1 /* 2 * Copyright 2014 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 "GrDashingEffect.h" 9 10 #include "GrBatchFlushState.h" 11 #include "GrBatchTest.h" 12 #include "GrCaps.h" 13 #include "GrGeometryProcessor.h" 14 #include "GrContext.h" 15 #include "GrCoordTransform.h" 16 #include "GrDefaultGeoProcFactory.h" 17 #include "GrDrawTarget.h" 18 #include "GrInvariantOutput.h" 19 #include "GrProcessor.h" 20 #include "GrStrokeInfo.h" 21 #include "GrVertexBuffer.h" 22 #include "SkGr.h" 23 #include "batches/GrVertexBatch.h" 24 #include "glsl/GrGLSLFragmentShaderBuilder.h" 25 #include "glsl/GrGLSLGeometryProcessor.h" 26 #include "glsl/GrGLSLProgramDataManager.h" 27 #include "glsl/GrGLSLUniformHandler.h" 28 #include "glsl/GrGLSLVarying.h" 29 #include "glsl/GrGLSLVertexShaderBuilder.h" 30 31 /////////////////////////////////////////////////////////////////////////////// 32 33 // Returns whether or not the gpu can fast path the dash line effect. 34 bool GrDashingEffect::CanDrawDashLine(const SkPoint pts[2], const GrStrokeInfo& strokeInfo, 35 const SkMatrix& viewMatrix) { 36 // Pts must be either horizontal or vertical in src space 37 if (pts[0].fX != pts[1].fX && pts[0].fY != pts[1].fY) { 38 return false; 39 } 40 41 // May be able to relax this to include skew. As of now cannot do perspective 42 // because of the non uniform scaling of bloating a rect 43 if (!viewMatrix.preservesRightAngles()) { 44 return false; 45 } 46 47 if (!strokeInfo.isDashed() || 2 != strokeInfo.getDashCount()) { 48 return false; 49 } 50 51 const SkScalar* intervals = strokeInfo.getDashIntervals(); 52 if (0 == intervals[0] && 0 == intervals[1]) { 53 return false; 54 } 55 56 SkPaint::Cap cap = strokeInfo.getCap(); 57 // Current we do don't handle Round or Square cap dashes 58 if (SkPaint::kRound_Cap == cap && intervals[0] != 0.f) { 59 return false; 60 } 61 62 return true; 63 } 64 65 namespace { 66 struct DashLineVertex { 67 SkPoint fPos; 68 SkPoint fDashPos; 69 SkScalar fIntervalLength; 70 SkRect fRect; 71 }; 72 struct DashCircleVertex { 73 SkPoint fPos; 74 SkPoint fDashPos; 75 SkScalar fIntervalLength; 76 SkScalar fRadius; 77 SkScalar fCenterX; 78 }; 79 80 enum DashAAMode { 81 kBW_DashAAMode, 82 kEdgeAA_DashAAMode, 83 kMSAA_DashAAMode, 84 85 kDashAAModeCount, 86 }; 87 }; 88 89 static void calc_dash_scaling(SkScalar* parallelScale, SkScalar* perpScale, 90 const SkMatrix& viewMatrix, const SkPoint pts[2]) { 91 SkVector vecSrc = pts[1] - pts[0]; 92 SkScalar magSrc = vecSrc.length(); 93 SkScalar invSrc = magSrc ? SkScalarInvert(magSrc) : 0; 94 vecSrc.scale(invSrc); 95 96 SkVector vecSrcPerp; 97 vecSrc.rotateCW(&vecSrcPerp); 98 viewMatrix.mapVectors(&vecSrc, 1); 99 viewMatrix.mapVectors(&vecSrcPerp, 1); 100 101 // parallelScale tells how much to scale along the line parallel to the dash line 102 // perpScale tells how much to scale in the direction perpendicular to the dash line 103 *parallelScale = vecSrc.length(); 104 *perpScale = vecSrcPerp.length(); 105 } 106 107 // calculates the rotation needed to aligned pts to the x axis with pts[0] < pts[1] 108 // Stores the rotation matrix in rotMatrix, and the mapped points in ptsRot 109 static void align_to_x_axis(const SkPoint pts[2], SkMatrix* rotMatrix, SkPoint ptsRot[2] = nullptr) { 110 SkVector vec = pts[1] - pts[0]; 111 SkScalar mag = vec.length(); 112 SkScalar inv = mag ? SkScalarInvert(mag) : 0; 113 114 vec.scale(inv); 115 rotMatrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); 116 if (ptsRot) { 117 rotMatrix->mapPoints(ptsRot, pts, 2); 118 // correction for numerical issues if map doesn't make ptsRot exactly horizontal 119 ptsRot[1].fY = pts[0].fY; 120 } 121 } 122 123 // Assumes phase < sum of all intervals 124 static SkScalar calc_start_adjustment(const SkScalar intervals[2], SkScalar phase) { 125 SkASSERT(phase < intervals[0] + intervals[1]); 126 if (phase >= intervals[0] && phase != 0) { 127 SkScalar srcIntervalLen = intervals[0] + intervals[1]; 128 return srcIntervalLen - phase; 129 } 130 return 0; 131 } 132 133 static SkScalar calc_end_adjustment(const SkScalar intervals[2], const SkPoint pts[2], 134 SkScalar phase, SkScalar* endingInt) { 135 if (pts[1].fX <= pts[0].fX) { 136 return 0; 137 } 138 SkScalar srcIntervalLen = intervals[0] + intervals[1]; 139 SkScalar totalLen = pts[1].fX - pts[0].fX; 140 SkScalar temp = totalLen / srcIntervalLen; 141 SkScalar numFullIntervals = SkScalarFloorToScalar(temp); 142 *endingInt = totalLen - numFullIntervals * srcIntervalLen + phase; 143 temp = *endingInt / srcIntervalLen; 144 *endingInt = *endingInt - SkScalarFloorToScalar(temp) * srcIntervalLen; 145 if (0 == *endingInt) { 146 *endingInt = srcIntervalLen; 147 } 148 if (*endingInt > intervals[0]) { 149 if (0 == intervals[0]) { 150 *endingInt -= 0.01f; // make sure we capture the last zero size pnt (used if has caps) 151 } 152 return *endingInt - intervals[0]; 153 } 154 return 0; 155 } 156 157 enum DashCap { 158 kRound_DashCap, 159 kNonRound_DashCap, 160 }; 161 162 static int kDashVertices = 4; 163 164 template <typename T> 165 void setup_dashed_rect_common(const SkRect& rect, const SkMatrix& matrix, T* vertices, int idx, 166 SkScalar offset, SkScalar bloatX, SkScalar bloatY, SkScalar len, 167 SkScalar stroke) { 168 SkScalar startDashX = offset - bloatX; 169 SkScalar endDashX = offset + len + bloatX; 170 SkScalar startDashY = -stroke - bloatY; 171 SkScalar endDashY = stroke + bloatY; 172 vertices[idx].fDashPos = SkPoint::Make(startDashX , startDashY); 173 vertices[idx + 1].fDashPos = SkPoint::Make(startDashX, endDashY); 174 vertices[idx + 2].fDashPos = SkPoint::Make(endDashX, endDashY); 175 vertices[idx + 3].fDashPos = SkPoint::Make(endDashX, startDashY); 176 177 vertices[idx].fPos = SkPoint::Make(rect.fLeft, rect.fTop); 178 vertices[idx + 1].fPos = SkPoint::Make(rect.fLeft, rect.fBottom); 179 vertices[idx + 2].fPos = SkPoint::Make(rect.fRight, rect.fBottom); 180 vertices[idx + 3].fPos = SkPoint::Make(rect.fRight, rect.fTop); 181 182 matrix.mapPointsWithStride(&vertices[idx].fPos, sizeof(T), 4); 183 } 184 185 static void setup_dashed_rect(const SkRect& rect, void* vertices, int idx, 186 const SkMatrix& matrix, SkScalar offset, SkScalar bloatX, 187 SkScalar bloatY, SkScalar len, SkScalar stroke, 188 SkScalar startInterval, SkScalar endInterval, SkScalar strokeWidth, 189 DashCap cap, const size_t vertexStride) { 190 SkScalar intervalLength = startInterval + endInterval; 191 192 if (kRound_DashCap == cap) { 193 SkASSERT(vertexStride == sizeof(DashCircleVertex)); 194 DashCircleVertex* verts = reinterpret_cast<DashCircleVertex*>(vertices); 195 196 setup_dashed_rect_common<DashCircleVertex>(rect, matrix, verts, idx, offset, bloatX, 197 bloatY, len, stroke); 198 199 SkScalar radius = SkScalarHalf(strokeWidth) - 0.5f; 200 SkScalar centerX = SkScalarHalf(endInterval); 201 202 for (int i = 0; i < kDashVertices; i++) { 203 verts[idx + i].fIntervalLength = intervalLength; 204 verts[idx + i].fRadius = radius; 205 verts[idx + i].fCenterX = centerX; 206 } 207 208 } else { 209 SkASSERT(kNonRound_DashCap == cap && vertexStride == sizeof(DashLineVertex)); 210 DashLineVertex* verts = reinterpret_cast<DashLineVertex*>(vertices); 211 212 setup_dashed_rect_common<DashLineVertex>(rect, matrix, verts, idx, offset, bloatX, 213 bloatY, len, stroke); 214 215 SkScalar halfOffLen = SkScalarHalf(endInterval); 216 SkScalar halfStroke = SkScalarHalf(strokeWidth); 217 SkRect rectParam; 218 rectParam.set(halfOffLen + 0.5f, -halfStroke + 0.5f, 219 halfOffLen + startInterval - 0.5f, halfStroke - 0.5f); 220 for (int i = 0; i < kDashVertices; i++) { 221 verts[idx + i].fIntervalLength = intervalLength; 222 verts[idx + i].fRect = rectParam; 223 } 224 } 225 } 226 227 static void setup_dashed_rect_pos(const SkRect& rect, int idx, const SkMatrix& matrix, 228 SkPoint* verts) { 229 verts[idx] = SkPoint::Make(rect.fLeft, rect.fTop); 230 verts[idx + 1] = SkPoint::Make(rect.fLeft, rect.fBottom); 231 verts[idx + 2] = SkPoint::Make(rect.fRight, rect.fBottom); 232 verts[idx + 3] = SkPoint::Make(rect.fRight, rect.fTop); 233 matrix.mapPoints(&verts[idx], 4); 234 } 235 236 237 /** 238 * An GrGeometryProcessor that renders a dashed line. 239 * This GrGeometryProcessor is meant for dashed lines that only have a single on/off interval pair. 240 * Bounding geometry is rendered and the effect computes coverage based on the fragment's 241 * position relative to the dashed line. 242 */ 243 static GrGeometryProcessor* create_dash_gp(GrColor, 244 DashAAMode aaMode, 245 DashCap cap, 246 const SkMatrix& localMatrix, 247 bool usesLocalCoords); 248 249 class DashBatch : public GrVertexBatch { 250 public: 251 DEFINE_BATCH_CLASS_ID 252 253 struct Geometry { 254 SkMatrix fViewMatrix; 255 SkMatrix fSrcRotInv; 256 SkPoint fPtsRot[2]; 257 SkScalar fSrcStrokeWidth; 258 SkScalar fPhase; 259 SkScalar fIntervals[2]; 260 SkScalar fParallelScale; 261 SkScalar fPerpendicularScale; 262 GrColor fColor; 263 }; 264 265 static GrDrawBatch* Create(const Geometry& geometry, SkPaint::Cap cap, DashAAMode aaMode, 266 bool fullDash) { 267 return new DashBatch(geometry, cap, aaMode, fullDash); 268 } 269 270 const char* name() const override { return "DashBatch"; } 271 272 void computePipelineOptimizations(GrInitInvariantOutput* color, 273 GrInitInvariantOutput* coverage, 274 GrBatchToXPOverrides* overrides) const override { 275 // When this is called on a batch, there is only one geometry bundle 276 color->setKnownFourComponents(fGeoData[0].fColor); 277 coverage->setUnknownSingleComponent(); 278 } 279 280 SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; } 281 282 private: 283 DashBatch(const Geometry& geometry, SkPaint::Cap cap, DashAAMode aaMode, bool fullDash) 284 : INHERITED(ClassID()) { 285 fGeoData.push_back(geometry); 286 287 fBatch.fAAMode = aaMode; 288 fBatch.fCap = cap; 289 fBatch.fFullDash = fullDash; 290 291 // compute bounds 292 SkScalar halfStrokeWidth = 0.5f * geometry.fSrcStrokeWidth; 293 SkScalar xBloat = SkPaint::kButt_Cap == cap ? 0 : halfStrokeWidth; 294 fBounds.set(geometry.fPtsRot[0], geometry.fPtsRot[1]); 295 fBounds.outset(xBloat, halfStrokeWidth); 296 297 // Note, we actually create the combined matrix here, and save the work 298 SkMatrix& combinedMatrix = fGeoData[0].fSrcRotInv; 299 combinedMatrix.postConcat(geometry.fViewMatrix); 300 combinedMatrix.mapRect(&fBounds); 301 } 302 303 void initBatchTracker(const GrXPOverridesForBatch& overrides) override { 304 // Handle any color overrides 305 if (!overrides.readsColor()) { 306 fGeoData[0].fColor = GrColor_ILLEGAL; 307 } 308 overrides.getOverrideColorIfSet(&fGeoData[0].fColor); 309 310 // setup batch properties 311 fBatch.fColorIgnored = !overrides.readsColor(); 312 fBatch.fColor = fGeoData[0].fColor; 313 fBatch.fUsesLocalCoords = overrides.readsLocalCoords(); 314 fBatch.fCoverageIgnored = !overrides.readsCoverage(); 315 } 316 317 struct DashDraw { 318 DashDraw(const Geometry& geo) { 319 memcpy(fPtsRot, geo.fPtsRot, sizeof(geo.fPtsRot)); 320 memcpy(fIntervals, geo.fIntervals, sizeof(geo.fIntervals)); 321 fPhase = geo.fPhase; 322 } 323 SkPoint fPtsRot[2]; 324 SkScalar fIntervals[2]; 325 SkScalar fPhase; 326 SkScalar fStartOffset; 327 SkScalar fStrokeWidth; 328 SkScalar fLineLength; 329 SkScalar fHalfDevStroke; 330 SkScalar fDevBloatX; 331 SkScalar fDevBloatY; 332 bool fLineDone; 333 bool fHasStartRect; 334 bool fHasEndRect; 335 }; 336 337 void onPrepareDraws(Target* target) const override { 338 int instanceCount = fGeoData.count(); 339 SkPaint::Cap cap = this->cap(); 340 bool isRoundCap = SkPaint::kRound_Cap == cap; 341 DashCap capType = isRoundCap ? kRound_DashCap : kNonRound_DashCap; 342 343 SkAutoTUnref<const GrGeometryProcessor> gp; 344 if (this->fullDash()) { 345 gp.reset(create_dash_gp(this->color(), this->aaMode(), capType, this->viewMatrix(), 346 this->usesLocalCoords())); 347 } else { 348 // Set