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