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1 /*
2  * Copyright 2013 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 "SkBitmap.h"
10 #include "SkCanvas.h"
11 #include "SkColor.h"
12 #include "SkShader.h"
13 
14 namespace skiagm {
15 
16 // This GM draws a 3x3 grid (with the center element excluded) of rectangles
17 // filled with a bitmap shader. The bitmap shader is transformed so that the
18 // pattern cell is at the center (excluded) region.
19 //
20 // In Repeat and Mirror mode, this tests that the bitmap shader still draws
21 // even though the pattern cell is outside the clip.
22 //
23 // In Clamp mode, this tests that the clamp is handled properly. For PDF,
24 // (and possibly other exported formats) this also "tests" that the image itself
25 // is not stored (well, you'll need to open it up with an external tool to
26 // verify that).
27 
create_bitmap()28 static SkBitmap create_bitmap() {
29     SkBitmap bmp;
30     bmp.allocN32Pixels(2, 2);
31     uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
32     pixels[0] = SkPreMultiplyColor(SK_ColorRED);
33     pixels[1] = SkPreMultiplyColor(SK_ColorGREEN);
34     pixels[2] = SkPreMultiplyColor(SK_ColorBLACK);
35     pixels[3] = SkPreMultiplyColor(SK_ColorBLUE);
36 
37     return bmp;
38 }
39 
40 constexpr SkScalar RECT_SIZE = 64;
41 constexpr SkScalar SLIDE_SIZE = 300;
42 
43 class ClippedBitmapShadersGM : public GM {
44 public:
ClippedBitmapShadersGM(SkShader::TileMode mode,bool hq=false)45     ClippedBitmapShadersGM(SkShader::TileMode mode, bool hq=false)
46     : fMode(mode), fHQ(hq) {
47     }
48 
49 protected:
50     SkShader::TileMode fMode;
51     bool fHQ;
52 
onShortName()53     virtual SkString onShortName() {
54         SkString descriptor;
55         switch (fMode) {
56             case SkShader::kRepeat_TileMode:
57                 descriptor = "tile";
58             break;
59             case SkShader::kMirror_TileMode:
60                 descriptor = "mirror";
61             break;
62             case SkShader::kClamp_TileMode:
63                 descriptor = "clamp";
64             break;
65             default:
66                 SkASSERT(false);
67         }
68         descriptor.prepend("clipped-bitmap-shaders-");
69         if (fHQ) {
70             descriptor.append("-hq");
71         }
72         return descriptor;
73     }
74 
onISize()75     virtual SkISize onISize() {
76         return SkISize::Make(300, 300);
77     }
78 
onDraw(SkCanvas * canvas)79     virtual void onDraw(SkCanvas* canvas) {
80         SkBitmap bmp = create_bitmap();
81         SkMatrix s;
82         s.reset();
83         s.setScale(8, 8);
84         s.postTranslate(SLIDE_SIZE / 2, SLIDE_SIZE / 2);
85         SkPaint paint;
86         paint.setShader(SkShader::MakeBitmapShader(bmp, fMode, fMode, &s));
87 
88         if (fHQ) {
89             paint.setFilterQuality(kHigh_SkFilterQuality);
90         }
91 
92         SkScalar margin = (SLIDE_SIZE / 3 - RECT_SIZE) / 2;
93         for (int i = 0; i < 3; i++) {
94             SkScalar yOrigin = SLIDE_SIZE / 3 * i + margin;
95             for (int j = 0; j < 3; j++) {
96                 SkScalar xOrigin = SLIDE_SIZE / 3 * j + margin;
97                 if (i == 1 && j == 1) {
98                     continue;   // skip center element
99                 }
100                 SkRect rect = SkRect::MakeXYWH(xOrigin, yOrigin,
101                                                RECT_SIZE, RECT_SIZE);
102                 canvas->save();
103                 canvas->clipRect(rect);
104                 canvas->drawRect(rect, paint);
105                 canvas->restore();
106             }
107         }
108     }
109 
110 private:
111     typedef GM INHERITED;
112 };
113 
114 //////////////////////////////////////////////////////////////////////////////
115 
116 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode); )
117 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode); )
118 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode); )
119 
120 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode, true); )
121 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode, true); )
122 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode, true); )
123 
124 
125 }
126