up the vertex data for the line and start/end dashes 349 using namespace GrDefaultGeoProcFactory; 350 Color color(this->color()); 351 Coverage coverage(this->coverageIgnored() ? Coverage::kNone_Type : 352 Coverage::kSolid_Type); 353 LocalCoords localCoords(this->usesLocalCoords() ? LocalCoords::kUsePosition_Type : 354 LocalCoords::kUnused_Type); 355 gp.reset(CreateForDeviceSpace(color, coverage, localCoords, this->viewMatrix())); 356 } 357 358 if (!gp) { 359 SkDebugf("Could not create GrGeometryProcessor\n"); 360 return; 361 } 362 363 target->initDraw(gp, this->pipeline()); 364 365 // useAA here means Edge AA or MSAA 366 bool useAA = this->aaMode() != kBW_DashAAMode; 367 bool fullDash = this->fullDash(); 368 369 // We do two passes over all of the dashes. First we setup the start, end, and bounds, 370 // rectangles. We preserve all of this work in the rects / draws arrays below. Then we 371 // iterate again over these decomposed dashes to generate vertices 372 static const int kNumStackDashes = 128; 373 SkSTArray<kNumStackDashes, SkRect, true> rects; 374 SkSTArray<kNumStackDashes, DashDraw, true> draws; 375 376 int totalRectCount = 0; 377 int rectOffset = 0; 378 rects.push_back_n(3 * instanceCount); 379 for (int i = 0; i < instanceCount; i++) { 380 const Geometry& args = fGeoData[i]; 381 382 DashDraw& draw = draws.push_back(args); 383 384 bool hasCap = SkPaint::kButt_Cap != cap && 0 != args.fSrcStrokeWidth; 385 386 // We always want to at least stroke out half a pixel on each side in device space 387 // so 0.5f / perpScale gives us this min in src space 388 SkScalar halfSrcStroke = 389 SkMaxScalar(args.fSrcStrokeWidth * 0.5f, 0.5f / args.fPerpendicularScale); 390 391 SkScalar strokeAdj; 392 if (!hasCap) { 393 strokeAdj = 0.f; 394 } else { 395 strokeAdj = halfSrcStroke; 396 } 397 398 SkScalar startAdj = 0; 399 400 bool lineDone = false; 401 402 // Too simplify the algorithm, we always push back rects for start and end rect. 403 // Otherwise we'd have to track start / end rects for each individual geometry 404 SkRect& bounds = rects[rectOffset++]; 405 SkRect& startRect = rects[rectOffset++]; 406 SkRect& endRect = rects[rectOffset++]; 407 408 bool hasStartRect = false; 409 // If we are using AA, check to see if we are drawing a partial dash at the start. If so 410 // draw it separately here and adjust our start point accordingly 411 if (useAA) { 412 if (draw.fPhase > 0 && draw.fPhase < draw.fIntervals[0]) { 413 SkPoint startPts[2]; 414 startPts[0] = draw.fPtsRot[0]; 415 startPts[1].fY = startPts[0].fY; 416 startPts[1].fX = SkMinScalar(startPts[0].fX + draw.fIntervals[0] - draw.fPhase, 417 draw.fPtsRot[1].fX); 418 startRect.set(startPts, 2); 419 startRect.outset(strokeAdj, halfSrcStroke); 420 421 hasStartRect = true; 422 startAdj = draw.fIntervals[0] + draw.fIntervals[1] - draw.fPhase; 423 } 424 } 425 426 // adjustments for start and end of bounding rect so we only draw dash intervals 427 // contained in the original line segment. 428 startAdj += calc_start_adjustment(draw.fIntervals, draw.fPhase); 429 if (startAdj != 0) { 430 draw.fPtsRot[0].fX += startAdj; 431 draw.fPhase = 0; 432 } 433 SkScalar endingInterval = 0; 434 SkScalar endAdj = calc_end_adjustment(draw.fIntervals, draw.fPtsRot, draw.fPhase, 435 &endingInterval); 436 draw.fPtsRot[1].fX -= endAdj; 437 if (draw.fPtsRot[0].fX >= draw.fPtsRot[1].fX) { 438 lineDone = true; 439 } 440 441 bool hasEndRect = false; 442 // If we are using AA, check to see if we are drawing a partial dash at then end. If so 443 // draw it separately here and adjust our end point accordingly 444 if (useAA && !lineDone) { 445 // If we adjusted the end then we will not be drawing a partial dash at the end. 446 // If we didn't adjust the end point then we just need to make sure the ending 447 // dash isn't a full dash 448 if (0 == endAdj && endingInterval != draw.fIntervals[0]) { 449 SkPoint endPts[2]; 450 endPts[1] = draw.fPtsRot[1]; 451 endPts[0].fY = endPts[1].fY; 452 endPts[0].fX = endPts[1].fX - endingInterval; 453 454 endRect.set(endPts, 2); 455 endRect.outset(strokeAdj, halfSrcStroke); 456 457 hasEndRect = true; 458 endAdj = endingInterval + draw.fIntervals[1]; 459 460 draw.fPtsRot[1].fX -= endAdj; 461 if (draw.fPtsRot[0].fX >= draw.fPtsRot[1].fX) { 462 lineDone = true; 463 } 464 } 465 } 466 467 if (startAdj != 0) { 468 draw.fPhase = 0; 469 } 470 471 // Change the dashing info from src space into device space 472 SkScalar* devIntervals = draw.fIntervals; 473 devIntervals[0] = draw.fIntervals[0] * args.fParallelScale; 474 devIntervals[1] = draw.fIntervals[1] * args.fParallelScale; 475 SkScalar devPhase = draw.fPhase * args.fParallelScale; 476 SkScalar strokeWidth = args.fSrcStrokeWidth * args.fPerpendicularScale; 477 478 if ((strokeWidth < 1.f && useAA) || 0.f == strokeWidth) { 479 strokeWidth = 1.f; 480 } 481 482 SkScalar halfDevStroke = strokeWidth * 0.5f; 483 484 if (SkPaint::kSquare_Cap == cap && 0 != args.fSrcStrokeWidth) { 485 // add cap to on interval and remove from off interval 486 devIntervals[0] += strokeWidth; 487 devIntervals[1] -= strokeWidth; 488 } 489 SkScalar startOffset = devIntervals[1] * 0.5f + devPhase; 490 491 // For EdgeAA, we bloat in X & Y for both square and round caps. 492 // For MSAA, we don't bloat at all for square caps, and bloat in Y only for round caps. 493 SkScalar devBloatX = this->aaMode() == kEdgeAA_DashAAMode ? 0.5f : 0.0f; 494 SkScalar devBloatY = (SkPaint::kRound_Cap == cap && this->aaMode() == kMSAA_DashAAMode) 495 ? 