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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 "SkCanvas.h"
10 #include "SkColorPriv.h"
11 #include "SkShader.h"
12 
13 /*
14  *  Want to ensure that our bitmap sampler (in bitmap shader) keeps plenty of
15  *  precision when scaling very large images (where the dx might get very small.
16  */
17 
18 #define W   257
19 #define H   161
20 
21 class GiantBitmapGM : public skiagm::GM {
22     SkBitmap* fBM;
23     SkShader::TileMode fMode;
24     bool fDoFilter;
25     bool fDoRotate;
26 
getBitmap()27     const SkBitmap& getBitmap() {
28         if (nullptr == fBM) {
29             fBM = new SkBitmap;
30             fBM->allocN32Pixels(W, H);
31             fBM->eraseColor(SK_ColorWHITE);
32 
33             const SkColor colors[] = {
34                 SK_ColorBLUE, SK_ColorRED, SK_ColorBLACK, SK_ColorGREEN
35             };
36 
37             SkCanvas canvas(*fBM);
38             SkPaint paint;
39             paint.setAntiAlias(true);
40             paint.setStrokeWidth(SkIntToScalar(20));
41 
42 #if 0
43             for (int y = -H*2; y < H; y += 50) {
44                 SkScalar yy = SkIntToScalar(y);
45                 paint.setColor(colors[y/50 & 0x3]);
46                 canvas.drawLine(0, yy, SkIntToScalar(W), yy + SkIntToScalar(W),
47                                 paint);
48             }
49 #else
50             for (int x = -W; x < W; x += 60) {
51                 paint.setColor(colors[x/60 & 0x3]);
52 
53                 SkScalar xx = SkIntToScalar(x);
54                 canvas.drawLine(xx, 0, xx, SkIntToScalar(H),
55                                 paint);
56             }
57 #endif
58         }
59         return *fBM;
60     }
61 
62 public:
GiantBitmapGM(SkShader::TileMode mode,bool doFilter,bool doRotate)63     GiantBitmapGM(SkShader::TileMode mode, bool doFilter, bool doRotate) : fBM(nullptr) {
64         fMode = mode;
65         fDoFilter = doFilter;
66         fDoRotate = doRotate;
67     }
68 
~GiantBitmapGM()69     virtual ~GiantBitmapGM() { delete fBM; }
70 
71 protected:
72 
onShortName()73     SkString onShortName() override {
74         SkString str("giantbitmap_");
75         switch (fMode) {
76             case SkShader::kClamp_TileMode:
77                 str.append("clamp");
78                 break;
79             case SkShader::kRepeat_TileMode:
80                 str.append("repeat");
81                 break;
82             case SkShader::kMirror_TileMode:
83                 str.append("mirror");
84                 break;
85             default:
86                 break;
87         }
88         str.append(fDoFilter ? "_bilerp" : "_point");
89         str.append(fDoRotate ? "_rotate" : "_scale");
90         return str;
91     }
92 
onISize()93     SkISize onISize() override { return SkISize::Make(640, 480); }
94 
onDraw(SkCanvas * canvas)95     void onDraw(SkCanvas* canvas) override {
96         SkPaint paint;
97 
98         SkMatrix m;
99         if (fDoRotate) {
100 //            m.setRotate(SkIntToScalar(30), 0, 0);
101             m.setSkew(SK_Scalar1, 0, 0, 0);
102 //            m.postScale(2*SK_Scalar1/3, 2*SK_Scalar1/3);
103         } else {
104             SkScalar scale = 11*SK_Scalar1/12;
105             m.setScale(scale, scale);
106         }
107         SkShader* s = SkShader::CreateBitmapShader(getBitmap(), fMode, fMode, &m);
108 
109         paint.setShader(s)->unref();
110         paint.setFilterQuality(fDoFilter ? kLow_SkFilterQuality : kNone_SkFilterQuality);
111 
112         canvas->translate(SkIntToScalar(50), SkIntToScalar(50));
113 
114 //        SkRect r = SkRect::MakeXYWH(-50, -50, 32, 16);
115 //        canvas->drawRect(r, paint); return;
116         canvas->drawPaint(paint);
117     }
118 
119 private:
120     typedef GM INHERITED;
121 };
122 
123 ///////////////////////////////////////////////////////////////////////////////
124 
125 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, false, false); )
126 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, false); )
127 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, false, false); )
128 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, true, false); )
129 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, false); )
130 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, true, false); )
131 
132 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, false, true); )
133 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, true); )
134 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, false, true); )
135 DEF_GM( return new GiantBitmapGM(SkShader::kClamp_TileMode, true, true); )
136 DEF_GM( return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, true); )
137 DEF_GM( return new GiantBitmapGM(SkShader::kMirror_TileMode, true, true); )
138