reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | #include "SampleCode.h" |
| 2 | #include "SkView.h" |
| 3 | #include "SkCanvas.h" |
| 4 | #include "SkGradientShader.h" |
| 5 | #include "SkGraphics.h" |
| 6 | #include "SkImageDecoder.h" |
| 7 | #include "SkPath.h" |
| 8 | #include "SkPorterDuff.h" |
| 9 | #include "SkRandom.h" |
| 10 | #include "SkRegion.h" |
| 11 | #include "SkShader.h" |
| 12 | #include "SkUtils.h" |
| 13 | #include "SkXfermode.h" |
| 14 | #include "SkShaderExtras.h" |
| 15 | #include "SkColorPriv.h" |
| 16 | #include "SkColorFilter.h" |
| 17 | #include "SkTime.h" |
| 18 | #include "SkTypeface.h" |
| 19 | |
| 20 | #include "SkImageRef.h" |
| 21 | #include "SkOSFile.h" |
| 22 | #include "SkStream.h" |
| 23 | |
| 24 | #include "SkGeometry.h" // private include :( |
| 25 | |
| 26 | static void drawtriangle(SkCanvas* canvas, const SkPaint& paint, |
| 27 | const SkPoint pts[3]) { |
| 28 | SkPath path; |
| 29 | |
| 30 | path.moveTo(pts[0]); |
| 31 | path.lineTo(pts[1]); |
| 32 | path.lineTo(pts[2]); |
| 33 | |
| 34 | canvas->drawPath(path, paint); |
| 35 | } |
| 36 | |
| 37 | static SkShader* make_shader0(SkIPoint* size) { |
| 38 | SkBitmap bm; |
| 39 | |
| 40 | // SkImageDecoder::DecodeFile("/skimages/progressivejpg.jpg", &bm); |
| 41 | SkImageDecoder::DecodeFile("/skimages/beach.jpg", &bm); |
| 42 | size->set(bm.width(), bm.height()); |
| 43 | return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode, |
| 44 | SkShader::kClamp_TileMode); |
| 45 | } |
| 46 | |
| 47 | static SkShader* make_shader1(const SkIPoint& size) { |
| 48 | SkPoint pts[] = { 0, 0, SkIntToScalar(size.fX), SkIntToScalar(size.fY) }; |
| 49 | SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED }; |
| 50 | return SkGradientShader::CreateLinear(pts, colors, NULL, |
| 51 | SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode, NULL); |
| 52 | } |
| 53 | |
| 54 | /////////////////////////////////////////////////////////////////////////////// |
| 55 | |
| 56 | class Patch { |
| 57 | public: |
| 58 | Patch() { bzero(fPts, sizeof(fPts)); } |
| 59 | ~Patch() {} |
| 60 | |
| 61 | void setPatch(const SkPoint pts[12]) { |
| 62 | memcpy(fPts, pts, 12 * sizeof(SkPoint)); |
| 63 | fPts[12] = pts[0]; // the last shall be first |
| 64 | } |
| 65 | void setBounds(int w, int h) { fW = w; fH = h; } |
| 66 | |
| 67 | void draw(SkCanvas*, const SkPaint&, int segsU, int segsV, |
| 68 | bool doTextures, bool doColors); |
| 69 | |
| 70 | private: |
| 71 | SkPoint fPts[13]; |
| 72 | int fW, fH; |
| 73 | }; |
| 74 | |
| 75 | static void eval_patch_edge(const SkPoint cubic[], SkPoint samples[], int segs) { |
| 76 | SkScalar t = 0; |
| 77 | SkScalar dt = SK_Scalar1 / segs; |
| 78 | |
| 79 | samples[0] = cubic[0]; |
| 80 | for (int i = 1; i < segs; i++) { |
| 81 | t += dt; |
