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Diffstat (limited to 'src/gpu/ops/GrDashOp.cpp')
| -rw-r--r-- | src/gpu/ops/GrDashOp.cpp | 1281 |
1 files changed, 1281 insertions, 0 deletions
diff --git a/src/gpu/ops/GrDashOp.cpp b/src/gpu/ops/GrDashOp.cpp new file mode 100644 index 0000000000..92184825ac --- /dev/null +++ b/src/gpu/ops/GrDashOp.cpp @@ -0,0 +1,1281 @@ +/* + * Copyright 2014 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "GrDashOp.h" + +#include "GrBatchTest.h" +#include "GrCaps.h" +#include "GrContext.h" +#include "GrCoordTransform.h" +#include "GrDefaultGeoProcFactory.h" +#include "GrGeometryProcessor.h" +#include "GrInvariantOutput.h" +#include "GrOpFlushState.h" +#include "GrProcessor.h" +#include "GrStyle.h" +#include "SkGr.h" +#include "glsl/GrGLSLFragmentShaderBuilder.h" +#include "glsl/GrGLSLGeometryProcessor.h" +#include "glsl/GrGLSLProgramDataManager.h" +#include "glsl/GrGLSLUniformHandler.h" +#include "glsl/GrGLSLVarying.h" +#include "glsl/GrGLSLVertexShaderBuilder.h" +#include "ops/GrMeshDrawOp.h" + +using AAMode = GrDashOp::AAMode; + +/////////////////////////////////////////////////////////////////////////////// + +// Returns whether or not the gpu can fast path the dash line effect. +bool GrDashOp::CanDrawDashLine(const SkPoint pts[2], const GrStyle& style, + const SkMatrix& viewMatrix) { + // Pts must be either horizontal or vertical in src space + if (pts[0].fX != pts[1].fX && pts[0].fY != pts[1].fY) { + return false; + } + + // May be able to relax this to include skew. As of now cannot do perspective + // because of the non uniform scaling of bloating a rect + if (!viewMatrix.preservesRightAngles()) { + return false; + } + + if (!style.isDashed() || 2 != style.dashIntervalCnt()) { + return false; + } + + const SkScalar* intervals = style.dashIntervals(); + if (0 == intervals[0] && 0 == intervals[1]) { + return false; + } + + SkPaint::Cap cap = style.strokeRec().getCap(); + // Current we do don't handle Round or Square cap dashes + if (SkPaint::kRound_Cap == cap && intervals[0] != 0.f) { + return false; + } + + return true; +} + +namespace { +struct DashLineVertex { + SkPoint fPos; + SkPoint fDashPos; + SkScalar fIntervalLength; + SkRect fRect; +}; +struct DashCircleVertex { + SkPoint fPos; + SkPoint fDashPos; + SkScalar fIntervalLength; + SkScalar fRadius; + SkScalar fCenterX; +}; +}; + +static void calc_dash_scaling(SkScalar* parallelScale, SkScalar* perpScale, + const SkMatrix& viewMatrix, const SkPoint pts[2]) { + SkVector vecSrc = pts[1] - pts[0]; + SkScalar magSrc = vecSrc.length(); + SkScalar invSrc = magSrc ? SkScalarInvert(magSrc) : 0; + vecSrc.scale(invSrc); + + SkVector vecSrcPerp; + vecSrc.rotateCW(&vecSrcPerp); + viewMatrix.mapVectors(&vecSrc, 1); + viewMatrix.mapVectors(&vecSrcPerp, 1); + + // parallelScale tells how much to scale along the line parallel to the dash line + // perpScale tells how much to scale in the direction perpendicular to the dash line + *parallelScale = vecSrc.length(); + *perpScale = vecSrcPerp.length(); +} + +// calculates the rotation needed to aligned pts to the x axis with pts[0] < pts[1] +// Stores