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 8#include "SampleCode.h" 9#include "SkAnimTimer.h" 10#include "SkView.h" 11#include "SkCanvas.h" 12#include "SkGradientShader.h" 13#include "SkGraphics.h" 14#include "SkImageDecoder.h" 15#include "SkPath.h" 16#include "SkRandom.h" 17#include "SkRegion.h" 18#include "SkShader.h" 19#include "SkUtils.h" 20#include "SkXfermode.h" 21#include "SkColorPriv.h" 22#include "SkColorFilter.h" 23#include "SkTime.h" 24#include "SkTypeface.h" 25 26#include "SkOSFile.h" 27#include "SkStream.h" 28 29#include "SkGeometry.h" // private include :( 30 31static SkShader* make_shader0(SkIPoint* size) { 32 SkBitmap bm; 33 34// SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm); 35 SkImageDecoder::DecodeFile("/skimages/logo.png", &bm); 36 size->set(bm.width(), bm.height()); 37 return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode, 38 SkShader::kClamp_TileMode); 39} 40 41static 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::CreateLinear(pts, colors, nullptr, 46 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode); 47} 48 49/////////////////////////////////////////////////////////////////////////////// 50 51class Patch { 52public: 53 Patch() { sk_bzero(fPts, sizeof(fPts)); } 54 ~Patch() {} 55 56 void setPatch(const SkPoint pts[12]) { 57 memcpy(fPts, pts, 12 * sizeof(SkPoint)); 58 fPts[12] = pts[0]; // the last shall be first 59 } 60 void setBounds(int w, int h) { fW = w; fH = h; } 61 62 void draw(SkCanvas*, const SkPaint&, int segsU, int segsV, 63 bool doTextures, bool doColors); 64 65private: 66 SkPoint fPts[13]; 67 int fW, fH; 68}; 69 70static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) { 71 SkScalar t = 0; 72 SkScalar dt = SK_Scalar1 / segs; 73 74 samples[0] = cubic[0]; 75 for (int i = 1; i < segs; i++) { 76 t += dt; 77 SkEvalCubicAt(cubic, t, &samples[i], nullptr, nullptr); 78 } 79} 80 81static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv, 82 SkPoint* pt) { 83 const int TL = 0; 84 const int TR = nu; 85 const int BR = TR + nv; 86 const int BL = BR + nu; 87 88 SkScalar u = SkIntToScalar(iu) / nu; 89 SkScalar v = SkIntToScalar(iv) / nv; 90 91 SkScalar uv = SkScalarMul(u, v); 92 SkScalar Uv = SkScalarMul(SK_Scalar1 - u, v); 93 SkScalar uV = SkScalarMul(u, SK_Scalar1 - v); 94 SkScalar UV = SkScalarMul(SK_Scalar1 - u, SK_Scalar1 - v); 95 96 SkScalar x0 = SkScalarMul(UV, edge[TL].fX) + SkScalarMul(uV, edge[TR].fX) + 97 SkScalarMul(Uv, edge[BL].fX) + SkScalarMul(uv, edge[BR].fX); 98 SkScalar y0 = SkScalarMul(UV, edge[TL].fY) + SkScalarMul(uV, edge[TR].fY) + 99 SkScalarMul(Uv, edge[BL].fY) + SkScalarMul(uv, edge[BR].fY); 100 101 SkScalar x = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fX) + 102 SkScalarMul(u, edge[TR+iv].fX) + 103 SkScalarMul(v, edge[BR+nu-iu].fX) + 104 SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fX) - x0; 105 SkScalar y = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fY) + 106 SkScalarMul(u, edge[TR+iv].fY) + 107 SkScalarMul(v, edge[BR+nu-iu].fY) + 108 SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fY) - y0; 109 pt->set(x, y); 110} 111 112static int ScalarTo255(SkScalar v) { 113 int scale = SkScalarToFixed(v) >> 8; 114 if (scale < 0) { 115 scale = 0; 116 } else if (scale > 255) { 117 scale = 255; 118 } 119 return scale; 120} 121 122static SkColor