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/gm.h"
9 #include "include/core/SkBlendMode.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkImage.h"
13 #include "include/core/SkPaint.h"
14 #include "include/core/SkPath.h"
15 #include "include/core/SkPoint.h"
16 #include "include/core/SkRefCnt.h"
17 #include "include/core/SkScalar.h"
18 #include "include/core/SkShader.h"
19 #include "include/core/SkTileMode.h"
20 #include "include/core/SkTypes.h"
21 #include "include/effects/SkGradientShader.h"
22 #include "src/utils/SkPatchUtils.h"
23 #include "tools/Resources.h"
24
make_shader()25 static sk_sp<SkShader> make_shader() {
26 const SkColor colors[] = {
27 SK_ColorRED, SK_ColorCYAN, SK_ColorGREEN, SK_ColorWHITE, SK_ColorMAGENTA, SK_ColorBLUE,
28 SK_ColorYELLOW,
29 };
30 const SkPoint pts[] = { { 100.f / 4.f, 0.f }, { 3.f * 100.f / 4.f, 100.f } };
31
32 return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
33 SkTileMode::kMirror);
34 }
35
draw_control_points(SkCanvas * canvas,const SkPoint cubics[12])36 static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) {
37 //draw control points
38 SkPaint paint;
39 SkPoint bottom[SkPatchUtils::kNumPtsCubic];
40 SkPatchUtils::GetBottomCubic(cubics, bottom);
41 SkPoint top[SkPatchUtils::kNumPtsCubic];
42 SkPatchUtils::GetTopCubic(cubics, top);
43 SkPoint left[SkPatchUtils::kNumPtsCubic];
44 SkPatchUtils::GetLeftCubic(cubics, left);
45 SkPoint right[SkPatchUtils::kNumPtsCubic];
46 SkPatchUtils::GetRightCubic(cubics, right);
47
48 paint.setColor(SK_ColorBLACK);
49 paint.setStrokeWidth(0.5f);
50 SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
51 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
52 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom + 1, paint);
53 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
54 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
55 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
56
57 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top + 1, paint);
58 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left + 1, paint);
59 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right + 1, paint);
60
61 paint.setStrokeWidth(2);
62
63 paint.setColor(SK_ColorRED);
64 canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
65
66 paint.setColor(SK_ColorBLUE);
67 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom + 1, paint);
68
69 paint.setColor(SK_ColorCYAN);
70 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top + 1, paint);
71
72 paint.setColor(SK_ColorYELLOW);
73 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left + 1, paint);
74
75 paint.setColor(SK_ColorGREEN);
76 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right + 1, paint);
77 }
78
79 // The order of the colors and points is clockwise starting at upper-left corner.
80 const SkPoint gCubics[SkPatchUtils::kNumCtrlPts] = {
81 //top points
82 {100,100},{150,50},{250,150}, {300,100},
83 //right points
84 {250, 150},{350,250},
85 //bottom points
86 {300,300},{250,250},{150,350},{100,300},
87 //left points
88 {50,250},{150,150}
89 };
90
91 const SkPoint gTexCoords[SkPatchUtils::kNumCorners] = {
92 {0.0f, 0.0f}, {100.0f, 0.0f}, {100.0f,100.0f}, {0.0f, 100.0f}
93 };
94
95
dopatch(SkCanvas * canvas,const SkColor colors[],sk_sp<SkImage> img=nullptr)96 static void dopatch(SkCanvas* canvas, const SkColor colors[], sk_sp<SkImage> img = nullptr) {
97 SkPaint paint;
98
99 const SkBlendMode modes[] = {
100 SkBlendMode::kSrc,
101 SkBlendMode::kDst,
102 SkBlendMode::kModulate,
103 };
104
105 SkPoint texStorage[4];
106 const SkPoint* tex = gTexCoords;
107
108 sk_sp<SkShader> shader;
109 if (img) {
110 SkScalar w = img->width();
111 SkScalar h = img->height();
112 shader = img->makeShader();
113 texStorage[0].set(0, 0);
114 texStorage[1].set(w, 0);
115 texStorage[2].set(w, h);
116 texStorage[3].set(0, h);
117 tex = texStorage;
118 } else {
119 shader = make_shader();
120 }
121
122 canvas->save();
123 for (int y = 0; y < 3; y++) {
124 for (int x = 0; x < 4; x++) {
125 canvas->save();
126 canvas->translate(x * 350.0f, y * 350.0f);
127 switch (x) {
128 case 0:
129 canvas->drawPatch(gCubics, nullptr, nullptr, modes[y], paint);
130 break;
131 case 1:
132 canvas->drawPatch(gCubics, colors, nullptr, modes[y], paint);
133 break;
134 case 2:
135 paint.setShader(shader);
136 canvas->drawPatch(gCubics, nullptr, tex, modes[y], paint);
137 paint.setShader(nullptr);
138 break;
139 case 3:
140 paint.setShader(shader);
141 canvas->drawPatch(gCubics, colors, tex, modes[y], paint);
142 paint.setShader(nullptr);
143 break;
144 default:
145 break;
146 }
147
148 draw_control_points(canvas, gCubics);
149 canvas->restore();
150 }
151 }
152 canvas->restore();
153 }
154
155 DEF_SIMPLE_GM(patch_primitive, canvas, 1500, 1100) {
156 const SkColor colors[SkPatchUtils::kNumCorners] = {
157 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
158 };
159 dopatch(canvas, colors);
160 }
161 DEF_SIMPLE_GM(patch_image, canvas, 1500, 1100) {
162 const SkColor colors[SkPatchUtils::kNumCorners] = {
163 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
164 };
165 dopatch(canvas, colors, GetResourceAsImage("images/mandrill_128.png"));
166 }
167 DEF_SIMPLE_GM(patch_alpha, canvas, 1500, 1100) {
168 const SkColor colors[SkPatchUtils::kNumCorners] = {
169 SK_ColorRED, 0x0000FF00, SK_ColorBLUE, 0x00FF00FF,
170 };
171 dopatch(canvas, colors);
172 }
173
174 // These two should look the same (one patch, one simple path)
175 DEF_SIMPLE_GM(patch_alpha_test, canvas, 550, 250) {
176 canvas->translate(-75, -75);
177
178 const SkColor colors[SkPatchUtils::kNumCorners] = {
179 0x80FF0000, 0x80FF0000, 0x80FF0000, 0x80FF0000,
180 };
181 SkPaint paint;
182 canvas->drawPatch(gCubics, colors, nullptr, SkBlendMode::kModulate, paint);
183
184 canvas->translate(300, 0);
185
186 SkPath path;
187 path.moveTo(gCubics[0]);
188 path.cubicTo(gCubics[ 1], gCubics[ 2], gCubics[ 3]);
189 path.cubicTo(gCubics[ 4], gCubics[ 5], gCubics[ 6]);
190 path.cubicTo(gCubics[ 7], gCubics[ 8], gCubics[ 9]);
191 path.cubicTo(gCubics[10], gCubics[11], gCubics[ 0]);
192 paint.setColor(colors[0]);
193 canvas->drawPath(path, paint);
194 }
195
196
