1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "SampleCode.h" 9 #include "SkView.h" 10 #include "SkCanvas.h" 11 #include "SkGradientShader.h" 12 #include "SkGraphics.h" 13 #include "SkImageDecoder.h" 14 #include "SkPath.h" 15 #include "SkRandom.h" 16 #include "SkRegion.h" 17 #include "SkShader.h" 18 #include "SkUtils.h" 19 #include "SkXfermode.h" 20 #include "SkColorPriv.h" 21 #include "SkColorFilter.h" 22 #include "SkTime.h" 23 #include "SkTypeface.h" 24 25 #include "SkOSFile.h" 26 #include "SkStream.h" 27 28 #include "SkGeometry.h" // private include :( 29 30 static SkShader* make_shader0(SkIPoint* size) { 31 SkBitmap bm; 32 33 // SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm); 34 SkImageDecoder::DecodeFile("/skimages/logo.png", &bm); 35 size->set(bm.width(), bm.height()); 36 return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode, 37 SkShader::kClamp_TileMode); 38 } 39 40 static 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::CreateLinear(pts, colors, NULL, 45 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode); 46 } 47 48 /////////////////////////////////////////////////////////////////////////////// 49 50 class Patch { 51 public: 52 Patch() { sk_bzero(fPts, sizeof(fPts)); } 53 ~Patch() {} 54 55 void setPatch(const SkPoint pts[12]) { 56 memcpy(fPts, pts, 12 * sizeof(SkPoint)); 57 fPts[12] = pts[0]; // the last shall be first 58 } 59 void setBounds(int w, int h) { fW = w; fH = h; } 60 61 void draw(SkCanvas*, const SkPaint&, int segsU, int segsV, 62 bool doTextures, bool doColors); 63 64 private: 65 SkPoint fPts[13]; 66 int fW, fH; 67 }; 68 69 static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) { 70 SkScalar t = 0; 71 SkScalar dt = SK_Scalar1 / segs; 72 73 samples[0] = cubic[0]; 74 for (int i = 1; i < segs; i++) { 75 t += dt; 76 SkEvalCubicAt(cubic, t, &samples[i], NULL, NULL); 77 } 78 } 79 80 static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv, 81 SkPoint* pt) { 82 const int TL = 0; 83 const int TR = nu; 84 const int BR = TR + nv; 85 const int BL = BR + nu; 86 87 SkScalar u = SkIntToScalar(iu) / nu; 88 SkScalar v = SkIntToScalar(iv) / nv; 89 90 SkScalar uv = SkScalarMul(u, v); 91 SkScalar Uv = SkScalarMul(SK_Scalar1 - u, v); 92 SkScalar uV = SkScalarMul(u, SK_Scalar1 - v); 93 SkScalar UV = SkScalarMul(SK_Scalar1 - u, SK_Scalar1 - v); 94 95 SkScalar x0 = SkScalarMul(UV, edge[TL].fX) + SkScalarMul(uV, edge[TR].fX) + 96 SkScalarMul(Uv, edge[BL].fX) + SkScalarMul(uv, edge[BR].fX); 97 SkScalar y0 = SkScalarMul(UV, edge[TL].fY) + SkScalarMul(uV, edge[TR].fY) + 98 SkScalarMul(Uv, edge[BL].fY) + SkScalarMul(uv, edge[BR].fY); 99 100 SkScalar x = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fX) + 101 SkScalarMul(u, edge[TR+iv].fX) + 102 SkScalarMul(v, edge[BR+nu-iu].fX) + 103 SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fX) - x0; 104 SkScalar y = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fY) + 105 SkScalarMul(u, edge[TR+iv].fY) + 106 SkScalarMul(v, edge[BR+nu-iu].fY) + 107 SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fY) - y0; 108 pt->set(x, y); 109 } 110 111 static int ScalarTo255(SkScalar v) { 112 int scale = SkScalarToFixed(v) >> 8; 113 if (scale < 0) { 114 scale = 0; 115 } else if (scale > 255) { 116 scale = 255; 117 } 118 return scale; 119 } 120 121 static SkColor make_color(SkScalar s, SkScalar t) { 122 int cs = ScalarTo255(s); 123 int ct = ScalarTo255(t); 124 return SkColorSetARGB(0xFF, cs, 0, 0) + SkColorSetARGB(0, 0, ct, 0); 125 } 126 127 void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, 128 bool doTextures, bool doColors) { 129 if (nu < 1 || nv < 1) { 130 return; 131 } 132 133 int i, npts = (nu + nv) * 2; 134 SkAutoSTMalloc<16, SkPoint> storage(npts + 1); 135 SkPoint* edge0 = storage.get(); 136 SkPoint* edge1 = edge0 + nu; 137 SkPoint* edge2 = edge1 + nv; 138 SkPoint* edge3 = edge2 + nu; 139 140 // evaluate the edge points 141 eval_patch_edge(fPts + 0, edge0, nu); 142 eval_patch_edge(fPts + 3, edge1, nv); 143 eval_patch_edge(fPts + 6, edge2, nu); 144 eval_patch_edge(fPts + 9, edge3, nv); 145 edge3[nv] = edge0[0]; // the last shall be first 146 147 for (i = 0; i < npts; i++) { 148 // canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint); 149 } 150 151 int row, vertCount = (nu + 1) * (nv + 1); 152 SkAutoTMalloc<SkPoint> vertStorage(vertCount); 153 SkPoint* verts = vertStorage.get(); 154 155 // first row 156 memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint)); 157 // rows 158 SkPoint* r = verts; 159 for (row = 1; row < nv; row++) { 160 r += nu + 1; 161 r[0] = edge3[nv - row]; 162 for (int col = 1; col < nu; col++) { 163 eval_sheet(edge0, nu, nv, col, row, &r[col]); 164 } 165 r[nu] = edge1[row]; 166 } 167 // last row 168 SkPoint* last = verts + nv * (nu + 1); 169 for (i = 0; i <= nu; i++) { 170 last[i] = edge2[nu - i]; 171 } 172 173 // canvas->drawPoints(verts, vertCount, paint); 174 175 int stripCount = (nu + 1) * 2; 176 SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2); 177 SkAutoTMalloc<SkColor> colorStorage(stripCount); 178 SkPoint* strip = stripStorage.get(); 179 SkPoint* tex = strip + stripCount; 180 SkColor* colors = colorStorage.get(); 181 SkScalar t = 0; 182 const SkScalar ds = SK_Scalar1 * fW / nu; 183 const SkScalar dt = SK_Scalar1 * fH / nv; 184 r = verts; 185 for (row = 0; row < nv; row++) { 186 SkPoint* upper = r; 187 SkPoint* lower = r + nu + 1; 188 r = lower; 189 SkScalar s = 0; 190 for (i = 0; i <= nu; i++) { 191 strip[i*2 + 0] = *upper++; 192 strip[i*2 + 1] = *lower++; 193 tex[i*2 + 0].set(s, t); 194 tex[i*2 + 1].set(s, t + dt); 195 colors[i*2 + 0] = make_color(s/fW, t/fH); 196 colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH); 197 s += ds; 198 } 199 t += dt; 200 canvas->drawVertices(SkCanvas::kTriangleStrip_VertexMode, stripCount, 201 strip, doTextures ? tex : NULL, 202 doColors ? colors : NULL, NULL, 203 NULL, 0, paint); 204 } 205 } 206 207 static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, 208 Patch* patch) { 209 210 SkAutoCanvasRestore ar(canvas, true); 211 212 patch->draw(canvas, paint, 10, 10, false, false); 213 canvas->translate(SkIntToScalar(180), 0); 214 patch->draw(canvas, paint, 10, 10, true, false); 215 canvas->translate(SkIntToScalar(180), 0); 216 patch->draw(canvas, paint, 10, 10, false, true); 217 canvas->translate(SkIntToScalar(180), 0); 218 patch->draw(canvas, paint, 10, 10, true, true); 219 } 220 221 class PatchView : public SampleView { 222 SkShader* fShader0; 223 SkShader* fShader1; 224 SkIPoint fSize0, fSize1; 225 SkPoint