make_color(SkScalar s, SkScalar t) { 123 int cs = ScalarTo255(s); 124 int ct = ScalarTo255(t); 125 return SkColorSetARGB(0xFF, cs, 0, 0) + SkColorSetARGB(0, 0, ct, 0); 126} 127 128void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, 129 bool doTextures, bool doColors) { 130 if (nu < 1 || nv < 1) { 131 return; 132 } 133 134 int i, npts = (nu + nv) * 2; 135 SkAutoSTMalloc<16, SkPoint> storage(npts + 1); 136 SkPoint* edge0 = storage.get(); 137 SkPoint* edge1 = edge0 + nu; 138 SkPoint* edge2 = edge1 + nv; 139 SkPoint* edge3 = edge2 + nu; 140 141 // evaluate the edge points 142 eval_patch_edge(fPts + 0, edge0, nu); 143 eval_patch_edge(fPts + 3, edge1, nv); 144 eval_patch_edge(fPts + 6, edge2, nu); 145 eval_patch_edge(fPts + 9, edge3, nv); 146 edge3[nv] = edge0[0]; // the last shall be first 147 148 for (i = 0; i < npts; i++) { 149// canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint); 150 } 151 152 int row, vertCount = (nu + 1) * (nv + 1); 153 SkAutoTMalloc<SkPoint> vertStorage(vertCount); 154 SkPoint* verts = vertStorage.get(); 155 156 // first row 157 memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint)); 158 // rows 159 SkPoint* r = verts; 160 for (row = 1; row < nv; row++) { 161 r += nu + 1; 162 r[0] = edge3[nv - row]; 163 for (int col = 1; col < nu; col++) { 164 eval_sheet(edge0, nu, nv, col, row, &r[col]); 165 } 166 r[nu] = edge1[row]; 167 } 168 // last row 169 SkPoint* last = verts + nv * (nu + 1); 170 for (i = 0; i <= nu; i++) { 171 last[i] = edge2[nu - i]; 172 } 173 174// canvas->drawPoints(verts, vertCount, paint); 175 176 int stripCount = (nu + 1) * 2; 177 SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2); 178 SkAutoTMalloc<SkColor> colorStorage(stripCount); 179 SkPoint* strip = stripStorage.get(); 180 SkPoint* tex = strip + stripCount; 181 SkColor* colors = colorStorage.get(); 182 SkScalar t = 0; 183 const SkScalar ds = SK_Scalar1 * fW / nu; 184 const SkScalar dt = SK_Scalar1 * fH / nv; 185 r = verts; 186 for (row = 0; row < nv; row++) { 187 SkPoint* upper = r; 188 SkPoint* lower = r + nu + 1; 189 r = lower; 190 SkScalar s = 0; 191 for (i = 0; i <= nu; i++) { 192 strip[i*2 + 0] = *upper++; 193 strip[i*2 + 1] = *lower++; 194 tex[i*2 + 0].set(s, t); 195 tex[i*2 + 1].set(s, t + dt); 196 colors[i*2 + 0] = make_color(s/fW, t/fH); 197 colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH); 198 s += ds; 199 } 200 t += dt; 201 canvas->drawVertices(SkCanvas::kTriangleStrip_VertexMode, stripCount, 202 strip, doTextures ? tex : nullptr, 203 doColors ? colors : nullptr, nullptr, 204 nullptr, 0, paint); 205 } 206} 207 208static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, 209 Patch* patch) { 210 SkAutoCanvasRestore ar(canvas, true); 211 212 patch->draw(canvas, paint, nu, nv, false, false); 213 canvas->translate(SkIntToScalar(180), 0); 214 patch->draw(canvas, paint, nu, nv, true, false); 215 canvas->translate(SkIntToScalar(180), 0); 216 patch->draw(canvas, paint, nu, nv, false, true); 217 canvas->translate(SkIntToScalar(180), 0); 218 patch->draw(canvas, paint, nu, nv, true, true); 219} 220 221const SkScalar DX = 20; 222const SkScalar DY = 0; 223 224class PatchView : public SampleView { 225 SkScalar fAngle; 226 SkShader* fShader0; 227 SkShader* fShader1; 228 SkIPoint fSize0, fSize1; 229 SkPoint fPts[12]; 230 231public: 232 PatchView() : fAngle(0) { 