csmartdalton | ed4984b | 2017-02-13 14:57:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 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 "SkCanvas.h" |
| 11 | #include "SkGlyphCache.h" |
| 12 | #include "SkPaint.h" |
| 13 | #include "SkPath.h" |
| 14 | #include "SkRandom.h" |
| 15 | #include "SkTaskGroup.h" |
| 16 | |
| 17 | //////////////////////////////////////////////////////////////////////////////////////////////////// |
| 18 | // Static text from paths. |
| 19 | class PathText : public SampleView { |
| 20 | public: |
| 21 | constexpr static int kNumPaths = 1500; |
| 22 | virtual const char* getName() const { return "PathText"; } |
| 23 | |
| 24 | PathText() : fRand(25) { |
| 25 | SkPaint defaultPaint; |
| 26 | SkAutoGlyphCache agc(defaultPaint, nullptr, &SkMatrix::I()); |
| 27 | SkGlyphCache* cache = agc.getCache(); |
| 28 | SkPath glyphPaths[52]; |
| 29 | for (int i = 0; i < 52; ++i) { |
| 30 | // I and l are rects on OS X ... |
| 31 | char c = "aQCDEFGH7JKLMNOPBRZTUVWXYSAbcdefghijk1mnopqrstuvwxyz"[i]; |
| 32 | SkGlyphID id = cache->unicharToGlyph(c); |
| 33 | cache->getScalerContext()->getPath(SkPackedGlyphID(id), &glyphPaths[i]); |
| 34 | } |
| 35 | |
| 36 | for (int i = 0; i < kNumPaths; ++i) { |
| 37 | const SkPath& p = glyphPaths[i % 52]; |
| 38 | fGlyphs[i].init(fRand, p); |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | virtual void reset() { |
| 43 | for (Glyph& glyph : fGlyphs) { |
| 44 | glyph.reset(fRand, this->width(), this->height()); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | void onOnceBeforeDraw() final { this->INHERITED::onOnceBeforeDraw(); this->reset(); } |
| 49 | void onSizeChange() final { this->INHERITED::onSizeChange(); this->reset(); } |
| 50 | |
| 51 | bool onQuery(SkEvent* evt) final { |
| 52 | if (SampleCode::TitleQ(*evt)) { |
| 53 | SampleCode::TitleR(evt, this->getName()); |
| 54 | return true; |
| 55 | } |
| 56 | return this->INHERITED::onQuery(evt); |
| 57 | } |
| 58 | |
| 59 | void onDrawContent(SkCanvas* canvas) override { |
| 60 | for (Glyph& glyph : fGlyphs) { |
| 61 | SkAutoCanvasRestore acr(canvas, true); |
| 62 | canvas->translate(glyph.fPosition.x(), glyph.fPosition.y()); |
| 63 | canvas->scale(glyph.fZoom, glyph.fZoom); |
| 64 | canvas->rotate(glyph.fSpin); |
| 65 | canvas->translate(-glyph.fMidpt.x(), -glyph.fMidpt.y()); |
| 66 | canvas->drawPath(glyph.fPath, glyph.fPaint); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | protected: |
| 71 | struct Glyph { |
| 72 | void init(SkRandom& rand, const SkPath& path); |
| 73 | void reset(SkRandom& rand, int w, int h); |
| 74 | |
| 75 | SkPath fPath; |
| 76 | SkPaint fPaint; |
| 77 | SkPoint fPosition; |
| 78 | SkScalar fZoom; |
| 79 | SkScalar fSpin; |
| 80 | SkPoint fMidpt; |
| 81 | }; |
| 82 | |
| 83 | Glyph fGlyphs[kNumPaths]; |
| 84 | SkRandom fRand; |
| 85 | |
| 86 | typedef SampleView INHERITED; |
| 87 | }; |
| 88 | |
| 89 | void PathText::Glyph::init(SkRandom& rand, const SkPath& path) { |
| 90 | fPath = path; |
| 91 | fPaint.setAntiAlias(true); |
| 92 | fPaint.setColor(rand.nextU() | 0x80808080); |
| 93 | } |
| 94 | |
| 95 | void PathText::Glyph::reset(SkRandom& rand, int w, int h) { |
| 96 | int screensize = SkTMax(w, h); |
