1 /*
2 * Copyright 2014 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
10 #include "SkPaint.h"
11 #include "SkPicture.h"
12 #include "SkPictureRecorder.h"
13 #include "SkShader.h"
14
15 constexpr SkScalar kPictureSize = SK_Scalar1;
16 constexpr SkScalar kFillSize = 100;
17 constexpr unsigned kRowSize = 6;
18
19 constexpr struct {
20 SkScalar x, y, w, h;
21 SkScalar offsetX, offsetY;
22 } tiles[] = {
23 { 0, 0, 1, 1, 0, 0 },
24 { -0.5f, -0.5f, 1, 1, 0, 0 },
25 { 0.5f, 0.5f, 1, 1, 0, 0 },
26
27 { 0, 0, 1.5f, 1.5f, 0, 0 },
28 { -0.5f, -0.5f, 1.5f, 1.5f, 0, 0 },
29 { 0.5f, 0.5f, 1.5f, 1.5f, 0, 0 },
30
31 { 0, 0, 0.5f, 0.5f, 0, 0 },
32 { 0.25f, 0.25f, 0.5f, 0.5f, 0, 0 },
33 { -0.25f, -0.25f, 0.5f, 0.5f, 0, 0 },
34
35 { 0, 0, 1, 1, 0.5f, 0.5f },
36 { -0.5f, -0.5f, 1, 1, 0.5f, 0.5f },
37 { 0.5f, 0.5f, 1, 1, 0.5f, 0.5f },
38
39 { 0, 0, 1.5f, 1.5f, 0.5f, 0.5f },
40 { -0.5f, -0.5f, 1.5f, 1.5f, 0.5f, 0.5f },
41 { 0.5f, 0.5f, 1.5f, 1.5f, 0.5f, 0.5f },
42
43 { 0, 0, 1.5f, 1, 0, 0 },
44 { -0.5f, -0.5f, 1.5f, 1, 0, 0 },
45 { 0.5f, 0.5f, 1.5f, 1, 0, 0 },
46
47 { 0, 0, 0.5f, 1, 0, 0 },
48 { 0.25f, 0.25f, 0.5f, 1, 0, 0 },
49 { -0.25f, -0.25f, 0.5f, 1, 0, 0 },
50
51 { 0, 0, 1, 1.5f, 0, 0 },
52 { -0.5f, -0.5f, 1, 1.5f, 0, 0 },
53 { 0.5f, 0.5f, 1, 1.5f, 0, 0 },
54
55 { 0, 0, 1, 0.5f, 0, 0 },
56 { 0.25f, 0.25f, 1, 0.5f, 0, 0 },
57 { -0.25f, -0.25f, 1, 0.5f, 0, 0 },
58 };
59
draw_scene(SkCanvas * canvas,SkScalar pictureSize)60 static void draw_scene(SkCanvas* canvas, SkScalar pictureSize) {
61 canvas->clear(SK_ColorWHITE);
62
63 SkPaint paint;
64 paint.setColor(SK_ColorGREEN);
65 paint.setStyle(SkPaint::kFill_Style);
66 paint.setAntiAlias(true);
67
68 canvas->drawCircle(pictureSize / 4, pictureSize / 4, pictureSize / 4, paint);
69 canvas->drawRect(SkRect::MakeXYWH(pictureSize / 2, pictureSize / 2,
70 pictureSize / 2, pictureSize / 2), paint);
71
72 paint.setColor(SK_ColorRED);
73 canvas->drawLine(pictureSize / 2, pictureSize * 1 / 3,
74 pictureSize / 2, pictureSize * 2 / 3, paint);
75 canvas->drawLine(pictureSize * 1 / 3, pictureSize / 2,
76 pictureSize * 2 / 3, pictureSize / 2, paint);
77
78 paint.setColor(SK_ColorBLACK);
79 paint.setStyle(SkPaint::kStroke_Style);
80 canvas->drawRect(SkRect::MakeWH(pictureSize, pictureSize), paint);
81 }
82
83 class PictureShaderTileGM : public skiagm::GM {
84 protected:
85
onShortName()86 SkString onShortName() override {
87 return SkString("pictureshadertile");
88 }
89
onISize()90 SkISize onISize() override {
91 return SkISize::Make(800, 600);
92 }
93
onOnceBeforeDraw()94 void onOnceBeforeDraw() override {
95 SkPictureRecorder recorder;
96 SkCanvas* pictureCanvas = recorder.beginRecording(kPictureSize, kPictureSize);
97 draw_scene(pictureCanvas, kPictureSize);
98 sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
99
100 SkPoint offset = SkPoint::Make(100, 100);
101 pictureCanvas = recorder.beginRecording(SkRect::MakeXYWH(offset.x(), offset.y(),
102 kPictureSize, kPictureSize));
103 pictureCanvas->translate(offset.x(), offset.y());
104 draw_scene(pictureCanvas, kPictureSize);
105 sk_sp<SkPicture> offsetPicture(recorder.finishRecordingAsPicture());
106
107 for (unsigned i = 0; i < SK_ARRAY_COUNT(tiles); ++i) {
108 SkRect tile = SkRect::MakeXYWH(tiles[i].x * kPictureSize,
109 tiles[i].y * kPictureSize,
110 tiles[i].w * kPictureSize,
111 tiles[i].h * kPictureSize);
112 SkMatrix localMatrix;
113 localMatrix.setTranslate(tiles[i].offsetX * kPictureSize,
114 tiles[i].offsetY * kPictureSize);
115 localMatrix.postScale(kFillSize / (2 * kPictureSize),
116 kFillSize / (2 * kPictureSize));
117
118 sk_sp<SkPicture> pictureRef = picture;
119 SkRect* tilePtr = &tile;
120
121 if (tile == SkRect::MakeWH(kPictureSize, kPictureSize)) {
122 // When the tile == picture bounds, exercise the picture + offset path.
123 pictureRef = offsetPicture;
124 tilePtr = nullptr;
125 }
126
127 fShaders[i] = SkShader::MakePictureShader(pictureRef, SkShader::kRepeat_TileMode,
128 SkShader::kRepeat_TileMode, &localMatrix,
129 tilePtr);
130 }
131 }
132
onDraw(SkCanvas * canvas)133 void onDraw(SkCanvas* canvas) override {
134 canvas->clear(SK_ColorBLACK);
135
136 SkPaint paint;
137 paint.setStyle(SkPaint::kFill_Style);
138
139 for (unsigned i = 0; i < SK_ARRAY_COUNT(fShaders); ++i) {
140 paint.setShader(fShaders[i]);
141
142 canvas->save();
143 canvas->translate((i % kRowSize) * kFillSize * 1.1f,
144 (i / kRowSize) * kFillSize * 1.1f);
145 canvas->drawRect(SkRect::MakeWH(kFillSize, kFillSize), paint);
146 canvas->restore();
147 }
148 }
149
150 private:
151 sk_sp<SkShader> fShaders[SK_ARRAY_COUNT(tiles)];
152
153 typedef GM INHERITED;
154 };
155
156 DEF_GM(return new PictureShaderTileGM;)
157