0.5f : devBloatX; 496 497 SkScalar bloatX = devBloatX / args.fParallelScale; 498 SkScalar bloatY = devBloatY / args.fPerpendicularScale; 499 500 if (devIntervals[1] <= 0.f && useAA) { 501 // Case when we end up drawing a solid AA rect 502 // Reset the start rect to draw this single solid rect 503 // but it requires to upload a new intervals uniform so we can mimic 504 // one giant dash 505 draw.fPtsRot[0].fX -= hasStartRect ? startAdj : 0; 506 draw.fPtsRot[1].fX += hasEndRect ? endAdj : 0; 507 startRect.set(draw.fPtsRot, 2); 508 startRect.outset(strokeAdj, halfSrcStroke); 509 hasStartRect = true; 510 hasEndRect = false; 511 lineDone = true; 512 513 SkPoint devicePts[2]; 514 args.fViewMatrix.mapPoints(devicePts, draw.fPtsRot, 2); 515 SkScalar lineLength = SkPoint::Distance(devicePts[0], devicePts[1]); 516 if (hasCap) { 517 lineLength += 2.f * halfDevStroke; 518 } 519 devIntervals[0] = lineLength; 520 } 521 522 totalRectCount += !lineDone ? 1 : 0; 523 totalRectCount += hasStartRect ? 1 : 0; 524 totalRectCount += hasEndRect ? 1 : 0; 525 526 if (SkPaint::kRound_Cap == cap && 0 != args.fSrcStrokeWidth) { 527 // need to adjust this for round caps to correctly set the dashPos attrib on 528 // vertices 529 startOffset -= halfDevStroke; 530 } 531 532 if (!lineDone) { 533 SkPoint devicePts[2]; 534 args.fViewMatrix.mapPoints(devicePts, draw.fPtsRot, 2); 535 draw.fLineLength = SkPoint::Distance(devicePts[0], devicePts[1]); 536 if (hasCap) { 537 draw.fLineLength += 2.f * halfDevStroke; 538 } 539 540 bounds.set(draw.fPtsRot[0].fX, draw.fPtsRot[0].fY, 541 draw.fPtsRot[1].fX, draw.fPtsRot[1].fY); 542 bounds.outset(bloatX + strokeAdj, bloatY + halfSrcStroke); 543 } 544 545 if (hasStartRect) { 546 SkASSERT(useAA); // so that we know bloatX and bloatY have been set 547 startRect.outset(bloatX, bloatY); 548 } 549 550 if (hasEndRect) { 551 SkASSERT(useAA); // so that we know bloatX and bloatY have been set 552 endRect.outset(bloatX, bloatY); 553 } 554 555 draw.fStartOffset = startOffset; 556 draw.fDevBloatX = devBloatX; 557 draw.fDevBloatY = devBloatY; 558 draw.fHalfDevStroke = halfDevStroke; 559 draw.fStrokeWidth = strokeWidth; 560 draw.fHasStartRect = hasStartRect; 561 draw.fLineDone = lineDone; 562 draw.fHasEndRect = hasEndRect; 563 } 564 565 if (!totalRectCount) { 566 return; 567 } 568 569 QuadHelper helper; 570 void* vertices = helper.init(target, gp->getVertexStride(), totalRectCount); 571 if (!vertices) { 572 return; 573 } 574 575 int curVIdx = 0; 576 int rectIndex = 0; 577 for (int i = 0; i < instanceCount; i++) { 578 const Geometry& geom = fGeoData[i]; 579 580 if (!draws[i].fLineDone) { 581 if (fullDash) { 582 setup_dashed_rect(rects[rectIndex], vertices, curVIdx, geom.fSrcRotInv, 583 draws[i].fStartOffset, draws[i].fDevBloatX, 584 draws[i].fDevBloatY, draws[i].fLineLength, 585 draws[i].fHalfDevStroke, draws[i].fIntervals[0], 586 draws[i].fIntervals[1], draws[i].fStrokeWidth, 587 capType, gp->getVertexStride()); 588 } else { 589 SkPoint* verts = reinterpret_cast<SkPoint*>(vertices); 590 SkASSERT(gp->getVertexStride() == sizeof(SkPoint)); 591 setup_dashed_rect_pos(rects[rectIndex], curVIdx, geom.fSrcRotInv, verts); 592 } 593 curVIdx += 4; 594 } 595 rectIndex++; 596 597 if (draws[i].fHasStartRect) { 598 if (fullDash) { 599 setup_dashed_rect(rects[rectIndex], vertices, curVIdx, geom.fSrcRotInv, 600 draws[i].fStartOffset, draws[i].fDevBloatX, 601 draws[i].fDevBloatY, draws[i].fIntervals[0], 602 draws[i].fHalfDevStroke, draws[i].fIntervals[0], 603 draws[i].fIntervals[1], draws[i].fStrokeWidth, capType, 604 gp->getVertexStride()); 605 } else { 606 SkPoint* verts = reinterpret_cast<SkPoint*>(vertices); 607 SkASSERT(gp->getVertexStride() == sizeof(SkPoint)); 608 setup_dashed_rect_pos(rects[rectIndex], curVIdx, geom.fSrcRotInv, verts); 609 } 610 curVIdx += 4; 611 } 612 rectIndex++; 613 614 if (draws[i].fHasEndRect) { 615 if (fullDash) { 616 setup_dashed_rect(rects[rectIndex], vertices, curVIdx, geom.fSrcRotInv, 617 draws[i].fStartOffset, draws[i].fDevBloatX, 618 draws[i].fDevBloatY, draws[i].fIntervals[0], 619 draws[i].fHalfDevStroke, draws[i].fIntervals[0], 620 draws[i].fIntervals[1], draws[i].fStrokeWidth, capType, 621 gp->getVertexStride()); 622 } else { 623 SkPoint* verts = reinterpret_cast<SkPoint*>(vertices); 624 SkASSERT(gp->getVertexStride() == sizeof(SkPoint)); 625 setup_dashed_rect_pos(rects[rectIndex], curVIdx, geom.fSrcRotInv, verts); 626 } 627 curVIdx += 4; 628 } 629 rectIndex++; 630 } 631 SkASSERT(0 == (curVIdx % 4) && (curVIdx / 4) == totalRectCount); 632 helper.recordDraw(target); 633 } 634 635 bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override { 636 DashBatch* that = t->cast<DashBatch>(); 637 if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *that->pipeline(), 638 that->bounds(), caps)) { 639 return false; 640 } 641 642 if (this->aaMode() != that->aaMode()) { 643 return false; 644 } 645 646 if (this->fullDash() != that->fullDash()) { 647 return false; 648 } 649 650 if (this->cap() != that->cap()) { 651 return false; 652 } 653 654 // TODO vertex color 655 if (this->color() != that->color()) { 656 return false; 657 } 658 659 SkASSERT(this->usesLocalCoords() == that->usesLocalCoords()); 660 if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) { 661 return false; 662 } 663 664 fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin()); 665 this->joinBounds(that->bounds()); 666 return true; 667 } 668 669 GrColor color() const { return fBatch.fColor; } 670 bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; } 671 const SkMatrix& viewMatrix() const { return fGeoData[0].fViewMatrix; } 672 DashAAMode aaMode() const { return fBatch.fAAMode; } 673 bool fullDash() const { return fBatch.fFullDash; } 674 SkPaint::Cap cap() const { return fBatch.fCap; } 675 bool coverageIgnored() const { return fBatch.fCoverageIgnored; } 676 677 struct BatchTracker { 678 GrColor fColor; 679 bool fUsesLocalCoords; 680 bool fColorIgnored; 681 bool fCoverageIgnored; 682 SkPaint::Cap fCap; 683 DashAAMode fAAMode; 684 bool fFullDash; 685 }; 686 687 static const int kVertsPerDash = 4; 688 static const int kIndicesPerDash = 6; 689 690 BatchTracker fBatch; 691 SkSTArray<1, Geometry, true> fGeoData; 692 693 typedef GrVertexBatch INHERITED; 694 }; 695 696 static GrDrawBatch* create_batch(GrColor color, const SkMatrix& viewMatrix, const SkPoint pts[2], 697 bool useAA, const GrStrokeInfo& strokeInfo, bool msaaRT) { 698 const SkScalar* intervals = strokeInfo.getDashIntervals(); 699 SkScalar phase = strokeInfo.getDashPhase(); 700 701 SkPaint::Cap cap = strokeInfo.getCap(); 702 703 DashBatch::Geometry geometry; 704 geometry.fSrcStrokeWidth = strokeInfo.getWidth(); 705 706 // the phase should be normalized to be [0, sum of all intervals) 707 SkASSERT(phase >= 0 && phase < intervals[0] + intervals[1]); 708 709 // Rotate the src pts so they are aligned horizontally with pts[0].fX < pts[1].fX 710 if (pts[0].fY != pts[1].fY || pts[0].fX > pts[1].fX) { 711 SkMatrix rotMatrix; 712 align_to_x_axis(pts, &rotMatrix, geometry.fPtsRot); 713 if(!rotMatrix.invert(&geometry.fSrcRotInv)) { 714 SkDebugf("Failed to create invertible rotation matrix!