fPts[12]; 226 227 public: 228 PatchView() { 229 fShader0 = make_shader0(&fSize0); 230 fSize1 = fSize0; 231 if (fSize0.fX == 0 || fSize0.fY == 0) { 232 fSize1.set(2, 2); 233 } 234 fShader1 = make_shader1(fSize1); 235 236 const SkScalar S = SkIntToScalar(50); 237 const SkScalar T = SkIntToScalar(40); 238 fPts[0].set(S*0, T); 239 fPts[1].set(S*1, T); 240 fPts[2].set(S*2, T); 241 fPts[3].set(S*3, T); 242 fPts[4].set(S*3, T*2); 243 fPts[5].set(S*3, T*3); 244 fPts[6].set(S*3, T*4); 245 fPts[7].set(S*2, T*4); 246 fPts[8].set(S*1, T*4); 247 fPts[9].set(S*0, T*4); 248 fPts[10].set(S*0, T*3); 249 fPts[11].set(S*0, T*2); 250 251 this->setBGColor(SK_ColorGRAY); 252 } 253 254 virtual ~PatchView() { 255 SkSafeUnref(fShader0); 256 SkSafeUnref(fShader1); 257 } 258 259 protected: 260 // overrides from SkEventSink 261 virtual bool onQuery(SkEvent* evt) { 262 if (SampleCode::TitleQ(*evt)) { 263 SampleCode::TitleR(evt, "Patch"); 264 return true; 265 } 266 return this->INHERITED::onQuery(evt); 267 } 268 269 virtual void onDrawContent(SkCanvas* canvas) { 270 SkPaint paint; 271 paint.setDither(true); 272 paint.setFilterLevel(SkPaint::kLow_FilterLevel); 273 274 canvas->translate(SkIntToScalar(20), 0); 275 276 Patch patch; 277 278 paint.setShader(fShader0); 279 if (fSize0.fX == 0) { 280 fSize0.fX = 1; 281 } 282 if (fSize0.fY == 0) { 283 fSize0.fY = 1; 284 } 285 patch.setBounds(fSize0.fX, fSize0.fY); 286 287 patch.setPatch(fPts); 288 drawpatches(canvas, paint, 10, 10, &patch); 289 290 paint.setShader(NULL); 291 paint.setAntiAlias(true); 292 paint.setStrokeWidth(SkIntToScalar(5)); 293 canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint); 294 295 canvas->translate(0, SkIntToScalar(300)); 296 297 paint.setAntiAlias(false); 298 paint.setShader(fShader1); 299 { 300 SkMatrix m; 301 m.setSkew(1, 0); 302 SkShader* s = SkShader::CreateLocalMatrixShader(paint.getShader(), m); 303 paint.setShader(s)->unref(); 304 } 305 { 306 static int gAngle; 307 SkMatrix m; 308 m.setRotate(SkIntToScalar(gAngle++)); 309 SkShader* s = SkShader::CreateLocalMatrixShader(paint.getShader(), m); 310 paint.setShader(s)->unref(); 311 } 312 patch.setBounds(fSize1.fX, fSize1.fY); 313 drawpatches(canvas, paint, 10, 10, &patch); 314 315 this->inval(NULL); 316 } 317 318 class PtClick : public Click { 319 public: 320 int fIndex; 321 PtClick(SkView* view, int index) : Click(view), fIndex(index) {} 322 }; 323 324 static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) { 325 return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5); 326 } 327 328 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, 329 unsigned modi) SK_OVERRIDE { 330 for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) { 331 if (hittest(fPts[i], x, y)) { 332 return new PtClick(this, (int)i); 333 } 334 } 335 return this->INHERITED::onFindClickHandler(x, y, modi); 336 } 337 338 virtual bool onClick(Click* click) { 339 fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX, click->fCurr.fY); 340 this->inval(NULL); 341 return true; 342 } 343 344 private: 345 typedef SampleView INHERITED; 346 }; 347 348 ////////////////////////////////////////////////////////////////////////////// 349 350 static SkView* MyFactory() { return new PatchView; } 351 static SkViewRegister reg(MyFactory); 352
