         SkLayerDrawLooper::Builder looperBuilder;
  69
  70         SkLayerDrawLooper::LayerInfo info;
  71         info.fPaintBits = SkLayerDrawLooper::kStyle_Bit | SkLayerDrawLooper::kMaskFilter_Bit;
  72         info.fColorMode = SkBlendMode::kSrc;
  73
  74         for (size_t i = 0; i < SK_ARRAY_COUNT(gParams); i++) {
  75             info.fOffset.set(gParams[i].fOffset, gParams[i].fOffset);
  76             SkPaint* paint = looperBuilder.addLayer(info);
  77             paint->setColor(gParams[i].fColor);
  78             paint->setStyle(gParams[i].fStyle);
  79             paint->setStrokeWidth(gParams[i].fWidth);
  80             if (gParams[i].fBlur > 0) {
  81                 paint->setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
  82                                          SkBlurMask::ConvertRadiusToSigma(gParams[i].fBlur)));
  83             }
  84         }
  85         fLooper = looperBuilder.detach();
  86     }
  87
  88     typedef GM INHERITED;
  89 };
  90
  91 //////////////////////////////////////////////////////////////////////////////
  92
  93 DEF_GM( return new DrawLooperGM; )