| 97 | const SkRect& bounds = fPath.getBounds(); |
| 98 | SkScalar t; |
| 99 | |
| 100 | fPosition = {rand.nextF() * w, rand.nextF() * h}; |
| 101 | t = pow(rand.nextF(), 100); |
| 102 | fZoom = ((1 - t) * screensize / 50 + t * screensize / 3) / |
| 103 | SkTMax(bounds.width(), bounds.height()); |
| 104 | fSpin = rand.nextF() * 360; |
| 105 | fMidpt = {bounds.centerX(), bounds.centerY()}; |
| 106 | } |
| 107 | |
| 108 | //////////////////////////////////////////////////////////////////////////////////////////////////// |
| 109 | // Text from paths with animated transformation matrices. |
| 110 | class MovingPathText : public PathText { |
| 111 | public: |
| 112 | const char* getName() const override { return "MovingPathText"; } |
| 113 | |
| 114 | MovingPathText() |
| 115 | : fFrontMatrices(kNumPaths) |
| 116 | , fBackMatrices(kNumPaths) { |
| 117 | } |
| 118 | |
Brian Salomon | d3b6597 | 2017-03-22 12:05:03 -0400 | [diff] [blame] | 119 | ~MovingPathText() override { |
csmartdalton | ed4984b | 2017-02-13 14:57:28 -0700 | [diff] [blame] | 120 | fBackgroundAnimationTask.wait(); |
| 121 | } |
| 122 | |
| 123 | void reset() override { |
| 124 | const SkScalar screensize = static_cast<SkScalar>(SkTMax(this->width(), this->height())); |
| 125 | this->INHERITED::reset(); |
| 126 | |
| 127 | for (auto& v : fVelocities) { |
| 128 | for (SkScalar* d : {&v.fDx, &v.fDy}) { |
| 129 | SkScalar t = pow(fRand.nextF(), 3); |
| 130 | *d = ((1 - t) / 60 + t / 10) * (fRand.nextBool() ? screensize : -screensize); |
| 131 | } |
| 132 | |
| 133 | SkScalar t = pow(fRand.nextF(), 25); |
| 134 | v.fDSpin = ((1 - t) * 360 / 7.5 + t * 360 / 1.5) * (fRand.nextBool() ? 1 : -1); |
| 135 | } |
| 136 | |
| 137 | // Get valid front data. |
| 138 | fBackgroundAnimationTask.wait(); |
| 139 | this->runAnimationTask(0, 0, this->width(), this->height()); |
| 140 | memcpy(fFrontMatrices, fBackMatrices, kNumPaths * sizeof(SkMatrix)); |
| 141 | fLastTick = 0; |
| 142 | } |
| 143 | |
| 144 | bool onAnimate(const SkAnimTimer& timer) final { |
| 145 | fBackgroundAnimationTask.wait(); |
| 146 | this->swapAnimationBuffers(); |
| 147 | |
| 148 | const double tsec = timer.secs(); |
| 149 | const double dt = fLastTick ? (timer.secs() - fLastTick) : 0; |
| 150 | fBackgroundAnimationTask.add(std::bind(&MovingPathText::runAnimationTask, this, tsec, |
| 151 | dt, this->width(), this->height())); |
| 152 | fLastTick = timer.secs(); |
| 153 | return true; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Called on a background thread. Here we can only modify fBackMatrices. |
| 158 | */ |
| 159 | virtual void runAnimationTask(double t, double dt, int w, int h) { |
| 160 | for (int idx = 0; idx < kNumPaths; ++idx) { |
| 161 | Velocity* v = &fVelocities[idx]; |
| 162 | Glyph* glyph = &fGlyphs[idx]; |
| 163 | SkMatrix* backMatrix = &fBackMatrices[idx]; |
| 164 | |
| 165 | glyph->fPosition.fX += v->fDx * dt; |
| 166 | if (glyph->fPosition.x() < 0) { |
| 167 | glyph->fPosition.fX -= 2 * glyph->fPosition.x(); |
| 168 | v->fDx = -v->fDx; |
| 169 | } else if (glyph->fPosition.x() > w) { |
| 170 | glyph->fPosition.fX -= 2 * (glyph->fPosition.x() - w); |
| 171 | v->fDx = -v->fDx; |
| 172 | } |
| 173 | |
