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 "SkBlurDrawLooper.h"
11 #include "SkBlurMask.h"
12 #include "SkColorFilter.h"
13 #include "SkMaskFilter.h"
14 #include "SkPath.h"
15 
16 namespace skiagm {
17 
18 ///////////////////////////////////////////////////////////////////////////////
19 
20 static void setup(SkPaint* paint, SkColor c, SkScalar strokeWidth) {
21     paint->setColor(c);
22     if (strokeWidth < 0) {
23         paint->setStyle(SkPaint::kFill_Style);
24     } else {
25         paint->setStyle(SkPaint::kStroke_Style);
26         paint->setStrokeWidth(strokeWidth);
27     }
28 }
29 
30 class ShadowsGM : public GM {
31 public:
32     SkPath fCirclePath;
33     SkRect fRect;
34     SkBitmap fBitmap;
35 
36 protected:
37     void onOnceBeforeDraw() override {
38         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
39         fCirclePath.addCircle(SkIntToScalar(20), SkIntToScalar(20), SkIntToScalar(10) );
40         fRect.set(SkIntToScalar(10), SkIntToScalar(10),
41                   SkIntToScalar(30), SkIntToScalar(30));
42         fBitmap.allocPixels(SkImageInfo::Make(20, 20, SkColorType::kAlpha_8_SkColorType,
43                             kPremul_SkAlphaType));
44         SkCanvas canvas(fBitmap);
45         canvas.clear(0x0);
46         SkPaint p;
47         canvas.drawRect(SkRect::MakeXYWH(10, 0, 10, 10), p);
48         canvas.drawRect(SkRect::MakeXYWH(0, 10, 10, 10), p);
49     }
50 
51     SkString onShortName() override {
52         return SkString("shadows");
53     }
54 
55     SkISize onISize() override {
56         return SkISize::Make(200, 200);
57     }
58 
59     void onDraw(SkCanvas* canvas) override {
60         sk_sp<SkDrawLooper> shadowLoopers[] = {
61               SkBlurDrawLooper::Make(SK_ColorBLUE,
62                                      SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(10)),
63                                      SkIntToScalar(5), SkIntToScalar(10)),
64               SkBlurDrawLooper::Make(SK_ColorBLUE,
65                                      SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(10)),
66                                      SkIntToScalar(5), SkIntToScalar(10)),
67               SkBlurDrawLooper::Make(SK_ColorBLACK,
68                                      SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
69                                      SkIntToScalar(5),
70                                      SkIntToScalar(10)),
71               SkBlurDrawLooper::Make(0x7FFF0000,
72                                      SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
73                                      SkIntToScalar(-5), SkIntToScalar(-10)),
74             SkBlurDrawLooper::Make(SK_ColorBLACK, SkIntToScalar(0),
75                                      SkIntToScalar(5), SkIntToScalar(5)),
76         };
77 
78         constexpr struct {
79             SkColor fColor;
80             SkScalar fStrokeWidth;
81         } gRec[] = {
82             { SK_ColorRED,      -SK_Scalar1 },
83             { SK_ColorGREEN,    SkIntToScalar(4) },
84             { SK_ColorBLUE,     SkIntToScalar(0)},
85         };
86 
87         SkPaint paint;
88         paint.setAntiAlias(true);
89         for (size_t i = 0; i < SK_ARRAY_COUNT(shadowLoopers); ++i) {
90             SkAutoCanvasRestore acr(canvas, true);
91 
92             paint.setLooper(shadowLoopers[i]);
93 
94             canvas->translate(SkIntToScalar((unsigned int)i*40), SkIntToScalar(0));
95             setup(&paint, gRec[0].fColor, gRec[0].fStrokeWidth);
96             canvas->drawRect(fRect, paint);
97 
98             canvas->translate(SkIntToScalar(0), SkIntToScalar(40));
99             setup(&paint, gRec[1].fColor, gRec[1].fStrokeWidth);
100             canvas->drawPath(fCirclePath, paint);
101 
102             canvas->translate(SkIntToScalar(0), SkIntToScalar(40));
103             setup(&paint, gRec[2].fColor, gRec[2].fStrokeWidth);
104             canvas->drawPath(fCirclePath, paint);
105 
106             // see bug.skia.org/562 (reference, draws correct)
107             canvas->translate(0, 40);
108             paint.setColor(SK_ColorBLACK);
109             canvas->drawBitmap(fBitmap, 10, 10, &paint);
110 
111             canvas->translate(0, 40);
112             paint.setShader(SkShader::MakeBitmapShader(
113                                           fBitmap, SkShader::kRepeat_TileMode,
114                                           SkShader::kRepeat_TileMode));
115 
116             // see bug.skia.org/562 (shows bug as reported)
117             paint.setStyle(SkPaint::kFill_Style);
118             canvas->drawRect(SkRect::MakeXYWH(10, 10, 20, 20), paint);
119             paint.setShader(nullptr);
120         }
121     }
122 
123 private:
124     typedef GM INHERITED;
125 };
126 
127 ///////////////////////////////////////////////////////////////////////////////
128 
129 static GM* MyFactory(void*) { return new ShadowsGM; }
130 static GMRegistry reg(MyFactory);
131 
132 }
133