| 82 | SkEvalCubicAt(cubic, t, &samples[i], NULL, NULL); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | static void eval_sheet(const SkPoint edge[], int nu, int nv, int iu, int iv, |
| 87 | SkPoint* pt) { |
| 88 | const int TL = 0; |
| 89 | const int TR = nu; |
| 90 | const int BR = TR + nv; |
| 91 | const int BL = BR + nu; |
| 92 | |
| 93 | SkScalar u = SkIntToScalar(iu) / nu; |
| 94 | SkScalar v = SkIntToScalar(iv) / nv; |
| 95 | |
| 96 | SkScalar uv = SkScalarMul(u, v); |
| 97 | SkScalar Uv = SkScalarMul(SK_Scalar1 - u, v); |
| 98 | SkScalar uV = SkScalarMul(u, SK_Scalar1 - v); |
| 99 | SkScalar UV = SkScalarMul(SK_Scalar1 - u, SK_Scalar1 - v); |
| 100 | |
| 101 | SkScalar x0 = SkScalarMul(UV, edge[TL].fX) + SkScalarMul(uV, edge[TR].fX) + |
| 102 | SkScalarMul(Uv, edge[BL].fX) + SkScalarMul(uv, edge[BR].fX); |
| 103 | SkScalar y0 = SkScalarMul(UV, edge[TL].fY) + SkScalarMul(uV, edge[TR].fY) + |
| 104 | SkScalarMul(Uv, edge[BL].fY) + SkScalarMul(uv, edge[BR].fY); |
| 105 | |
| 106 | SkScalar x = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fX) + |
| 107 | SkScalarMul(u, edge[TR+iv].fX) + |
| 108 | SkScalarMul(v, edge[BR+nu-iu].fX) + |
| 109 | SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fX) - x0; |
| 110 | SkScalar y = SkScalarMul(SK_Scalar1 - v, edge[TL+iu].fY) + |
| 111 | SkScalarMul(u, edge[TR+iv].fY) + |
| 112 | SkScalarMul(v, edge[BR+nu-iu].fY) + |
| 113 | SkScalarMul(SK_Scalar1 - u, edge[BL+nv-iv].fY) - y0; |
| 114 | pt->set(x, y); |
| 115 | } |
| 116 | |
| 117 | static int ScalarTo255(SkScalar v) { |
| 118 | int scale = SkScalarToFixed(v) >> 8; |
| 119 | if (scale < 0) { |
| 120 | scale = 0; |
| 121 | } else if (scale > 255) { |
| 122 | scale = 255; |
| 123 | } |
| 124 | return scale; |
| 125 | } |
| 126 | |
| 127 | static SkColor make_color(SkScalar s, SkScalar t) { |
| 128 | int cs = ScalarTo255(s); |
| 129 | int ct = ScalarTo255(t); |
| 130 | return SkColorSetARGB(0xFF, cs, 0, 0) + SkColorSetARGB(0, 0, ct, 0); |
| 131 | } |
| 132 | |
| 133 | void Patch::draw(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, |
| 134 | bool doTextures, bool doColors) { |
| 135 | if (nu < 1 || nv < 1) { |
| 136 | return; |
| 137 | } |
| 138 | |
| 139 | int i, npts = (nu + nv) * 2; |
| 140 | SkAutoSTMalloc<16, SkPoint> storage(npts + 1); |
| 141 | SkPoint* edge0 = storage.get(); |
| 142 | SkPoint* edge1 = edge0 + nu; |
| 143 | SkPoint* edge2 = edge1 + nv; |
| 144 | SkPoint* edge3 = edge2 + nu; |
| 145 | |
| 146 | // evaluate the edge points |
| 147 | eval_patch_edge(fPts + 0, edge0, nu); |
| 148 | eval_patch_edge(fPts + 3, edge1, nv); |
| 149 | eval_patch_edge(fPts + 6, edge2, nu); |
| 150 | eval_patch_edge(fPts + 9, edge3, nv); |
| 151 | edge3[nv] = edge0[0]; // the last shall be first |
| 152 | |
| 153 | for (i = 0; i < npts; i++) { |
| 154 | // canvas->drawLine(edge0[i].fX, edge0[i].fY, edge0[i+1].fX, edge0[i+1].fY, paint); |
