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/DecodeUtils.h"
24 #include "tools/Resources.h"
25
make_shader()26 static sk_sp<SkShader> make_shader() {
27 const SkColor colors[] = {
28 SK_ColorRED, SK_ColorCYAN, SK_ColorGREEN, SK_ColorWHITE, SK_ColorMAGENTA, SK_ColorBLUE,
29 SK_ColorYELLOW,
30 };
31 const SkPoint pts[] = { { 100.f / 4.f, 0.f }, { 3.f * 100.f / 4.f, 100.f } };
32
33 return SkGradientShader::MakeLinear(pts, colors, nullptr, std::size(colors),
34 SkTileMode::kMirror);
35 }
36
draw_control_points(SkCanvas * canvas,const SkPoint cubics[12])37 static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) {
38 //draw control points
39 SkPaint paint;
40 SkPoint bottom[SkPatchUtils::kNumPtsCubic];
41 SkPatchUtils::GetBottomCubic(cubics, bottom);
42 SkPoint top[SkPatchUtils::kNumPtsCubic];
43 SkPatchUtils::GetTopCubic(cubics, top);
44 SkPoint left[SkPatchUtils::kNumPtsCubic];
45 SkPatchUtils::GetLeftCubic(cubics, left);
46 SkPoint right[SkPatchUtils::kNumPtsCubic];
47 SkPatchUtils::GetRightCubic(cubics, right);
48
49 paint.setColor(SK_ColorBLACK);
50 paint.setStrokeWidth(0.5f);
51 SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
52 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
53 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom + 1, paint);
54 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
55 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
56 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
57
58 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top + 1, paint);
59 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left + 1, paint);
60 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right + 1, paint);
61
62 paint.setStrokeWidth(2);
63
64 paint.setColor(SK_ColorRED);
65 canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
66
67 paint.setColor(SK_ColorBLUE);
68 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom + 1, paint);
69
70 paint.setColor(SK_ColorCYAN);
71 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top + 1, paint);
72
73 paint.setColor(SK_ColorYELLOW);
74 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left + 1, paint);
75
76 paint.setColor(SK_ColorGREEN);
77 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right + 1, paint);
78 }
79
80 // The order of the colors and points is clockwise starting at upper-left corner.
81 const SkPoint gCubics[SkPatchUtils::kNumCtrlPts] = {
82 //top points
83 {100,100},{150,50},{250,150}, {300,100},
84 //right points
85 {250, 150},{350,250},
86 //bottom points
87 {300,300},{250,250},{150,350},{100,300},
88 //left points
89 {50,250},{150,150}
90 };
91
92 const SkPoint gTexCoords[SkPatchUtils::kNumCorners] = {
93 {0.0f, 0.0f}, {100.0f, 0.0f}, {100.0f,100.0f}, {0.0f, 100.0f}
94 };
95
96
dopatch(SkCanvas * canvas,const SkColor colors[],sk_sp<SkImage> img,const SkMatrix * localMatrix)97 static void dopatch(SkCanvas* canvas, const SkColor colors[], sk_sp<SkImage> img,
98 const SkMatrix* localMatrix) {
99 SkPaint paint;
100 paint.setColor(SK_ColorGREEN);
101
102 const SkBlendMode modes[] = {
103 SkBlendMode::kSrc,
104 SkBlendMode::kDst,
105 SkBlendMode::kColorDodge,
106 };
107
108 SkPoint texStorage[4];
109 const SkPoint* tex = gTexCoords;
110
111 sk_sp<SkShader> shader;
112 if (img) {
113 SkScalar w = img->width();
114 SkScalar h = img->height();
115 shader = img->makeShader(SkSamplingOptions(), localMatrix);
116 texStorage[0].set(0, 0);
117 texStorage[1].set(w, 0);
118 texStorage[2].set(w, h);
119 texStorage[3].set(0, h);
120 tex = texStorage;
121 } else {
122 shader = make_shader();
123 }
124
125 canvas->save();
126 for (int y = 0; y < 3; y++) {
127 for (int x = 0; x < 4; x++) {
128 canvas->save();
129 canvas->translate(x * 350.0f, y * 350.0f);
130 switch (x) {
131 case 0:
132 canvas->drawPatch(gCubics, nullptr, nullptr, modes[y], paint);
133 break;
134 case 1:
135 canvas->drawPatch(gCubics, colors, nullptr, modes[y], paint);
136 break;
137 case 2:
138 paint.setShader(shader);
139 canvas->drawPatch(gCubics, nullptr, tex, modes[y], paint);
140 paint.setShader(nullptr);
141 break;
142 case 3:
143 paint.setShader(shader);
144 canvas->drawPatch(gCubics, colors, tex, modes[y], paint);
145 paint.setShader(nullptr);
146 break;
147 default:
148 break;
149 }
150
151 draw_control_points(canvas, gCubics);
152 canvas->restore();
153 }
154 }
155 canvas->restore();
156 }
157
158 DEF_SIMPLE_GM(patch_primitive, canvas, 1500, 1100) {
159 const SkColor colors[SkPatchUtils::kNumCorners] = {
160 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
161 };
162 dopatch(canvas, colors, nullptr, nullptr);
163 }
164 DEF_SIMPLE_GM(patch_image, canvas, 1500, 1100) {
165 const SkColor colors[SkPatchUtils::kNumCorners] = {
166 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
167 };
168 dopatch(canvas, colors, ToolUtils::GetResourceAsImage("images/mandrill_128.png"), nullptr);
169 }
170 DEF_SIMPLE_GM(patch_image_persp, canvas, 1500, 1100) {
171 const SkColor colors[SkPatchUtils::kNumCorners] = {
172 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
173 };
174 SkMatrix localM;
175 localM.reset();
176 localM[6] = 0.00001f; // force perspective
177 dopatch(canvas, colors, ToolUtils::GetResourceAsImage("images/mandrill_128.png"), &localM);
178 }
179 DEF_SIMPLE_GM(patch_alpha, canvas, 1500, 1100) {
180 const SkColor colors[SkPatchUtils::kNumCorners] = {
181 SK_ColorRED, 0x0000FF00, SK_ColorBLUE, 0x00FF00FF,
182 };
183 dopatch(canvas, colors, nullptr, nullptr);
184 }
185
186 // These two should look the same (one patch, one simple path)
187 DEF_SIMPLE_GM(patch_alpha_test, canvas, 550, 250) {
188 canvas->translate(-75, -75);
189
190 const SkColor colors[SkPatchUtils::kNumCorners] = {
191 0x80FF0000, 0x80FF0000, 0x80FF0000, 0x80FF0000,
192 };
193 SkPaint paint;
194 canvas->drawPatch(gCubics, colors, nullptr, SkBlendMode::kDst, paint);
195
196 canvas->translate(300, 0);
197
198 SkPath path;
199 path.moveTo(gCubics[0]);
200 path.cubicTo(gCubics[ 1], gCubics[ 2], gCubics[ 3]);
201 path.cubicTo(gCubics[ 4], gCubics[ 5], gCubics[ 6]);
202 path.cubicTo(gCubics[ 7], gCubics[ 8], gCubics[ 9]);
203 path.cubicTo(gCubics[10], gCubics[11], gCubics[ 0]);
204 paint.setColor(colors[0]);
205 canvas->drawPath(path, paint);
206 }
207
208