| 174 | glyph->fPosition.fY += v->fDy * dt; |
| 175 | if (glyph->fPosition.y() < 0) { |
| 176 | glyph->fPosition.fY -= 2 * glyph->fPosition.y(); |
| 177 | v->fDy = -v->fDy; |
| 178 | } else if (glyph->fPosition.y() > h) { |
| 179 | glyph->fPosition.fY -= 2 * (glyph->fPosition.y() - h); |
| 180 | v->fDy = -v->fDy; |
| 181 | } |
| 182 | |
| 183 | glyph->fSpin += v->fDSpin * dt; |
| 184 | |
| 185 | backMatrix->setTranslate(glyph->fPosition.x(), glyph->fPosition.y()); |
| 186 | backMatrix->preScale(glyph->fZoom, glyph->fZoom); |
| 187 | backMatrix->preRotate(glyph->fSpin); |
| 188 | backMatrix->preTranslate(-glyph->fMidpt.x(), -glyph->fMidpt.y()); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | virtual void swapAnimationBuffers() { |
| 193 | std::swap(fFrontMatrices, fBackMatrices); |
| 194 | } |
| 195 | |
| 196 | void onDrawContent(SkCanvas* canvas) override { |
| 197 | for (int i = 0; i < kNumPaths; ++i) { |
| 198 | SkAutoCanvasRestore acr(canvas, true); |
| 199 | canvas->concat(fFrontMatrices[i]); |
| 200 | canvas->drawPath(fGlyphs[i].fPath, fGlyphs[i].fPaint); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | protected: |
| 205 | struct Velocity { |
| 206 | SkScalar fDx, fDy; |
| 207 | SkScalar fDSpin; |
| 208 | }; |
| 209 | |
| 210 | Velocity fVelocities[kNumPaths]; |
| 211 | SkAutoTMalloc<SkMatrix> fFrontMatrices; |
| 212 | SkAutoTMalloc<SkMatrix> fBackMatrices; |
| 213 | SkTaskGroup fBackgroundAnimationTask; |
| 214 | double fLastTick; |
| 215 | |
| 216 | typedef PathText INHERITED; |
| 217 | }; |
| 218 | |
| 219 | |
| 220 | //////////////////////////////////////////////////////////////////////////////////////////////////// |
| 221 | // Text from paths with animated control points. |
| 222 | class WavyPathText : public MovingPathText { |
| 223 | public: |
| 224 | const char* getName() const override { return "WavyPathText"; } |
| 225 | |
| 226 | WavyPathText() |
| 227 | : fFrontPaths(kNumPaths) |
| 228 | , fBackPaths(kNumPaths) {} |
| 229 | |
Brian Salomon | d3b6597 | 2017-03-22 12:05:03 -0400 | [diff] [blame] | 230 | ~WavyPathText() override { |
csmartdalton | ed4984b | 2017-02-13 14:57:28 -0700 | [diff] [blame] | 231 | fBackgroundAnimationTask.wait(); |
| 232 | } |
| 233 | |
| 234 | void reset() override { |
| 235 | fWaves.reset(fRand, this->width(), this->height()); |
| 236 | this->INHERITED::reset(); |
| 237 | std::copy(fBackPaths.get(), fBackPaths.get() + kNumPaths, fFrontPaths.get()); |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Called on a background thread. Here we can only modify fBackPaths. |
| 242 | */ |
| 243 | void runAnimationTask(double t, double dt, int w, int h) override { |
| 244 | const float tsec = static_cast<float>(t); |
| 245 | this->INHERITED::runAnimationTask(t, 0.5 * dt, w, h); |
| 246 | |
| 247 | for (int i = 0; i < kNumPaths; ++i) { |
| 248 | const Glyph& glyph = fGlyphs[i]; |
| 249 | const SkMatrix& backMatrix = fBackMatrices[i]; |
| 250 | |
| 251 | const Sk2f matrix[3] = { |
| 252 | Sk2f(backMatrix.getScaleX(), backMatrix.getSkewY()), |
| 253 | Sk2f(backMatrix.getSkewX(), backMatrix.getScaleY()), |
| 254 | Sk2f(backMatrix.getTranslateX(), backMatrix.getTranslateY()) |
| 255 | }; |
| 256 | |
| 257 | SkPath* backpath = &fBackPaths[i]; |