| 155 | } |
| 156 | |
| 157 | int row, vertCount = (nu + 1) * (nv + 1); |
| 158 | SkAutoTMalloc<SkPoint> vertStorage(vertCount); |
| 159 | SkPoint* verts = vertStorage.get(); |
| 160 | |
| 161 | // first row |
| 162 | memcpy(verts, edge0, (nu + 1) * sizeof(SkPoint)); |
| 163 | // rows |
| 164 | SkPoint* r = verts; |
| 165 | for (row = 1; row < nv; row++) { |
| 166 | r += nu + 1; |
| 167 | r[0] = edge3[nv - row]; |
| 168 | for (int col = 1; col < nu; col++) { |
| 169 | eval_sheet(edge0, nu, nv, col, row, &r[col]); |
| 170 | } |
| 171 | r[nu] = edge1[row]; |
| 172 | } |
| 173 | // last row |
| 174 | SkPoint* last = verts + nv * (nu + 1); |
| 175 | for (i = 0; i <= nu; i++) { |
| 176 | last[i] = edge2[nu - i]; |
| 177 | } |
| 178 | |
| 179 | // canvas->drawPoints(verts, vertCount, paint); |
| 180 | |
| 181 | int stripCount = (nu + 1) * 2; |
| 182 | SkAutoTMalloc<SkPoint> stripStorage(stripCount * 2); |
| 183 | SkAutoTMalloc<SkColor> colorStorage(stripCount); |
| 184 | SkPoint* strip = stripStorage.get(); |
| 185 | SkPoint* tex = strip + stripCount; |
| 186 | SkColor* colors = colorStorage.get(); |
| 187 | SkScalar t = 0; |
| 188 | const SkScalar ds = SK_Scalar1 * fW / nu; |
| 189 | const SkScalar dt = SK_Scalar1 * fH / nv; |
| 190 | r = verts; |
| 191 | for (row = 0; row < nv; row++) { |
| 192 | SkPoint* upper = r; |
| 193 | SkPoint* lower = r + nu + 1; |
| 194 | r = lower; |
| 195 | SkScalar s = 0; |
| 196 | for (i = 0; i <= nu; i++) { |
| 197 | strip[i*2 + 0] = *upper++; |
| 198 | strip[i*2 + 1] = *lower++; |
| 199 | tex[i*2 + 0].set(s, t); |
| 200 | tex[i*2 + 1].set(s, t + dt); |
| 201 | colors[i*2 + 0] = make_color(s/fW, t/fH); |
| 202 | colors[i*2 + 1] = make_color(s/fW, (t + dt)/fH); |
| 203 | s += ds; |
| 204 | } |
| 205 | t += dt; |
| 206 | canvas->drawVertices(SkCanvas::kTriangleStrip_VertexMode, stripCount, |
| 207 | strip, doTextures ? tex : NULL, |
| 208 | doColors ? colors : NULL, NULL, |
| 209 | NULL, 0, paint); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | static void drawpatches(SkCanvas* canvas, const SkPaint& paint, int nu, int nv, |
| 214 | Patch* patch) { |
| 215 | |
| 216 | SkAutoCanvasRestore ar(canvas, true); |
| 217 | |
| 218 | patch->draw(canvas, paint, 10, 10, false, false); |
| 219 | canvas->translate(SkIntToScalar(300), 0); |
| 220 | patch->draw(canvas, paint, 10, 10, true, false); |
| 221 | canvas->translate(SkIntToScalar(300), 0); |
| 222 | patch->draw(canvas, paint, 10, 10, false, true); |
| 223 | canvas->translate(SkIntToScalar(300), 0); |
| 224 | patch->draw(canvas, paint, 10, 10, true, true); |
| 225 | } |
| 226 | |
| 227 | class PatchView : public SkView { |
| 228 | SkShader* fShader0; |
| 229 | SkShader* fShader1; |
| 230 | SkIPoint fSize0, fSize1; |
| 231 | SkPoint fPts[12]; |
| 232 | |
| 233 | public: |
| 234 | PatchView() { |
