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 "SampleCode.h" 8 #include "SkView.h" 9 #include "SkBitmap.h" 10 #include "SkCanvas.h" 11 #include "SkGradientShader.h" 12 #include "SkGraphics.h" 13 #include "SkPath.h" 14 #include "SkRandom.h" 15 #include "SkRegion.h" 16 #include "SkShader.h" 17 #include "SkUtils.h" 18 #include "SkColorPriv.h" 19 #include "SkColorFilter.h" 20 #include "SkTime.h" 21 #include "SkTypeface.h" 22 #include "SkVertices.h" 23 24 #include "SkOSFile.h" 25 #include "SkStream.h" 26 27 static sk_sp<SkShader> make_shader0(SkIPoint* size) { 28 SkBitmap bm; 29 size->set(2, 2); 30 SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80); 31 SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff); 32 bm.allocN32Pixels(size->fX, size->fY); 33 bm.eraseColor(color0); 34 uint32_t* pixels = (uint32_t*) bm.getPixels(); 35 pixels[0] = pixels[2] = color0; 36 pixels[1] = pixels[3] = color1; 37 38 return SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode); 39 } 40 41 static sk_sp<SkShader> make_shader1(const SkIPoint& size) { 42 SkPoint pts[] = { { 0, 0 }, 43 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } }; 44 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED }; 45 return SkGradientShader::MakeLinear(pts, colors, nullptr, 46 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode); 47 } 48 49 class VerticesView : public SampleView { 50 sk_sp<SkShader> fShader0; 51 sk_sp<SkShader> fShader1; 52 53 public: 54 VerticesView() { 55 SkIPoint size; 56 57 fShader0 = make_shader0(&size); 58 fShader1 = make_shader1(size); 59 60 make_strip(&fRecs[0], size.fX, size.fY); 61 make_fan(&fRecs[1], size.fX, size.fY); 62 make_tris(&fRecs[2]); 63 64 fScale = SK_Scalar1; 65 66 this->setBGColor(SK_ColorGRAY); 67 } 68 69 protected: 70 // overrides from SkEventSink 71 bool onQuery(SkEvent* evt) override { 72 if (SampleCode::TitleQ(*evt)) { 73 SampleCode::TitleR(evt, "Vertices"); 74 return true; 75 } 76 return this->INHERITED::onQuery(evt); 77 } 78 79 SkScalar fScale; 80 81 void onDrawContent(SkCanvas* canvas) override { 82 SkPaint paint; 83 paint.setDither(true); 84 paint.setFilterQuality(kLow_SkFilterQuality); 85 86 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) { 87 auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount, 88 fRecs[i].fVerts, fRecs[i].fTexs, 89 nullptr); 90 canvas->save(); 91 92 paint.setShader(nullptr); 93 canvas->drawVertices(verts, SkBlendMode::kModulate, paint); 94 95 canvas->translate(SkIntToScalar(250), 0); 96 97 paint.setShader(fShader0); 98 canvas->drawVertices(verts, SkBlendMode::kModulate, paint); 99 100 canvas->translate(SkIntToScalar(250), 0); 101 102 paint.setShader(fShader1); 103 canvas->drawVertices(verts, SkBlendMode::kModulate, paint); 104 canvas->restore(); 105 106 canvas->translate(0, SkIntToScalar(250)); 107 } 108 } 109 110 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override { 111 return new Click(this); 112 } 113 114 bool onClick(Click* click) override { 115 // fCurrX = click->fICurr.fX; 116 // fCurrY = click->fICurr.fY; 117 return true; 118 } 119 120 private: 121 struct Rec { 122 SkVertices::VertexMode fMode; 123 int fCount; 124 SkPoint* fVerts; 125 SkPoint* fTexs; 126 127 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {} 128 ~Rec() { delete[] fVerts; delete[] fTexs; } 129 }; 130 131 void make_tris(Rec* rec) { 132 int n = 10; 133 SkRandom rand; 134 135 rec->fMode = SkVertices::kTriangles_VertexMode; 136 rec->fCount = n * 3; 137 rec->fVerts = new SkPoint[rec->fCount]; 138 139 for (int i = 0; i < n; i++) { 140 SkPoint* v = &rec->fVerts[i*3]; 141 for (int j = 0; j < 3; j++) { 142 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250); 143 } 144 } 145 } 146 147 void make_fan(Rec* rec, int texWidth, int texHeight) { 148 const SkScalar tx = SkIntToScalar(texWidth); 149 const SkScalar ty = SkIntToScalar(texHeight); 150 const int n = 24; 151 152 rec->fMode = SkVertices::kTriangleFan_VertexMode; 153 rec->fCount = n + 2; 154 rec->fVerts = new SkPoint[rec->fCount]; 155 rec->fTexs = new SkPoint[rec->fCount]; 156 157 SkPoint* v = rec->fVerts; 158 SkPoint* t = rec->fTexs; 159 160 v[0].set(0, 0); 161 t[0].set(0, 0); 162 for (int i = 0; i < n; i++) { 163 SkScalar cos; 164 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 165 v[i+1].set(cos, sin); 166 t[i+1].set(i*tx/n, ty); 167 } 168 v[n+1] = v[1]; 169 t[n+1].set(tx, ty); 170 171 SkMatrix m; 172 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 173 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 174 m.mapPoints(v, rec->fCount); 175 } 176 177 void make_strip(Rec* rec, int texWidth, int texHeight) { 178 const SkScalar tx = SkIntToScalar(texWidth); 179 const SkScalar ty = SkIntToScalar(texHeight); 180 const int n = 24; 181 182 rec->fMode = SkVertices::kTriangleStrip_VertexMode; 183 rec->fCount = 2 * (n + 1); 184 rec->fVerts = new SkPoint[rec->fCount]; 185 rec->fTexs = new SkPoint[rec->fCount]; 186 187 SkPoint* v = rec->fVerts; 188 SkPoint* t = rec->fTexs; 189 190 for (int i = 0; i < n; i++) { 191 SkScalar cos; 192 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 193 v[i*2 + 0].set(cos/2, sin/2); 194 v[i*2 + 1].set(cos, sin); 195 196 t[i*2 + 0].set(tx * i / n, ty); 197 t[i*2 + 1].set(tx * i / n, 0); 198 } 199 v[2*n + 0] = v[0]; 200 v[2*n + 1] = v[1]; 201 202 t[2*n + 0].set(tx, ty); 203 t[2*n + 1].set(tx, 0); 204 205 SkMatrix m; 206 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 207 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 208 m.mapPoints(v, rec->fCount); 209 } 210 211 Rec fRecs[3]; 212 213 typedef SampleView INHERITED; 214 }; 215 216 ////////////////////////////////////////////////////////////////////////////// 217 218 static SkView* MyFactory() { return new VerticesView; } 219 static SkViewRegister reg(MyFactory); 220
