1 /*
2 * Copyright 2011 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 #include "include/core/SkBitmap.h"
8 #include "include/core/SkCanvas.h"
9 #include "include/core/SkColorFilter.h"
10 #include "include/core/SkColorPriv.h"
11 #include "include/core/SkGraphics.h"
12 #include "include/core/SkPath.h"
13 #include "include/core/SkRegion.h"
14 #include "include/core/SkShader.h"
15 #include "include/core/SkTime.h"
16 #include "include/core/SkTypeface.h"
17 #include "include/core/SkVertices.h"
18 #include "include/effects/SkGradientShader.h"
19 #include "include/utils/SkRandom.h"
20 #include "samplecode/Sample.h"
21 #include "src/utils/SkUTF.h"
22
23 #include "include/core/SkStream.h"
24 #include "src/core/SkOSFile.h"
25
make_shader0(SkIPoint * size)26 static sk_sp<SkShader> make_shader0(SkIPoint* size) {
27 SkBitmap bm;
28 size->set(2, 2);
29 SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80);
30 SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff);
31 bm.allocN32Pixels(size->fX, size->fY);
32 bm.eraseColor(color0);
33 uint32_t* pixels = (uint32_t*) bm.getPixels();
34 pixels[0] = pixels[2] = color0;
35 pixels[1] = pixels[3] = color1;
36
37 return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat);
38 }
39
make_shader1(const SkIPoint & size)40 static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
41 SkPoint pts[] = { { 0, 0 },
42 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
43 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
44 return SkGradientShader::MakeLinear(pts, colors, nullptr,
45 SK_ARRAY_COUNT(colors), SkTileMode::kMirror);
46 }
47
48 class VerticesView : public Sample {
49 sk_sp<SkShader> fShader0;
50 sk_sp<SkShader> fShader1;
51
52 public:
VerticesView()53 VerticesView() {
54 SkIPoint size;
55
56 fShader0 = make_shader0(&size);
57 fShader1 = make_shader1(size);
58
59 make_strip(&fRecs[0], size.fX, size.fY);
60 make_fan(&fRecs[1], size.fX, size.fY);
61 make_tris(&fRecs[2]);
62
63 fScale = SK_Scalar1;
64
65 this->setBGColor(SK_ColorGRAY);
66 }
67
68 protected:
name()69 SkString name() override { return SkString("Vertices"); }
70
71 SkScalar fScale;
72
onDrawContent(SkCanvas * canvas)73 void onDrawContent(SkCanvas* canvas) override {
74 SkPaint paint;
75 paint.setDither(true);
76 paint.setFilterQuality(kLow_SkFilterQuality);
77
78 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
79 auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount,
80 fRecs[i].fVerts, fRecs[i].fTexs,
81 nullptr);
82 canvas->save();
83
84 paint.setShader(nullptr);
85 canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
86
87 canvas->translate(SkIntToScalar(250), 0);
88
89 paint.setShader(fShader0);
90 canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
91
92 canvas->translate(SkIntToScalar(250), 0);
93
94 paint.setShader(fShader1);
95 canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
96 canvas->restore();
97
98 canvas->translate(0, SkIntToScalar(250));
99 }
100 }
101
onFindClickHandler(SkScalar x,SkScalar y,ModifierKey)102 Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
103 return new Click();
104 }
105
onClick(Click * click)106 bool onClick(Click* click) override {
107 // fCurrX = click->fICurr.fX;
108 // fCurrY = click->fICurr.fY;
109 return true;
110 }
111
112 private:
113 struct Rec {
114 SkVertices::VertexMode fMode;
115 int fCount;
116 SkPoint* fVerts;
117 SkPoint* fTexs;
118
RecVerticesView::Rec119 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {}
~RecVerticesView::Rec120 ~Rec() { delete[] fVerts; delete[] fTexs; }
121 };
122
make_tris(Rec * rec)123 void make_tris(Rec* rec) {
124 int n = 10;
125 SkRandom rand;
126
127 rec->fMode = SkVertices::kTriangles_VertexMode;
128 rec->fCount = n * 3;
129 rec->fVerts = new SkPoint[rec->fCount];
130
131 for (int i = 0; i < n; i++) {
132 SkPoint* v = &rec->fVerts[i*3];
133 for (int j = 0; j < 3; j++) {
134 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250);
135 }
136 }
137 }
138
make_fan(Rec * rec,int texWidth,int texHeight)139 void make_fan(Rec* rec, int texWidth, int texHeight) {
140 const SkScalar tx = SkIntToScalar(texWidth);
141 const SkScalar ty = SkIntToScalar(texHeight);
142 const int n = 24;
143
144 rec->fMode = SkVertices::kTriangleFan_VertexMode;
145 rec->fCount = n + 2;
146 rec->fVerts = new SkPoint[rec->fCount];
147 rec->fTexs = new SkPoint[rec->fCount];
148
149 SkPoint* v = rec->fVerts;
150 SkPoint* t = rec->fTexs;
151
152 v[0].set(0, 0);
153 t[0].set(0, 0);
154 for (int i = 0; i < n; i++) {
155 SkScalar r = SK_ScalarPI * 2 * i / n,
156 sin = SkScalarSin(r),
157 cos = SkScalarCos(r);
158 v[i+1].set(cos, sin);
159 t[i+1].set(i*tx/n, ty);
160 }
161 v[n+1] = v[1];
162 t[n+1].set(tx, ty);
163
164 SkMatrix m;
165 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
166 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
167 m.mapPoints(v, rec->fCount);
168 }
169
make_strip(Rec * rec,int texWidth,int texHeight)170 void make_strip(Rec* rec, int texWidth, int texHeight) {
171 const SkScalar tx = SkIntToScalar(texWidth);
172 const SkScalar ty = SkIntToScalar(texHeight);
173 const int n = 24;
174
175 rec->fMode = SkVertices::kTriangleStrip_VertexMode;
176 rec->fCount = 2 * (n + 1);
177 rec->fVerts = new SkPoint[rec->fCount];
178 rec->fTexs = new SkPoint[rec->fCount];
179
180 SkPoint* v = rec->fVerts;
181 SkPoint* t = rec->fTexs;
182
183 for (int i = 0; i < n; i++) {
184 SkScalar r = SK_ScalarPI * 2 * i / n,
185 sin = SkScalarSin(r),
186 cos = SkScalarCos(r);
187 v[i*2 + 0].set(cos/2, sin/2);
188 v[i*2 + 1].set(cos, sin);
189
190 t[i*2 + 0].set(tx * i / n, ty);
191 t[i*2 + 1].set(tx * i / n, 0);
192 }
193 v[2*n + 0] = v[0];
194 v[2*n + 1] = v[1];
195
196 t[2*n + 0].set(tx, ty);
197 t[2*n + 1].set(tx, 0);
198
199 SkMatrix m;
200 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
201 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
202 m.mapPoints(v, rec->fCount);
203 }
204
205 Rec fRecs[3];
206
207 typedef Sample INHERITED;
208 };
209
210 //////////////////////////////////////////////////////////////////////////////
211
212 DEF_SAMPLE( return new VerticesView(); )
213