| 235 | fShader0 = make_shader0(&fSize0); |
| 236 | fSize1 = fSize0; |
| 237 | if (fSize0.fX == 0 || fSize0.fY == 0) { |
| 238 | fSize1.set(2, 2); |
| 239 | } |
| 240 | fShader1 = make_shader1(fSize1); |
| 241 | |
| 242 | const SkScalar S = SkIntToScalar(90); |
| 243 | const SkScalar T = SkIntToScalar(64); |
| 244 | fPts[0].set(S*1, T); |
| 245 | fPts[1].set(S*2, T); |
| 246 | fPts[2].set(S*3, T); |
| 247 | fPts[3].set(S*4, T); |
| 248 | fPts[4].set(S*4, T*2); |
| 249 | fPts[5].set(S*4, T*3); |
| 250 | fPts[6].set(S*4, T*4); |
| 251 | fPts[7].set(S*3, T*4); |
| 252 | fPts[8].set(S*2, T*4); |
| 253 | fPts[9].set(S*1, T*4); |
| 254 | fPts[10].set(S*1, T*3); |
| 255 | fPts[11].set(S*1, T*2); |
| 256 | } |
| 257 | |
| 258 | virtual ~PatchView() { |
| 259 | fShader0->safeUnref(); |
| 260 | fShader1->safeUnref(); |
| 261 | } |
| 262 | |
| 263 | protected: |
| 264 | // overrides from SkEventSink |
| 265 | virtual bool onQuery(SkEvent* evt) { |
| 266 | if (SampleCode::TitleQ(*evt)) |
| 267 | { |
| 268 | SkString str("Patch"); |
| 269 | SampleCode::TitleR(evt, str.c_str()); |
| 270 | return true; |
| 271 | } |
| 272 | return this->INHERITED::onQuery(evt); |
| 273 | } |
| 274 | |
| 275 | void drawBG(SkCanvas* canvas) { |
| 276 | canvas->drawColor(SK_ColorGRAY); |
| 277 | } |
| 278 | |
| 279 | virtual void onDraw(SkCanvas* canvas) { |
| 280 | this->drawBG(canvas); |
| 281 | |
| 282 | SkPaint paint; |
| 283 | paint.setDither(true); |
| 284 | paint.setFilterBitmap(true); |
| 285 | |
| 286 | if (false) { |
| 287 | SkPath p; |
| 288 | p.moveTo(0, 0); |
| 289 | p.lineTo(SkIntToScalar(30000), SkIntToScalar(30000)); |
| 290 | paint.setStyle(SkPaint::kStroke_Style); |
| 291 | paint.setStrokeWidth(SkIntToScalar(4)); |
| 292 | paint.setAntiAlias(true); |
| 293 | canvas->scale(SkIntToScalar(3), SkIntToScalar(3)); |
| 294 | canvas->drawPath(p, paint); |
| 295 | return; |
| 296 | } |
| 297 | |
| 298 | if (false) { |
| 299 | for (int dy = -1; dy <= 2; dy++) { |
| 300 | canvas->save(); |
| 301 | if (dy == 2) { |
| 302 | canvas->translate(0, SK_Scalar1/2); |
| 303 | } else { |
| 304 | canvas->translate(0, SkIntToScalar(dy)/100); |
| 305 | } |
| 306 | |
| 307 | SkBitmap bm; |
| 308 | bm.setConfig(SkBitmap::kARGB_8888_Config, 20, 20); |
| 309 | bm.allocPixels(); |
| 310 | SkCanvas c(bm); |
| 311 | SkRect r = { 0, 0, 20*SK_Scalar1, SK_Scalar1 }; |
| 312 | for (int y = 0; y < 20; y++) { |
| 313 | SkPaint p; |
| 314 | p.setARGB(0xFF, y*5&0xFF, y*13&0xFF, y*29&0xFF); |
| 315 | c.drawRect(r, p); |
| 316 | r.offset(0, SK_Scalar1); |
| 317 | } |
| 318 | SkIRect src; |
| 319 | SkRect dst; |
| 320 | |
| 321 | static const int srcPts[] = { |
| 322 | // 2, 0, 15, 2, |
| 323 | 2, 2, 15, 16, |
| 324 | 17, 2, 2, 16, |
| 325 | 19, 2, 1, 16, |
| 326 | // 2, 18, 15, 2 |
| 327 | }; |
| 328 | static const double dstPts[] = { |
