src/third_party/skia/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 "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.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 static skiagm::GM* MyFactory(void*) { return new DrawLooperGM; }
 103 static skiagm::GMRegistry reg(MyFactory);