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      1 /*
      2 * Copyright 2016 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 
     10 #include "SkAvoidXfermode.h"
     11 
     12 // This GM exercises how the avoid xfer mode interacts with partial coverage
     13 class AvoidXfermode3GM : public skiagm::GM {
     14 public:
     15     AvoidXfermode3GM() { }
     16 
     17 protected:
     18     SkString onShortName() override {
     19         return SkString("avoidxfermode3");
     20     }
     21 
     22     SkISize onISize() override { return SkISize::Make(128, 128); }
     23 
     24     void onDraw(SkCanvas* canvas) override {
     25         canvas->drawARGB(255, 0, 0, 0);
     26 
     27         SkRect r = SkRect::MakeXYWH(16.5f, 16.5f, 96.0f, 96.0f);
     28 
     29         SkPaint p0;
     30         p0.setColor(SK_ColorWHITE);
     31         p0.setAntiAlias(true);
     32 
     33         canvas->drawRect(r, p0);
     34 
     35         r = SkRect::MakeXYWH(3.5f, 3.5f, 59.0f, 59.0f);
     36 
     37         // UL corner: replace white with green with a tight tolerance
     38         SkPaint p1;
     39         p1.setColor(SK_ColorGREEN);
     40         p1.setAntiAlias(true);
     41         p1.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE,
     42                                                5,
     43                                                SkAvoidXfermode::kTargetColor_Mode))->unref();
     44 
     45         canvas->drawRect(r, p1);
     46 
     47         r.offsetTo(65.5f, 3.5f);
     48 
     49         // UR corner: draw red everywhere except white with a tight tolerance
     50         SkPaint p2;
     51         p2.setColor(SK_ColorRED);
     52         p2.setAntiAlias(true);
     53         p2.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE,
     54                                                250,
     55                                                SkAvoidXfermode::kAvoidColor_Mode))->unref();
     56 
     57         canvas->drawRect(r, p2);
     58 
     59         r.offsetTo(3.5f, 65.5f);
     60 
     61         // LL corner: replace white with blue with a loose tolerance
     62         SkPaint p3;
     63         p3.setColor(SK_ColorBLUE);
     64         p3.setAntiAlias(true);
     65         p3.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE,
     66                                                250,
     67                                                SkAvoidXfermode::kTargetColor_Mode))->unref();
     68 
     69         canvas->drawRect(r, p3);
     70 
     71         r.offsetTo(65.5f, 65.5f);
     72 
     73         // LR corner: draw yellow everywhere except white with a loose tolerance
     74         SkPaint p4;
     75         p4.setColor(SK_ColorYELLOW);
     76         p4.setAntiAlias(true);
     77         p4.setXfermode(SkAvoidXfermode::Create(SK_ColorWHITE,
     78                                                5,
     79                                                SkAvoidXfermode::kAvoidColor_Mode))->unref();
     80 
     81         canvas->drawRect(r, p4);
     82     }
     83 
     84 private:
     85     typedef GM INHERITED;
     86 };
     87 
     88 //////////////////////////////////////////////////////////////////////////////
     89 
     90 DEF_GM(return new AvoidXfermode3GM;)
     91