the rotation matrix in rotMatrix, and the mapped points in ptsRot +static void align_to_x_axis(const SkPoint pts[2], SkMatrix* rotMatrix, SkPoint ptsRot[2] = nullptr) { + SkVector vec = pts[1] - pts[0]; + SkScalar mag = vec.length(); + SkScalar inv = mag ? SkScalarInvert(mag) : 0; + + vec.scale(inv); + rotMatrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); + if (ptsRot) { + rotMatrix->mapPoints(ptsRot, pts, 2); + // correction for numerical issues if map doesn't make ptsRot exactly horizontal + ptsRot[1].fY = pts[0].fY; + } +} + +// Assumes phase < sum of all intervals +static SkScalar calc_start_adjustment(const SkScalar intervals[2], SkScalar phase) { + SkASSERT(phase < intervals[0] + intervals[1]); + if (phase >= intervals[0] && phase != 0) { + SkScalar srcIntervalLen = intervals[0] + intervals[1]; + return srcIntervalLen - phase; + } + return 0; +} + +static SkScalar calc_end_adjustment(const SkScalar intervals[2], const SkPoint pts[2], + SkScalar phase, SkScalar* endingInt) { + if (pts[1].fX <= pts[0].fX) { + return 0; + } + SkScalar srcIntervalLen = intervals[0] + intervals[1]; + SkScalar totalLen = pts[1].fX - pts[0].fX; + SkScalar temp = totalLen / srcIntervalLen; + SkScalar numFullIntervals = SkScalarFloorToScalar(temp); + *endingInt = totalLen - numFullIntervals * srcIntervalLen + phase; + temp = *endingInt / srcIntervalLen; + *endingInt = *endingInt - SkScalarFloorToScalar(temp) * srcIntervalLen; + if (0 == *endingInt) { + *endingInt = srcIntervalLen; + } + if (*endingInt > intervals[0]) { + if (0 == intervals[0]) { + *endingInt -= 0.01f; // make sure we capture the last zero size pnt (used if has caps) + } + return *endingInt - intervals[0]; + } + return 0; +} + +enum DashCap { + kRound_DashCap, + kNonRound_DashCap, +}; + +static int kDashVertices = 4; + +template <typename T> +void setup_dashed_rect_common(const SkRect& rect, const SkMatrix& matrix, T* vertices, int idx, + SkScalar offset, SkScalar bloatX, SkScalar bloatY, SkScalar len, + SkScalar stroke) { + SkScalar startDashX = offset - bloatX; + SkScalar endDashX = offset + len + bloatX; + SkScalar startDashY = -stroke - bloatY; + SkScalar endDashY = stroke + bloatY; + vertices[idx].fDashPos = SkPoint::Make(startDashX , startDashY); + vertices[idx + 1].fDashPos = SkPoint::Make(startDashX, endDashY); + vertices[idx + 2].fDashPos = SkPoint::Make(endDashX, endDashY); + vertices[idx + 3].fDashPos = SkPoint::Make(endDashX, startDashY); + + vertices[idx].fPos = SkPoint::Make(rect.fLeft, rect.fTop); + vertices[idx + 1].fPos = SkPoint::Make(rect.fLeft, rect.fBottom); + vertices[idx + 2].fPos = SkPoint::Make(rect.fRight, rect.fBottom); + vertices[idx + 3].fPos = SkPoint::Make(rect.fRight, rect.fTop); + + matrix.mapPointsWithStride(&vertices[idx].fPos, sizeof(T), 4); +} + +static void setup_dashed_rect(const SkRect& rect, void* vertices, int idx, + const SkMatrix& matrix, SkScalar offset, SkScalar bloatX, + SkScalar bloatY, SkScalar len, SkScalar stroke, + SkScalar startInterval, SkScalar endInterval, SkScalar strokeWidth, + DashCap cap, const size_t vertexStride) { + SkScalar intervalLength = startInterval + endInterval; + + if (kRound_DashCap == cap) { + SkASSERT(vertexStride == sizeof(DashCircleVertex)); + DashCircleVertex* verts = reinterpret_cast<DashCircleVertex*>(vertices); + + setup_dashed_rect_common<DashCircleVertex>(rect, matrix, verts, idx, offset, bloatX, + bloatY, len, stroke); + + SkScalar radius = SkScalarHalf(strokeWidth) - 0.5f; + SkScalar centerX = SkScalarHalf(endInterval); + + for (int i = 0; i < kDashVertices; i++) { + verts[idx + i].fIntervalLength = intervalLength; + verts[idx + i].fRadius = radius; + verts[idx + i].fCenterX = centerX; + } + + } else { + SkASSERT(kNonRound_DashCap == cap && vertexStride == sizeof(DashLineVertex)); + DashLineVertex* verts = reinterpret_cast<DashLineVertex*>(vertices); + + setup_dashed_rect_common<DashLineVertex>(rect, matrix, verts, idx, offset, bloatX, + bloatY, len, stroke); + + SkScalar halfOffLen = SkScalarHalf(endInterval); + SkScalar halfStroke = SkScalarHalf(strokeWidth); + SkRect rectParam; + rectParam.set(halfOffLen + 0.5f, -halfStroke + 0.5f, + halfOffLen + startInterval - 0.5f, halfStroke - 0.5f); + for (int i = 0; i < kDashVertices; i++) { + verts[idx + i].fIntervalLength = intervalLength; + verts[idx + i].fRect = rectParam; + } + } +} + +static void setup_dashed_rect_pos(const SkRect& rect, int idx, const SkMatrix& matrix, + SkPoint* verts) { + verts[idx] = SkPoint::Make(rect.fLeft, rect.fTop); + verts[idx + 1] = SkPoint::Make(rect.fLeft, rect.fBottom); + verts[idx + 2] = SkPoint::Make(rect.fRight, rect.fBottom); + verts[idx + 3] = SkPoint::Make(rect.fRight, rect.fTop); + matrix.mapPoints(&verts[idx], 4); +} + + +/** + * An GrGeometryProcessor that renders a dashed line. + * This GrGeometryProcessor is meant for dashed lines that only have a single on/off interval pair. + * Bounding geometry is rendered and the effect computes coverage based on the fragment's + * position relative to the dashed line. + */ +static sk_sp<GrGeometryProcessor> make_dash_gp(GrColor, + AAMode aaMode, + DashCap cap, + const SkMatrix& localMatrix, + bool usesLocalCoords); + +class DashOp final : public GrMeshDrawOp { +public: + DEFINE_OP_CLASS_ID + struct LineData { + SkMatrix fViewMatrix; + SkMatrix fSrcRotInv; + SkPoint fPtsRot[2]; + SkScalar fSrcStrokeWidth; + SkScalar fPhase; + SkScalar fIntervals[2]; + SkScalar fParallelScale; + SkScalar fPerpendicularScale; + }; + + static sk_sp<GrDrawOp> Make(const LineData& geometry, GrColor color, SkPaint::Cap cap, + AAMode aaMode, bool fullDash) { + return sk_sp<GrDrawOp>(new DashOp(geometry, color, cap, aaMode, fullDash)); + } + + const char* name() const override { return "DashOp"; } + + SkString dumpInfo() const override { + SkString string; + for (const auto& geo : fLines) { + string.appendf("Pt0: [%.2f, %.2f], Pt1: [%.2f, %.2f], Width: %.2f, Ival0: %.2f, " + "Ival1 : %.2f, Phase: %.2f\n", + geo.fPtsRot[0].fX, geo.fPtsRot[0].fY, + geo.fPtsRot[1].fX, geo.fPtsRot[1].fY, + geo.fSrcStrokeWidth, + geo.fIntervals[0], + geo.fIntervals[1], + geo.fPhase); + } + string.append(DumpPipelineInfo(*this->pipeline())); + string.append(INHERITED::dumpInfo()); + return string; + } + + void