| 258 | backpath->reset(); |
| 259 | backpath->setFillType(SkPath::kEvenOdd_FillType); |
| 260 | |
| 261 | SkPath::RawIter iter(glyph.fPath); |
| 262 | SkPath::Verb verb; |
| 263 | SkPoint pts[4]; |
| 264 | |
| 265 | while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { |
| 266 | switch (verb) { |
| 267 | case SkPath::kMove_Verb: { |
| 268 | SkPoint pt = fWaves.apply(tsec, matrix, pts[0]); |
| 269 | backpath->moveTo(pt.x(), pt.y()); |
| 270 | break; |
| 271 | } |
| 272 | case SkPath::kLine_Verb: { |
| 273 | SkPoint endpt = fWaves.apply(tsec, matrix, pts[1]); |
| 274 | backpath->lineTo(endpt.x(), endpt.y()); |
| 275 | break; |
| 276 | } |
| 277 | case SkPath::kQuad_Verb: { |
| 278 | SkPoint controlPt = fWaves.apply(tsec, matrix, pts[1]); |
| 279 | SkPoint endpt = fWaves.apply(tsec, matrix, pts[2]); |
| 280 | backpath->quadTo(controlPt.x(), controlPt.y(), endpt.x(), endpt.y()); |
| 281 | break; |
| 282 | } |
| 283 | case SkPath::kClose_Verb: { |
| 284 | backpath->close(); |
| 285 | break; |
| 286 | } |
| 287 | case SkPath::kCubic_Verb: |
| 288 | case SkPath::kConic_Verb: |
| 289 | case SkPath::kDone_Verb: |
| 290 | SkFAIL("Unexpected path verb"); |
| 291 | break; |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | void swapAnimationBuffers() override { |
| 298 | this->INHERITED::swapAnimationBuffers(); |
| 299 | fFrontPaths.swap(fBackPaths); |
| 300 | } |
| 301 | |
| 302 | void onDrawContent(SkCanvas* canvas) override { |
| 303 | for (int i = 0; i < kNumPaths; ++i) { |
| 304 | canvas->drawPath(fFrontPaths[i], fGlyphs[i].fPaint); |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | private: |
| 309 | /** |
| 310 | * Describes 4 stacked sine waves that can offset a point as a function of wall time. |
| 311 | */ |
| 312 | class Waves { |
| 313 | public: |
| 314 | void reset(SkRandom& rand, int w, int h); |
| 315 | SkPoint apply(float tsec, const Sk2f matrix[3], const SkPoint& pt) const; |
| 316 | |
| 317 | private: |
| 318 | constexpr static double kAverageAngle = SK_ScalarPI / 8.0; |
| 319 | constexpr static double kMaxOffsetAngle = SK_ScalarPI / 3.0; |
| 320 | |
| 321 | float fAmplitudes[4]; |
| 322 | float fFrequencies[4]; |
| 323 | float fDirsX[4]; |
| 324 | float fDirsY[4]; |
| 325 | float fSpeeds[4]; |
| 326 | float fOffsets[4]; |
| 327 | }; |
| 328 | |
| 329 | SkAutoTArray<SkPath> fFrontPaths; |
| 330 | SkAutoTArray<SkPath> fBackPaths; |
| 331 | Waves fWaves; |
| 332 | |
| 333 | typedef MovingPathText INHERITED; |
| 334 | }; |
| 335 | |
| 336 | void WavyPathText::Waves::reset(SkRandom& rand, int w, int h) { |
| 337 | const double pixelsPerMeter = 0.06 * SkTMax(w, h); |
| 338 | const double medianWavelength = 8 * pixelsPerMeter; |
| 339 | const double medianWaveAmplitude = 0.05 * 4 * pixelsPerMeter; |
| 340 | const double gravity = 9.8 * pixelsPerMeter; |
| 341 | |
| 342 | for (int i = 0; i < 4; ++i) { |
| 343 | const double offsetAngle = (rand.nextF() * 2 - 1) * kMaxOffsetAngle; |
| 344 | const double intensity = pow(2, rand.nextF() * 2 - 1); |
| 345 | const double wavelength = intensity * medianWavelength; |
| 346 | |
| 347 | fAmplitudes[i] = intensity * medianWaveAmplitude; |
| 348 | fFrequencies[i] = 2 * SK_ScalarPI / wavelength; |