| 329 | // 7, 262 15, 24.5, |
| 330 | 7, 286.5, 15, 16, |
| 331 | 22, 286.5, 5, 16, |
| 332 | 27, 286.5, 1, 16, |
| 333 | // 7, 302.5, 15, 24.5 |
| 334 | }; |
| 335 | |
| 336 | SkPaint p; |
| 337 | // p.setFilterBitmap(true); |
| 338 | const int* s = srcPts; |
| 339 | const double* d = dstPts; |
| 340 | for (int i = 0; i < 3; i++) { |
| 341 | src.set(s[0], s[1], s[0]+s[2], s[1]+s[3]); |
| 342 | dst.set(SkDoubleToScalar(d[0]), |
| 343 | SkDoubleToScalar(d[1]), |
| 344 | SkDoubleToScalar(d[0]+d[2]), |
| 345 | SkDoubleToScalar(d[1]+d[3])); |
| 346 | canvas->drawBitmapRect(bm, &src, dst, &p); |
| 347 | canvas->translate(SkDoubleToScalar(1), 0); |
| 348 | s += 4; |
| 349 | d += 4; |
| 350 | } |
| 351 | canvas->restore(); |
| 352 | canvas->translate(SkIntToScalar(32), 0); |
| 353 | } |
| 354 | return; |
| 355 | } |
| 356 | |
| 357 | Patch patch; |
| 358 | |
| 359 | paint.setShader(fShader0); |
| 360 | if (fSize0.fX == 0) { |
| 361 | fSize0.fX = 1; |
| 362 | } |
| 363 | if (fSize0.fY == 0) { |
| 364 | fSize0.fY = 1; |
| 365 | } |
| 366 | patch.setBounds(fSize0.fX, fSize0.fY); |
| 367 | |
| 368 | patch.setPatch(fPts); |
| 369 | drawpatches(canvas, paint, 10, 10, &patch); |
| 370 | |
| 371 | paint.setShader(NULL); |
| 372 | paint.setAntiAlias(true); |
| 373 | paint.setStrokeWidth(SkIntToScalar(5)); |
| 374 | canvas->drawPoints(SkCanvas::kPoints_PointMode, SK_ARRAY_COUNT(fPts), |
| 375 | fPts, paint); |
| 376 | |
| 377 | canvas->translate(0, SkIntToScalar(300)); |
| 378 | |
| 379 | paint.setAntiAlias(false); |
| 380 | paint.setShader(fShader1); |
| 381 | patch.setBounds(fSize1.fX, fSize1.fY); |
| 382 | drawpatches(canvas, paint, 10, 10, &patch); |
| 383 | } |
| 384 | |
| 385 | class PtClick : public Click { |
| 386 | public: |
| 387 | int fIndex; |
| 388 | PtClick(SkView* view, int index) : Click(view), fIndex(index) {} |
| 389 | }; |
| 390 | |
| 391 | static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) { |
| 392 | return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5); |
| 393 | } |
| 394 | |
| 395 | virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) { |
| 396 | for (int i = 0; i < SK_ARRAY_COUNT(fPts); i++) { |
| 397 | if (hittest(fPts[i], x, y)) { |
| 398 | return new PtClick(this, i); |
| 399 | } |
| 400 | } |
| 401 | return this->INHERITED::onFindClickHandler(x, y); |
| 402 | } |
| 403 | |
| 404 | virtual bool onClick(Click* click) { |
| 405 | fPts[((PtClick*)click)->fIndex].set(click->fCurr.fX, click->fCurr.fY); |
| 406 | this->inval(NULL); |
| 407 | return true; |
| 408 | } |
| 409 | |
| 410 | private: |
| 411 | typedef SkView INHERITED; |
| 412 | }; |
| 413 | |
| 414 | ////////////////////////////////////////////////////////////////////////////// |
| 415 | |
| 416 | static SkView* MyFactory() { return new PatchView; } |
| 417 | static SkViewRegister reg(MyFactory); |
| 418 | |