computePipelineOptimizations(GrInitInvariantOutput* color, + GrInitInvariantOutput* coverage, + GrBatchToXPOverrides* overrides) const override { + color->setKnownFourComponents(fColor); + coverage->setUnknownSingleComponent(); + } + +private: + DashOp(const LineData& geometry, GrColor color, SkPaint::Cap cap, AAMode aaMode, bool fullDash) + : INHERITED(ClassID()), fColor(color), fCap(cap), fAAMode(aaMode), fFullDash(fullDash) { + fLines.push_back(geometry); + + // compute bounds + SkScalar halfStrokeWidth = 0.5f * geometry.fSrcStrokeWidth; + SkScalar xBloat = SkPaint::kButt_Cap == cap ? 0 : halfStrokeWidth; + SkRect bounds; + bounds.set(geometry.fPtsRot[0], geometry.fPtsRot[1]); + bounds.outset(xBloat, halfStrokeWidth); + + // Note, we actually create the combined matrix here, and save the work + SkMatrix& combinedMatrix = fLines[0].fSrcRotInv; + combinedMatrix.postConcat(geometry.fViewMatrix); + + IsZeroArea zeroArea = geometry.fSrcStrokeWidth ? IsZeroArea::kNo : IsZeroArea::kYes; + HasAABloat aaBloat = (aaMode == AAMode::kNone) ? HasAABloat ::kNo : HasAABloat::kYes; + this->setTransformedBounds(bounds, combinedMatrix, aaBloat, zeroArea); + } + + void initBatchTracker(const GrXPOverridesForBatch& overrides) override { + // Handle any color overrides + if (!overrides.readsColor()) { + fColor = GrColor_ILLEGAL; + } + overrides.getOverrideColorIfSet(&fColor); + + fUsesLocalCoords = overrides.readsLocalCoords(); + fCoverageIgnored = !overrides.readsCoverage(); + } + + struct DashDraw { + DashDraw(const LineData& geo) { + memcpy(fPtsRot, geo.fPtsRot, sizeof(geo.fPtsRot)); + memcpy(fIntervals, geo.fIntervals, sizeof(geo.fIntervals)); + fPhase = geo.fPhase; + } + SkPoint fPtsRot[2]; + SkScalar fIntervals[2]; + SkScalar fPhase; + SkScalar fStartOffset; + SkScalar fStrokeWidth; + SkScalar fLineLength; + SkScalar fHalfDevStroke; + SkScalar fDevBloatX; + SkScalar fDevBloatY; + bool fLineDone; + bool fHasStartRect; + bool fHasEndRect; + }; + + void onPrepareDraws(Target* target) const override { + int instanceCount = fLines.count(); + SkPaint::Cap cap = this->cap(); + bool isRoundCap = SkPaint::kRound_Cap == cap; + DashCap capType = isRoundCap ? kRound_DashCap : kNonRound_DashCap; + + sk_sp<GrGeometryProcessor> gp; + if (this->fullDash()) { + gp = make_dash_gp(this->color(), this->aaMode(), capType, this->viewMatrix(), + this->usesLocalCoords()); + } else { + // Set up the vertex data for the line and start/end dashes + using namespace GrDefaultGeoProcFactory; + Color color(this->color()); + Coverage coverage(this->coverageIgnored() ? Coverage::kNone_Type : + Coverage::kSolid_Type); + LocalCoords localCoords(this->usesLocalCoords() ? LocalCoords::kUsePosition_Type : + LocalCoords::kUnused_Type); + gp = MakeForDeviceSpace(color, coverage, localCoords, this->viewMatrix()); + } + + if (!gp) { + SkDebugf("Could not create GrGeometryProcessor\n"); + return; + } + + // useAA here means Edge AA or MSAA + bool useAA = this->aaMode() != AAMode::kNone; + bool fullDash = this->fullDash(); + + // We do two passes over all of the dashes. First we setup the start, end, and bounds, + // rectangles. We preserve all of this work