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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkMatrix.h"
13 #include "include/core/SkPaint.h"
14 #include "include/core/SkRect.h"
15 #include "include/core/SkScalar.h"
16 #include "include/core/SkShader.h"
17 #include "include/core/SkSize.h"
18 #include "include/core/SkString.h"
19 #include "include/core/SkTileMode.h"
20 #include "include/core/SkTypes.h"
21
22 namespace {
23
24 // This GM draws a 3x3 grid (with the center element excluded) of rectangles
25 // filled with a bitmap shader. The bitmap shader is transformed so that the
26 // pattern cell is at the center (excluded) region.
27 //
28 // In Repeat and Mirror mode, this tests that the bitmap shader still draws
29 // even though the pattern cell is outside the clip.
30 //
31 // In Clamp mode, this tests that the clamp is handled properly. For PDF,
32 // (and possibly other exported formats) this also "tests" that the image itself
33 // is not stored (well, you'll need to open it up with an external tool to
34 // verify that).
35
create_bitmap()36 static SkBitmap create_bitmap() {
37 SkBitmap bmp;
38 bmp.allocN32Pixels(2, 2);
39 uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
40 pixels[0] = SkPreMultiplyColor(SK_ColorRED);
41 pixels[1] = SkPreMultiplyColor(SK_ColorGREEN);
42 pixels[2] = SkPreMultiplyColor(SK_ColorBLACK);
43 pixels[3] = SkPreMultiplyColor(SK_ColorBLUE);
44
45 return bmp;
46 }
47
48 constexpr SkScalar RECT_SIZE = 64;
49 constexpr SkScalar SLIDE_SIZE = 300;
50
51 class ClippedBitmapShadersGM : public skiagm::GM {
52 public:
ClippedBitmapShadersGM(SkTileMode mode,bool hq=false)53 ClippedBitmapShadersGM(SkTileMode mode, bool hq=false)
54 : fMode(mode), fHQ(hq) {
55 }
56
57 protected:
58 SkTileMode fMode;
59 bool fHQ;
60
onShortName()61 SkString onShortName() override {
62 SkString descriptor;
63 switch (fMode) {
64 case SkTileMode::kRepeat:
65 descriptor = "tile";
66 break;
67 case SkTileMode::kMirror:
68 descriptor = "mirror";
69 break;
70 case SkTileMode::kClamp:
71 descriptor = "clamp";
72 break;
73 case SkTileMode::kDecal:
74 descriptor = "decal";
75 break;
76 }
77 descriptor.prepend("clipped-bitmap-shaders-");
78 if (fHQ) {
79 descriptor.append("-hq");
80 }
81 return descriptor;
82 }
83
onISize()84 SkISize onISize() override { return {300, 300}; }
85
onDraw(SkCanvas * canvas)86 void onDraw(SkCanvas* canvas) override {
87 SkBitmap bmp = create_bitmap();
88 SkMatrix s;
89 s.reset();
90 s.setScale(8, 8);
91 s.postTranslate(SLIDE_SIZE / 2, SLIDE_SIZE / 2);
92 SkPaint paint;
93 paint.setShader(bmp.makeShader(fMode, fMode,
94 fHQ ? SkSamplingOptions(SkCubicResampler::Mitchell())
95 : SkSamplingOptions(),
96 s));
97
98 SkScalar margin = (SLIDE_SIZE / 3 - RECT_SIZE) / 2;
99 for (int i = 0; i < 3; i++) {
100 SkScalar yOrigin = SLIDE_SIZE / 3 * i + margin;
101 for (int j = 0; j < 3; j++) {
102 SkScalar xOrigin = SLIDE_SIZE / 3 * j + margin;
103 if (i == 1 && j == 1) {
104 continue; // skip center element
105 }
106 SkRect rect = SkRect::MakeXYWH(xOrigin, yOrigin,
107 RECT_SIZE, RECT_SIZE);
108 canvas->save();
109 canvas->clipRect(rect);
110 canvas->drawRect(rect, paint);
111 canvas->restore();
112 }
113 }
114 }
115
116 private:
117 using INHERITED = GM;
118 };
119 } // namespace
120
121 DEF_GM( return new ClippedBitmapShadersGM(SkTileMode::kRepeat); )
122 DEF_GM( return new ClippedBitmapShadersGM(SkTileMode::kMirror); )
123 DEF_GM( return new ClippedBitmapShadersGM(SkTileMode::kClamp); )
124
125 DEF_GM( return new ClippedBitmapShadersGM(SkTileMode::kRepeat, true); )
126 DEF_GM( return new ClippedBitmapShadersGM(SkTileMode::kMirror, true); )
127 DEF_GM( return new ClippedBitmapShadersGM(SkTileMode::kClamp, true); )
128