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 "Sample.h" 8 #include "SkBitmap.h" 9 #include "SkCanvas.h" 10 #include "SkGradientShader.h" 11 #include "SkGraphics.h" 12 #include "SkPath.h" 13 #include "SkRandom.h" 14 #include "SkRegion.h" 15 #include "SkShader.h" 16 #include "SkUTF.h" 17 #include "SkColorPriv.h" 18 #include "SkColorFilter.h" 19 #include "SkTime.h" 20 #include "SkTypeface.h" 21 #include "SkVertices.h" 22 23 #include "SkOSFile.h" 24 #include "SkStream.h" 25 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 SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode); 38 } 39 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), SkShader::kMirror_TileMode); 46 } 47 48 class VerticesView : public Sample { 49 sk_sp<SkShader> fShader0; 50 sk_sp<SkShader> fShader1; 51 52 public: 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: 69 bool onQuery(Sample::Event* evt) override { 70 if (Sample::TitleQ(*evt)) { 71 Sample::TitleR(evt, "Vertices"); 72 return true; 73 } 74 return this->INHERITED::onQuery(evt); 75 } 76 77 SkScalar fScale; 78 79 void onDrawContent(SkCanvas* canvas) override { 80 SkPaint paint; 81 paint.setDither(true); 82 paint.setFilterQuality(kLow_SkFilterQuality); 83 84 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) { 85 auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount, 86 fRecs[i].fVerts, fRecs[i].fTexs, 87 nullptr); 88 canvas->save(); 89 90 paint.setShader(nullptr); 91 canvas->drawVertices(verts, SkBlendMode::kModulate, paint); 92 93 canvas->translate(SkIntToScalar(250), 0); 94 95 paint.setShader(fShader0); 96 canvas->drawVertices(verts, SkBlendMode::kModulate, paint); 97 98 canvas->translate(SkIntToScalar(250), 0); 99 100 paint.setShader(fShader1); 101 canvas->drawVertices(verts, SkBlendMode::kModulate, paint); 102 canvas->restore(); 103 104 canvas->translate(0, SkIntToScalar(250)); 105 } 106 } 107 108 Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override { 109 return new Click(this); 110 } 111 112 bool onClick(Click* click) override { 113 // fCurrX = click->fICurr.fX; 114 // fCurrY = click->fICurr.fY; 115 return true; 116 } 117 118 private: 119 struct Rec { 120 SkVertices::VertexMode fMode; 121 int fCount; 122 SkPoint* fVerts; 123 SkPoint* fTexs; 124 125 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {} 126 ~Rec() { delete[] fVerts; delete[] fTexs; } 127 }; 128 129 void make_tris(Rec* rec) { 130 int n = 10; 131 SkRandom rand; 132 133 rec->fMode = SkVertices::kTriangles_VertexMode; 134 rec->fCount = n * 3; 135 rec->fVerts = new SkPoint[rec->fCount]; 136 137 for (int i = 0; i < n; i++) { 138 SkPoint* v = &rec->fVerts[i*3]; 139 for (int j = 0; j < 3; j++) { 140 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250); 141 } 142 } 143 } 144 145 void make_fan(Rec* rec, int texWidth, int texHeight) { 146 const SkScalar tx = SkIntToScalar(texWidth); 147 const SkScalar ty = SkIntToScalar(texHeight); 148 const int n = 24; 149 150 rec->fMode = SkVertices::kTriangleFan_VertexMode; 151 rec->fCount = n + 2; 152 rec->fVerts = new SkPoint[rec->fCount]; 153 rec->fTexs = new SkPoint[rec->fCount]; 154 155 SkPoint* v = rec->fVerts; 156 SkPoint* t = rec->fTexs; 157 158 v[0].set(0, 0); 159 t[0].set(0, 0); 160 for (int i = 0; i < n; i++) { 161 SkScalar cos; 162 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 163 v[i+1].set(cos, sin); 164 t[i+1].set(i*tx/n, ty); 165 } 166 v[n+1] = v[1]; 167 t[n+1].set(tx, ty); 168 169 SkMatrix m; 170 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 171 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 172 m.mapPoints(v, rec->fCount); 173 } 174 175 void make_strip(Rec* rec, int texWidth, int texHeight) { 176 const SkScalar tx = SkIntToScalar(texWidth); 177 const SkScalar ty = SkIntToScalar(texHeight); 178 const int n = 24; 179 180 rec->fMode = SkVertices::kTriangleStrip_VertexMode; 181 rec->fCount = 2 * (n + 1); 182 rec->fVerts = new SkPoint[rec->fCount]; 183 rec->fTexs = new SkPoint[rec->fCount]; 184 185 SkPoint* v = rec->fVerts; 186 SkPoint* t = rec->fTexs; 187 188 for (int i = 0; i < n; i++) { 189 SkScalar cos; 190 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 191 v[i*2 + 0].set(cos/2, sin/2); 192 v[i*2 + 1].set(cos, sin); 193 194 t[i*2 + 0].set(tx * i / n, ty); 195 t[i*2 + 1].set(tx * i / n, 0); 196 } 197 v[2*n + 0] = v[0]; 198 v[2*n + 1] = v[1]; 199 200 t[2*n + 0].set(tx, ty); 201 t[2*n + 1].set(tx, 0); 202 203 SkMatrix m; 204 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 205 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 206 m.mapPoints(v, rec->fCount); 207 } 208 209 Rec fRecs[3]; 210 211 typedef Sample INHERITED; 212 }; 213 214 ////////////////////////////////////////////////////////////////////////////// 215 216 DEF_SAMPLE( return new VerticesView(); ) 217