\n"); 715 return nullptr; 716 } 717 } else { 718 geometry.fSrcRotInv.reset(); 719 memcpy(geometry.fPtsRot, pts, 2 * sizeof(SkPoint)); 720 } 721 722 // Scale corrections of intervals and stroke from view matrix 723 calc_dash_scaling(&geometry.fParallelScale, &geometry.fPerpendicularScale, viewMatrix, 724 geometry.fPtsRot); 725 726 SkScalar offInterval = intervals[1] * geometry.fParallelScale; 727 SkScalar strokeWidth = geometry.fSrcStrokeWidth * geometry.fPerpendicularScale; 728 729 if (SkPaint::kSquare_Cap == cap && 0 != geometry.fSrcStrokeWidth) { 730 // add cap to on interveal and remove from off interval 731 offInterval -= strokeWidth; 732 } 733 734 DashAAMode aaMode = msaaRT ? kMSAA_DashAAMode : 735 useAA ? kEdgeAA_DashAAMode : kBW_DashAAMode; 736 737 // TODO we can do a real rect call if not using fulldash(ie no off interval, not using AA) 738 bool fullDash = offInterval > 0.f || aaMode != kBW_DashAAMode; 739 740 geometry.fColor = color; 741 geometry.fViewMatrix = viewMatrix; 742 geometry.fPhase = phase; 743 geometry.fIntervals[0] = intervals[0]; 744 geometry.fIntervals[1] = intervals[1]; 745 746 return DashBatch::Create(geometry, cap, aaMode, fullDash); 747 } 748 749 bool GrDashingEffect::DrawDashLine(GrDrawTarget* target, 750 const GrPipelineBuilder& pipelineBuilder, GrColor color, 751 const SkMatrix& viewMatrix, const SkPoint pts[2], 752 bool useAA, const GrStrokeInfo& strokeInfo) { 753 SkAutoTUnref<GrDrawBatch> batch( 754 create_batch(color, viewMatrix, pts, useAA, strokeInfo, 755 pipelineBuilder.getRenderTarget()->isUnifiedMultisampled())); 756 if (!batch) { 757 return false; 758 } 759 760 target->drawBatch(pipelineBuilder, batch); 761 return true; 762 } 763 764 ////////////////////////////////////////////////////////////////////////////// 765 766 class GLDashingCircleEffect; 767 768 /* 769 * This effect will draw a dotted line (defined as a dashed lined with round caps and no on 770 * interval). The radius of the dots is given by the strokeWidth and the spacing by the DashInfo. 771 * Both of the previous two parameters are in device space. This effect also requires the setting of 772 * a vec2 vertex attribute for the the four corners of the bounding rect. This attribute is the 773 * "dash position" of each vertex. In other words it is the vertex coords (in device space) if we 774 * transform the line to be horizontal, with the start of line at the origin then shifted to the 775 * right by half the off interval. The line then goes in the positive x direction. 776 */ 777 class DashingCircleEffect : public GrGeometryProcessor { 778 public: 779 typedef SkPathEffect::DashInfo DashInfo; 780 781 static GrGeometryProcessor* Create(GrColor, 782 DashAAMode aaMode, 783 const SkMatrix& localMatrix, 784 bool usesLocalCoords); 785 786 const char* name() const override { return "DashingCircleEffect"; } 787 788 const Attribute* inPosition() const { return fInPosition; } 789 790 const Attribute* inDashParams() const { return fInDashParams; } 791 792 const Attribute* inCircleParams() const { return fInCircleParams; } 793 794 DashAAMode aaMode() const { return fAAMode; } 795 796 GrColor color() const { return fColor; } 797 798 bool colorIgnored() const { return GrColor_ILLEGAL == fColor; } 799 800 const SkMatrix& localMatrix() const { return fLocalMatrix; } 801 802 bool usesLocalCoords() const { return fUsesLocalCoords; } 803 804 void getGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder* b) const override; 805 806 GrGLSLPrimitiveProcessor* createGLSLInstance(const GrGLSLCaps&) const override; 807 808 private: 809 DashingCircleEffect(GrColor, DashAAMode aaMode, const SkMatrix& localMatrix, 810 bool usesLocalCoords); 811 812 GrColor fColor; 813 SkMatrix fLocalMatrix; 814 bool fUsesLocalCoords; 815 DashAAMode fAAMode; 816 const Attribute* fInPosition; 817 const Attribute* fInDashParams; 818 const Attribute* fInCircleParams; 819 820 GR_DECLARE_GEOMETRY_PROCESSOR_TEST; 821 822 typedef GrGeometryProcessor INHERITED; 823 }; 824 825 ////////////////////////////////////////////////////////////////////////////// 826 827 class GLDashingCircleEffect : public GrGLSLGeometryProcessor { 828 public: 829 GLDashingCircleEffect(); 830 831 void onEmitCode(EmitArgs&, GrGPArgs*) override; 832 833 static inline void GenKey(const GrGeometryProcessor&, 834 const GrGLSLCaps&, 835 GrProcessorKeyBuilder*); 836 837 void setData(const GrGLSLProgramDataManager&, const GrPrimitiveProcessor&) override; 838 839 void setTransformData(const GrPrimitiveProcessor& primProc, 840 const GrGLSLProgramDataManager& pdman, 841 int index, 842 const SkTArray<const GrCoordTransform*, true>& transforms) override { 843 this->setTransformDataHelper<DashingCircleEffect>(primProc, pdman, index, transforms); 844 } 845 846 private: 847 UniformHandle fParamUniform; 848 UniformHandle fColorUniform; 849 GrColor fColor; 850 SkScalar fPrevRadius; 851 SkScalar fPrevCenterX; 852 SkScalar fPrevIntervalLength; 853 typedef GrGLSLGeometryProcessor INHERITED; 854 }; 855 856 GLDashingCircleEffect::GLDashingCircleEffect() { 857 fColor = GrColor_ILLEGAL; 858 fPrevRadius = SK_ScalarMin; 859 