| 349 | fDirsX[i] = cosf(kAverageAngle + offsetAngle); |
| 350 | fDirsY[i] = sinf(kAverageAngle + offsetAngle); |
| 351 | fSpeeds[i] = -sqrt(gravity * 2 * SK_ScalarPI / wavelength); |
| 352 | fOffsets[i] = rand.nextF() * 2 * SK_ScalarPI; |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | SkPoint WavyPathText::Waves::apply(float tsec, const Sk2f matrix[3], const SkPoint& pt) const { |
Chris Dalton | 95cf166 | 2017-06-20 16:32:59 -0700 | [diff] [blame] | 357 | constexpr static int kTablePeriod = 1 << 12; |
| 358 | static float sin2table[kTablePeriod + 1]; |
csmartdalton | ed4984b | 2017-02-13 14:57:28 -0700 | [diff] [blame] | 359 | static SkOnce initTable; |
| 360 | initTable([]() { |
Chris Dalton | 95cf166 | 2017-06-20 16:32:59 -0700 | [diff] [blame] | 361 | for (int i = 0; i <= kTablePeriod; ++i) { |
| 362 | const double sintheta = sin(i * (SK_ScalarPI / kTablePeriod)); |
csmartdalton | ed4984b | 2017-02-13 14:57:28 -0700 | [diff] [blame] | 363 | sin2table[i] = static_cast<float>(sintheta * sintheta - 0.5); |
| 364 | } |
| 365 | }); |
| 366 | |
| 367 | const Sk4f amplitudes = Sk4f::Load(fAmplitudes); |
| 368 | const Sk4f frequencies = Sk4f::Load(fFrequencies); |
| 369 | const Sk4f dirsX = Sk4f::Load(fDirsX); |
| 370 | const Sk4f dirsY = Sk4f::Load(fDirsY); |
| 371 | const Sk4f speeds = Sk4f::Load(fSpeeds); |
| 372 | const Sk4f offsets = Sk4f::Load(fOffsets); |
| 373 | |
| 374 | float devicePt[2]; |
| 375 | (matrix[0] * pt.x() + matrix[1] * pt.y() + matrix[2]).store(devicePt); |
| 376 | |
| 377 | const Sk4f t = (frequencies * (dirsX * devicePt[0] + dirsY * devicePt[1]) + |
| 378 | speeds * tsec + |
Chris Dalton | 95cf166 | 2017-06-20 16:32:59 -0700 | [diff] [blame] | 379 | offsets).abs() * (float(kTablePeriod) / float(SK_ScalarPI)); |
csmartdalton | ed4984b | 2017-02-13 14:57:28 -0700 | [diff] [blame] | 380 | |
| 381 | const Sk4i ipart = SkNx_cast<int>(t); |
| 382 | const Sk4f fpart = t - SkNx_cast<float>(ipart); |
| 383 | |
| 384 | int32_t indices[4]; |
Chris Dalton | 95cf166 | 2017-06-20 16:32:59 -0700 | [diff] [blame] | 385 | (ipart & (kTablePeriod-1)).store(indices); |
csmartdalton | ed4984b | 2017-02-13 14:57:28 -0700 | [diff] [blame] | 386 | |
| 387 | const Sk4f left(sin2table[indices[0]], sin2table[indices[1]], |
| 388 | sin2table[indices[2]], sin2table[indices[3]]); |
| 389 | const Sk4f right(sin2table[indices[0] + 1], sin2table[indices[1] + 1], |
| 390 | sin2table[indices[2] + 1], sin2table[indices[3] + 1]); |
| 391 | const Sk4f height = amplitudes * (left * (1.f - fpart) + right * fpart); |
| 392 | |
| 393 | Sk4f dy = height * dirsY; |
| 394 | Sk4f dx = height * dirsX; |
| 395 | |
| 396 | float offsetY[4], offsetX[4]; |
| 397 | (dy + SkNx_shuffle<2,3,0,1>(dy)).store(offsetY); // accumulate. |
| 398 | (dx + SkNx_shuffle<2,3,0,1>(dx)).store(offsetX);; |
| 399 | |
| 400 | return {devicePt[0] + offsetY[0] + offsetY[1], devicePt[1] - offsetX[0] - offsetX[1]}; |
| 401 | } |
| 402 | |
| 403 | //////////////////////////////////////////////////////////////////////////////////////////////////// |
| 404 | |
| 405 | DEF_SAMPLE( return new WavyPathText; ) |
| 406 | DEF_SAMPLE( return new MovingPathText; ) |
| 407 | DEF_SAMPLE( return new PathText; ) |