233 fShader0 = make_shader0(&fSize0); 234 fSize1 = fSize0; 235 if (fSize0.fX == 0 || fSize0.fY == 0) { 236 fSize1.set(2, 2); 237 } 238 fShader1 = make_shader1(fSize1); 239 240 const SkScalar S = SkIntToScalar(50); 241 const SkScalar T = SkIntToScalar(40); 242 fPts[0].set(S*0, T); 243 fPts[1].set(S*1, T); 244 fPts[2].set(S*2, T); 245 fPts[3].set(S*3, T); 246 fPts[4].set(S*3, T*2); 247 fPts[5].set(S*3, T*3); 248 fPts[6].set(S*3, T*4); 249 fPts[7].set(S*2, T*4); 250 fPts[8].set(S*1, T*4); 251 fPts[9].set(S*0, T*4); 252 fPts[10].set(S*0, T*3); 253 fPts[11].set(S*0, T*2); 254 255 this->setBGColor(SK_ColorGRAY); 256 } 257 258 virtual ~PatchView() { 259 SkSafeUnref(fShader0); 260 SkSafeUnref(fShader1); 261 } 262 263protected: 264 // overrides from SkEventSink 265 bool onQuery(SkEvent* evt) override { 266 if (SampleCode::TitleQ(*evt)) { 267 SampleCode::TitleR(evt, "Patch"); 268 return true; 269 } 270 return this->INHERITED::onQuery(evt); 271 } 272 273 void onDrawContent(SkCanvas* canvas) override { 274 const int nu = 10; 275 const int nv = 10; 276 277 SkPaint paint; 278 paint.setDither(true); 279 paint.setFilterQuality(kLow_SkFilterQuality); 280 281 canvas->translate(DX, DY); 282 283 Patch patch; 284 285 paint.setShader(fShader0); 286 if (fSize0.fX == 0) { 287 fSize0.fX = 1; 288 } 289 if (fSize0.fY == 0) { 290 fSize0.fY = 1; 291 } 292 patch.setBounds(fSize0.fX, fSize0.fY); 293 294 patch.setPatch(fPts); 295 drawpatches(canvas, paint, nu, nv, &patch); 296 297 paint.setShader(nullptr); 298 paint.setAntiAlias(true); 299 paint.setStrokeWidth(SkIntToScalar(5)); 300 canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), fPts, paint); 301 302 canvas->translate(0, SkIntToScalar(300)); 303 304 paint.setAntiAlias(false); 305 paint.setShader(fShader1); 306 if (true) { 307 SkMatrix m; 308 m.setSkew(1, 0); 309 SkShader* s = paint.getShader()->newWithLocalMatrix(m); 310 paint.setShader(s)->unref(); 311 } 312 if (true) { 313 SkMatrix m; 314 m.setRotate(fAngle); 315 SkShader* s = paint.getShader()->newWithLocalMatrix(m); 316 paint.setShader(s)->unref(); 317 } 318 patch.setBounds(fSize1.fX, fSize1.fY); 319 drawpatches(canvas, paint, nu, nv, &patch); 320 } 321 322 bool onAnimate(const SkAnimTimer& timer) override { 323 fAngle = timer.scaled(60, 360); 324 return true; 325 } 326 327 class PtClick : public Click { 328 public: 329 int fIndex; 330 PtClick(SkView* view, int index) : Click(view), fIndex(index) {} 331 }; 332 333 static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) { 334 return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5); 335 } 336 337 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override { 338 x -= DX; 339 y -= DY; 340 for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) { 341 if (hittest(fPts[i], x, y)) { 342 return new PtClick(this, (int)i); 343 } 344 } 345 return this->INHERITED::onFindClickHandler(x, y, modi); 346 } 347 348 bool onClick(Click* click) override { 349 fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX - DX, click->fCurr.fY - DY); 350 this->inval(nullptr); 351 return true; 352 } 353 354private: 355 typedef SampleView INHERITED; 356}; 357 358////////////////////////////////////////////////////////////////////////////// 359 360static SkView* MyFactory() { return new PatchView; } 361static SkViewRegister reg(MyFactory); 362