fPrevCenterX = SK_ScalarMin; 860 fPrevIntervalLength = SK_ScalarMax; 861 } 862 863 void GLDashingCircleEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) { 864 const DashingCircleEffect& dce = args.fGP.cast<DashingCircleEffect>(); 865 GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; 866 GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; 867 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; 868 869 // emit attributes 870 varyingHandler->emitAttributes(dce); 871 872 // XY are dashPos, Z is dashInterval 873 GrGLSLVertToFrag dashParams(kVec3f_GrSLType); 874 varyingHandler->addVarying("DashParam", &dashParams); 875 vertBuilder->codeAppendf("%s = %s;", dashParams.vsOut(), dce.inDashParams()->fName); 876 877 // x refers to circle radius - 0.5, y refers to cicle's center x coord 878 GrGLSLVertToFrag circleParams(kVec2f_GrSLType); 879 varyingHandler->addVarying("CircleParams", &circleParams); 880 vertBuilder->codeAppendf("%s = %s;", circleParams.vsOut(), dce.inCircleParams()->fName); 881 882 GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; 883 // Setup pass through color 884 if (!dce.colorIgnored()) { 885 this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor, &fColorUniform); 886 } 887 888 // Setup position 889 this->setupPosition(vertBuilder, gpArgs, dce.inPosition()->fName); 890 891 // emit transforms 892 this->emitTransforms(vertBuilder, 893 varyingHandler, 894 uniformHandler, 895 gpArgs->fPositionVar, 896 dce.inPosition()->fName, 897 dce.localMatrix(), 898 args.fTransformsIn, 899 args.fTransformsOut); 900 901 // transforms all points so that we can compare them to our test circle 902 fragBuilder->codeAppendf("float xShifted = %s.x - floor(%s.x / %s.z) * %s.z;", 903 dashParams.fsIn(), dashParams.fsIn(), dashParams.fsIn(), 904 dashParams.fsIn()); 905 fragBuilder->codeAppendf("vec2 fragPosShifted = vec2(xShifted, %s.y);", dashParams.fsIn()); 906 fragBuilder->codeAppendf("vec2 center = vec2(%s.y, 0.0);", circleParams.fsIn()); 907 fragBuilder->codeAppend("float dist = length(center - fragPosShifted);"); 908 if (dce.aaMode() != kBW_DashAAMode) { 909 fragBuilder->codeAppendf("float diff = dist - %s.x;", circleParams.fsIn()); 910 fragBuilder->codeAppend("diff = 1.0 - diff;"); 911 fragBuilder->codeAppend("float alpha = clamp(diff, 0.0, 1.0);"); 912 } else { 913 fragBuilder->codeAppendf("float alpha = 1.0;"); 914 fragBuilder->codeAppendf("alpha *= dist < %s.x + 0.5 ? 1.0 : 0.0;", circleParams.fsIn()); 915 } 916 fragBuilder->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage); 917 } 918 919 void GLDashingCircleEffect::setData(const GrGLSLProgramDataManager& pdman, 920 const GrPrimitiveProcessor& processor) { 921 const DashingCircleEffect& dce = processor.cast<DashingCircleEffect>(); 922 if (dce.color() != fColor) { 923 float c[4]; 924 GrColorToRGBAFloat(dce.color(), c); 925 pdman.set4fv(fColorUniform, 1, c); 926 fColor = dce.color(); 927 } 928 } 929 930 void GLDashingCircleEffect::GenKey(const GrGeometryProcessor& gp, 931 const GrGLSLCaps&, 932 GrProcessorKeyBuilder* b) { 933 const DashingCircleEffect& dce = gp.cast<DashingCircleEffect>(); 934 uint32_t key = 0; 935 key |= dce.usesLocalCoords() && dce.localMatrix().hasPerspective() ? 0x1 : 0x0; 936 key |= dce.colorIgnored() ? 0x2 : 0x0; 937 key |= dce.aaMode() << 8; 938 b->add32(key); 939 } 940 941 ////////////////////////////////////////////////////////////////////////////// 942 943 GrGeometryProcessor* DashingCircleEffect::Create(GrColor color, 944 DashAAMode aaMode, 945 const SkMatrix& localMatrix, 946 bool usesLocalCoords) { 947 return new DashingCircleEffect(color, aaMode, localMatrix, usesLocalCoords); 948 } 949 950 void DashingCircleEffect::getGLSLProcessorKey(const GrGLSLCaps& caps, 951 GrProcessorKeyBuilder* b) const { 952 GLDashingCircleEffect::GenKey(*this, caps, b); 953 } 954 955 GrGLSLPrimitiveProcessor* DashingCircleEffect::createGLSLInstance(const GrGLSLCaps&) const { 956 return new GLDashingCircleEffect(); 957 } 958 959 DashingCircleEffect::DashingCircleEffect(GrColor color, 960 DashAAMode aaMode, 961 const SkMatrix& localMatrix, 962 bool usesLocalCoords) 963 : fColor(color) 964 , fLocalMatrix(localMatrix) 965 , fUsesLocalCoords(usesLocalCoords) 966 , fAAMode(aaMode) { 967 this->initClassID<DashingCircleEffect>(); 968 fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); 969 fInDashParams = &this->addVertexAttrib(Attribute("inDashParams", kVec3f_GrVertexAttribType)); 970 fInCircleParams = &this->addVertexAttrib(Attribute("inCircleParams", 971 kVec2f_GrVertexAttribType)); 972 } 973 974 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DashingCircleEffect); 975 976 const GrGeometryProcessor* DashingCircleEffect::TestCreate(GrProcessorTestData* d) { 977 DashAAMode aaMode = static_cast<DashAAMode>(d->fRandom->nextULessThan(kDashAAModeCount)); 978 return DashingCircleEffect::Create(GrRandomColor(d->fRandom), 979 aaMode, GrTest::TestMatrix(d->fRandom), 980 d->fRandom->nextBool()); 981 } 982 983 ////////////////////////////////////////////////////////////////////////////// 984 985 class GLDashingLineEffect; 986 987 /* 988 * This effect will draw a dashed line. The width of the dash is given by the strokeWidth and the 989 * length and spacing by the DashInfo. Both of the previous two parameters are in device space. 990 * This effect also requires the setting of a vec2 vertex attribute for the the four corners of the 991 * bounding rect. This attribute is the "dash position" of each vertex. In other words it is the 992 * vertex coords (in device space) if we transform the line to be horizontal, with the start of 993 * line at the origin then shifted to the right by half the off interval. The line then goes in the 994 * positive x direction. 995 */ 996 class DashingLineEffect : public GrGeometryProcessor { 997 public: 998 typedef SkPathEffect::DashInfo DashInfo; 999 1000 static GrGeometryProcessor* Create(GrColor, 1001 DashAAMode aaMode, 1002 const SkMatrix& localMatrix, 1003 bool usesLocalCoords); 1004 1005 const char* name() const override { return "DashingEffect"; } 1006 1007 const Attribute* inPosition() const { return fInPosition; } 1008 1009 const Attribute* inDashParams() const { return fInDashParams; } 1010 1011 const Attribute* inRectParams() const { return fInRectParams; } 1012 1013 DashAAMode aaMode() const { return fAAMode; } 1014 1015 GrColor color() const { return fColor; } 1016 1017 bool colorIgnored() const { return GrColor_ILLEGAL == fColor; } 1018 1019 const SkMatrix& localMatrix() const { return fLocalMatrix; } 1020 1021 bool usesLocalCoords() const { return fUsesLocalCoords; } 1022 1023 void getGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override; 1024 1025 GrGLSLPrimitiveProcessor* createGLSLInstance(const GrGLSLCaps&) const override; 1026 1027 private: 1028 DashingLineEffect(GrColor, DashAAMode aaMode, const SkMatrix& localMatrix, 1029 bool usesLocalCoords); 1030 1031 GrColor fColor; 1032 SkMatrix fLocalMatrix; 1033 bool fUsesLocalCoords; 1034 DashAAMode fAAMode; 1035 const Attribute* fInPosition; 1036 const Attribute* fInDashParams; 1037 const Attribute* fInRectParams; 1038 1039 GR_DECLARE_GEOMETRY_PROCESSOR_TEST; 1040 1041 typedef GrGeometryProcessor INHERITED; 1042 }; 1043 1044 ////////////////////////////////////////////////////////////////////////////// 1045 1046 class GLDashingLineEffect : public GrGLSLGeometryProcessor { 1047 public: 1048 GLDashingLineEffect(); 1049 1050 void onEmitCode(EmitArgs&, GrGPArgs*) override; 1051 1052 static inline void GenKey(const GrGeometryProcessor&, 1053 const GrGLSLCaps&, 1054 GrProcessorKeyBuilder*); 1055 1056 void setData(const GrGLSLProgramDataManager&, const GrPrimitiveProcessor&) override; 1057 1058 void setTransformData(const GrPrimitiveProcessor& primProc, 1059 const GrGLSLProgramDataManager& pdman, 1060 int index, 1061 const SkTArray<const GrCoordTransform*, true>& transforms) override { 1062 this->setTransformDataHelper<DashingLineEffect>(primProc, pdman, index, transforms); 1063 } 1064 1065 private: 1066 GrColor fColor; 1067 UniformHandle fColorUniform; 1068 typedef GrGLSLGeometryProcessor INHERITED; 1069 }; 1070 1071 GLDashingLineEffect::GLDashingLineEffect() { 1072 fColor = GrColor_ILLEGAL; 1073 } 1074 1075 void GLDashingLineEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) { 1076 const DashingLineEffect& de = args.fGP.cast<DashingLineEffect>(); 1077 1078 GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; 1079 GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; 1080 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; 1081 1082 // emit attributes 1083 varyingHandler->emitAttributes(de); 1084 1085 // XY refers to dashPos, Z is the dash interval length 1086 GrGLSLVertToFrag inDashParams(kVec3f_GrSLType); 1087 varyingHandler->addVarying("DashParams", &inDashParams, GrSLPrecision::kHigh_GrSLPrecision); 1088 vertBuilder->codeAppendf("%s = %s;", inDashParams.vsOut(), de.inDashParams()->fName); 1089 1090 // The rect uniform's xyzw refer to (left + 0.5, top + 0.5, right - 0.5, bottom - 0.5), 1091 // respectively. 1092 GrGLSLVertToFrag inRectParams(kVec4f_GrSLType); 1093 varyingHandler->addVarying("RectParams", &inRectParams, GrSLPrecision::kHigh_GrSLPrecision); 1094 vertBuilder->codeAppendf("%s = %s;", inRectParams.vsOut(), de.inRectParams()->fName); 1095 1096 GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; 1097 // Setup pass through color 1098 if (!de.colorIgnored()) { 1099 this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor, &fColorUniform); 1100 } 1101 1102 // Setup position 1103 this->setupPosition(vertBuilder, gpArgs, de.inPosition()->fName); 1104 1105 // emit transforms 1106 this->emitTransforms(vertBuilder, 1107 varyingHandler, 1108 uniformHandler, 1109 gpArgs->fPositionVar, 1110 de.inPosition()->fName, 1111 de.localMatrix(), 1112 args.fTransformsIn, 1113 args.fTransformsOut); 1114 1115 // transforms all points so that we can compare them to our test rect 1116 fragBuilder->codeAppendf("float xShifted = %s.x - floor(%s.x / %s.z) * %s.z;", 1117 inDashParams.fsIn(), inDashParams.fsIn(), inDashParams.fsIn(), 1118 inDashParams.fsIn()); 1119 fragBuilder->codeAppendf("vec2 fragPosShifted = vec2(xShifted, %s.y);", inDashParams.fsIn()); 1120 if (de.aaMode() == kEdgeAA_DashAAMode) { 1121 // The amount of coverage removed in x and y by the edges is computed as a pair of negative 1122 // numbers, xSub and ySub. 1123 fragBuilder->codeAppend("float xSub, ySub;"); 1124 fragBuilder->codeAppendf("xSub = min(fragPosShifted.x - %s.x, 0.0);", inRectParams.fsIn()); 1125 fragBuilder->codeAppendf("xSub += min(%s.z - fragPosShifted.x, 0.0);", inRectParams.fsIn()); 1126 fragBuilder->codeAppendf("ySub = min(fragPosShifted.y - %s.y, 0.0);", inRectParams.fsIn()); 1127 fragBuilder->codeAppendf("ySub += min(%s.w - fragPosShifted.y, 0.0);", inRectParams.fsIn()); 1128 // Now compute coverage in x and y and multiply them to get the fraction of the pixel 1129 // covered. 1130 fragBuilder->codeAppendf( 1131 "float alpha = (1.0 + max(xSub, -1.0)) * (1.0 + max(ySub, -1.0));"); 1132 } else if (de.aaMode() == kMSAA_DashAAMode) { 1133 // For MSAA, we don't modulate the alpha by the Y distance, since MSAA coverage will handle 1134 // AA on the the top and bottom edges. The shader is only responsible for intra-dash alpha. 1135 fragBuilder->codeAppend("float xSub;"); 1136 fragBuilder->codeAppendf("xSub = min(fragPosShifted.x - %s.x, 0.0);", inRectParams.fsIn()); 1137 fragBuilder->codeAppendf("xSub += min(%s.z - fragPosShifted.x, 0.0);", inRectParams.fsIn()); 1138 // Now compute coverage in x to get the fraction of the pixel covered. 1139 fragBuilder->codeAppendf("float alpha = (1.0 + max(xSub, -1.0));"); 1140 } else { 1141 // Assuming the bounding geometry is tight so no need to check y values 1142 fragBuilder->codeAppendf("float alpha = 1.0;"); 1143 fragBuilder->codeAppendf("alpha *= (fragPosShifted.x - %s.x) > -0.5 ? 1.0 : 0.0;", 1144 inRectParams.fsIn()); 1145 fragBuilder->codeAppendf("alpha *= (%s.z - fragPosShifted.x) >= -0.5 ? 1.0 : 0.0;", 1146 inRectParams.fsIn()); 1147 } 1148 fragBuilder->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage); 1149 } 1150 1151 void GLDashingLineEffect::setData(const GrGLSLProgramDataManager& pdman, 1152 const GrPrimitiveProcessor& processor) { 1153 const DashingLineEffect& de = processor.cast<DashingLineEffect>(); 1154 if (de.color() != fColor) { 1155 float c[4]; 1156 GrColorToRGBAFloat(de.color(), c); 1157 pdman.set4fv(fColorUniform, 1, c); 1158 fColor = de.color(); 1159 } 1160 } 1161 1162 void GLDashingLineEffect::GenKey(const GrGeometryProcessor& gp, 1163 const GrGLSLCaps&, 1164 GrProcessorKeyBuilder* b) { 1165 const DashingLineEffect& de = gp.cast<DashingLineEffect>(); 1166 uint32_t key = 0; 1167 key |= de.usesLocalCoords() && de.localMatrix().hasPerspective() ? 0x1 : 0x0; 1168 key |= de.colorIgnored() ? 0x2 : 0x0; 1169 key |= de.aaMode() << 8; 1170 b->add32(key); 1171 } 1172 1173 ////////////////////////////////////////////////////////////////////////////// 1174 1175 GrGeometryProcessor* DashingLineEffect::Create(GrColor color, 1176 DashAAMode aaMode, 1177 const SkMatrix& localMatrix, 1178 bool usesLocalCoords) { 1179 return new DashingLineEffect(color, aaMode, localMatrix, usesLocalCoords); 1180 } 1181 1182 void DashingLineEffect::getGLSLProcessorKey(const GrGLSLCaps& caps, 1183 GrProcessorKeyBuilder* b) const { 1184 GLDashingLineEffect::GenKey(*this, caps, b); 1185 } 1186 1187 GrGLSLPrimitiveProcessor* DashingLineEffect::createGLSLInstance(const GrGLSLCaps&) const { 1188 return new GLDashingLineEffect(); 1189 } 1190 1191 DashingLineEffect::DashingLineEffect(GrColor color, 1192 DashAAMode aaMode, 1193 const SkMatrix& localMatrix, 1194 bool usesLocalCoords) 1195 : fColor(color) 1196 , fLocalMatrix(localMatrix) 1197 , fUsesLocalCoords(usesLocalCoords) 1198 , fAAMode(aaMode) { 1199 this->initClassID<DashingLineEffect>(); 1200 fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); 1201 fInDashParams = &this->addVertexAttrib(Attribute("inDashParams", kVec3f_GrVertexAttribType)); 1202 fInRectParams = &this->addVertexAttrib(Attribute("inRect", kVec4f_GrVertexAttribType)); 1203 } 1204 1205 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DashingLineEffect); 1206 1207 const GrGeometryProcessor* DashingLineEffect::TestCreate(GrProcessorTestData* d) { 1208 DashAAMode aaMode = static_cast<DashAAMode>(d->fRandom->nextULessThan(kDashAAModeCount)); 1209 return DashingLineEffect::Create(GrRandomColor(d->fRandom), 1210 aaMode, GrTest::TestMatrix(d->fRandom), 1211 d->fRandom->nextBool()); 1212 } 1213 1214 ////////////////////////////////////////////////////////////////////////////// 1215 1216 static GrGeometryProcessor* create_dash_gp(GrColor color, 1217 DashAAMode dashAAMode, 1218 DashCap cap, 1219 const SkMatrix& viewMatrix, 1220 bool usesLocalCoords) { 1221 SkMatrix invert; 1222 if (usesLocalCoords && !viewMatrix.invert(&invert)) { 1223 SkDebugf("Failed to invert\n"); 1224 return nullptr; 1225 } 1226 1227 switch (cap) { 1228 case kRound_DashCap: 1229 return DashingCircleEffect::Create(color, dashAAMode, invert, usesLocalCoords); 1230 case kNonRound_DashCap: 1231 return DashingLineEffect::Create(color, dashAAMode, invert, usesLocalCoords); 1232 } 1233 return nullptr; 1234 } 1235 1236 ///////////////////////////////////////////////////////////////////////////////////////////////// 1237 1238 #ifdef GR_TEST_UTILS 1239 1240 DRAW_BATCH_TEST_DEFINE(DashBatch) { 1241 GrColor color = GrRandomColor(random); 1242 SkMatrix viewMatrix = GrTest::TestMatrixPreservesRightAngles(random); 1243 bool useAA = random->nextBool(); 1244 bool msaaRT = random->nextBool(); 1245 1246 // We can only dash either horizontal or vertical lines 1247 SkPoint pts[2]; 1248 if (random->nextBool()) { 1249 // vertical 1250 pts[0].fX = 1.f; 1251 pts[0].fY = random->nextF() * 10.f; 1252 pts[1].fX = 1.f; 1253 pts[1].fY = random->nextF() * 10.f; 1254 } else { 1255 // horizontal 1256 pts[0].fX = random->nextF() * 10.f; 1257 pts[0].fY = 1.f; 1258 pts[1].fX = random->nextF() * 10.f; 1259 pts[1].fY = 1.f; 1260 } 1261 1262 // pick random cap 1263 SkPaint::Cap cap = SkPaint::Cap(random->nextULessThan(SkPaint::Cap::kCapCount)); 1264 1265 SkScalar intervals[2]; 1266 1267 // We can only dash with the following intervals 1268 enum Intervals { 1269 kOpenOpen_Intervals , 1270 kOpenClose_Intervals, 1271 kCloseOpen_Intervals, 1272 }; 1273 1274 Intervals intervalType = SkPaint::kRound_Cap ? 1275 kOpenClose_Intervals : 1276 Intervals(random->nextULessThan(kCloseOpen_Intervals + 1)); 1277 static const SkScalar kIntervalMin = 0.1f; 1278 static const SkScalar kIntervalMax = 10.f; 1279 switch (intervalType) { 1280 case kOpenOpen_Intervals: 1281 intervals[0] = random->nextRangeScalar(kIntervalMin, kIntervalMax); 1282 intervals[1] = random->nextRangeScalar(kIntervalMin, kIntervalMax); 1283 break; 1284 case kOpenClose_Intervals: 1285 intervals[0] = 0.f; 1286 intervals[1] = random->nextRangeScalar(kIntervalMin, kIntervalMax); 1287 break; 1288 case kCloseOpen_Intervals: 1289 intervals[0] = random->nextRangeScalar(kIntervalMin, kIntervalMax); 1290 intervals[1] = 0.f; 1291 break; 1292 1293 } 1294 1295 // phase is 0 < sum (i0, i1) 1296 SkScalar phase = random->nextRangeScalar(0, intervals[0] + intervals[1]); 1297 1298 SkPaint p; 1299 p.setStyle(SkPaint::kStroke_Style); 1300 p.setStrokeWidth(SkIntToScalar(1)); 1301 p.setStrokeCap(cap); 1302 1303 GrStrokeInfo strokeInfo(p); 1304 1305 SkPathEffect::DashInfo info; 1306 info.fIntervals = intervals; 1307 info.fCount = 2; 1308 info.fPhase = phase; 1309 SkDEBUGCODE(bool success = ) strokeInfo.setDashInfo(info); 1310 SkASSERT(success); 1311 1312 return create_batch(color, viewMatrix, pts, useAA, strokeInfo, msaaRT); 1313 } 1314 1315 #endif 1316