in the rects / draws arrays below. Then we + // iterate again over these decomposed dashes to generate vertices + static const int kNumStackDashes = 128; + SkSTArray<kNumStackDashes, SkRect, true> rects; + SkSTArray<kNumStackDashes, DashDraw, true> draws; + + int totalRectCount = 0; + int rectOffset = 0; + rects.push_back_n(3 * instanceCount); + for (int i = 0; i < instanceCount; i++) { + const LineData& args = fLines[i]; + + DashDraw& draw = draws.push_back(args); + + bool hasCap = SkPaint::kButt_Cap != cap && 0 != args.fSrcStrokeWidth; + + // We always want to at least stroke out half a pixel on each side in device space + // so 0.5f / perpScale gives us this min in src space + SkScalar halfSrcStroke = + SkMaxScalar(args.fSrcStrokeWidth * 0.5f, 0.5f / args.fPerpendicularScale); + + SkScalar strokeAdj; + if (!hasCap) { + strokeAdj = 0.f; + } else { + strokeAdj = halfSrcStroke; + } + + SkScalar startAdj = 0; + + bool lineDone = false; + + // Too simplify the algorithm, we always push back rects for start and end rect. + // Otherwise we'd have to track start / end rects for each individual geometry + SkRect& bounds = rects[rectOffset++]; + SkRect& startRect = rects[rectOffset++]; + SkRect& endRect = rects[rectOffset++]; + + bool hasStartRect = false; + // If we are using AA, check to see if we are drawing a partial dash at the start. If so + // draw it separately here and adjust our start point accordingly + if (useAA) { + if (draw.fPhase > 0 && draw.fPhase < draw.fIntervals[0]) { + SkPoint startPts[2]; + startPts[0] = draw.fPtsRot[0]; + startPts[1].fY = startPts[0].fY; + startPts[1].fX = SkMinScalar(startPts[0].fX + draw.fIntervals[0] - draw.fPhase, + draw.fPtsRot[1].fX); + startRect.set(startPts, 2); + startRect.outset(strokeAdj, halfSrcStroke); + + hasStartRect = true; + startAdj = draw.fIntervals[0] + draw.fIntervals[1] - draw.fPhase; + } + } + + // adjustments for start and end of bounding rect so we only draw dash intervals + // contained in the original line segment. + startAdj += calc_start_adjustment(draw.fIntervals, draw.fPhase); + if (startAdj != 0) { + draw.fPtsRot[0].fX += startAdj; + draw.fPhase = 0; + } + SkScalar endingInterval = 0; + SkScalar endAdj = calc_end_adjustment(draw.fIntervals, draw.fPtsRot, draw.fPhase, + &endingInterval); + draw.fPtsRot[1].fX -= endAdj; + if (draw.fPtsRot[0].fX >= draw.fPtsRot[1].fX) { + lineDone = true; + } + + bool hasEndRect = false; + // If we are using AA, check to see if we are drawing a partial dash at then end. If so + // draw it separately here and adjust our end point accordingly + if (useAA && !lineDone) { + // If we adjusted the end then we will not be drawing a partial dash at the end. + // If we didn't adjust the end point then we just need to make sure the ending + // dash isn't a full dash + if (0 == endAdj && endingInterval != draw.fIntervals[0]) { + SkPoint endPts[2]; + endPts[1] = draw.fPtsRot[1]; + endPts[0].fY = endPts[1].fY; + endPts[0].fX = endPts[1].fX - endingInterval; + + endRect.set(endPts, 2); + endRect.outset(strokeAdj, halfSrcStroke); + + hasEndRect = true; + endAdj = endingInterval + draw.fIntervals[1]; + + draw.fPtsRot[1].fX -= endAdj; + if (draw.fPtsRot[0].fX >= draw.fPtsRot[1].fX) { + lineDone = true; + } + } + } + + if (startAdj != 0) { + draw.fPhase = 0; + } + + // Change the dashing info from src space into device space + SkScalar* devIntervals = draw.fIntervals; + devIntervals[0] = draw.fIntervals[0] * args.fParallelScale; + devIntervals[1] = draw.fIntervals[1] * args.fParallelScale; + SkScalar devPhase = draw.fPhase * args.fParallelScale; + SkScalar strokeWidth = args.fSrcStrokeWidth * args.fPerpendicularScale; + + if ((strokeWidth < 1.f && useAA) || 0.f == strokeWidth) { + strokeWidth = 1.f; + } + + SkScalar halfDevStroke = strokeWidth * 0.5f; + + if (SkPaint::kSquare_Cap == cap && 0 != args.fSrcStrokeWidth) { + // add cap to on interval and remove from off interval + devIntervals[0] += strokeWidth; + devIntervals[1] -= strokeWidth; + } + SkScalar startOffset = devIntervals[1] * 0.5f + devPhase; + + // For EdgeAA, we bloat in X & Y for both square and round caps. + // For MSAA, we don't bloat at all for square caps, and bloat in Y only for round caps. + SkScalar devBloatX = this->aaMode() == AAMode::kCoverage ? 0.5f : 0.0f; + SkScalar devBloatY; + if (SkPaint::kRound_Cap == cap && this->aaMode() == AAMode::kCoverageWithMSAA) { + devBloatY = 0.5f; + } else { + devBloatY = devBloatX; + } + + SkScalar bloatX = devBloatX / args.fParallelScale; + SkScalar bloatY = devBloatY / args.fPerpendicularScale; + + if (devIntervals[1] <= 0.f && useAA) { + // Case when we end up drawing a solid AA rect + // Reset the start rect to draw this single solid rect + // but it requires to upload a new intervals uniform so we can mimic + // one giant dash + draw.fPtsRot[0].fX -= hasStartRect ? startAdj : 0; + draw.fPtsRot[1].fX += hasEndRect ? endAdj : 0; + startRect.set(draw.fPtsRot, 2); + startRect.outset(strokeAdj, halfSrcStroke); + hasStartRect = true; + hasEndRect = false; + lineDone = true; + + SkPoint devicePts[2]; + args.fViewMatrix.mapPoints(devicePts, draw.fPtsRot, 2); + SkScalar lineLength = SkPoint::Distance(devicePts[0], devicePts[1]); + if (hasCap) { + lineLength += 2.f * halfDevStroke; + } + devIntervals[0] = lineLength; + } + + totalRectCount += !lineDone ? 1 : 0; + totalRectCount += hasStartRect ? 1 : 0; + totalRectCount += hasEndRect ? 1 : 0; + + if (SkPaint::kRound_Cap == cap && 0 != args.fSrcStrokeWidth) { + // need to adjust this for round caps to correctly set the dashPos attrib on + // vertices + startOffset -= halfDevStroke; + } + + if (!lineDone) { + SkPoint devicePts[2]; + args.fViewMatrix.mapPoints(devicePts, draw.fPtsRot, 2); + draw.fLineLength = SkPoint::Distance(devicePts[0], devicePts[1]); + if (hasCap) { + draw.fLineLength += 2.f * halfDevStroke; + } + + bounds.set(draw.fPtsRot[0].fX, draw.fPtsRot[0].fY, + draw.fPtsRot[1].fX, draw.fPtsRot[1].fY); + bounds.outset(bloatX + strokeAdj, bloatY + halfSrcStroke); + } + + if (hasStartRect) { + SkASSERT(useAA); // so that we know bloatX and bloatY have been set + startRect.outset(bloatX, bloatY); + } + + if (hasEndRect) { + SkASSERT(useAA); // so that we know bloatX and bloatY have been set + endRect.outset(bloatX, bloatY); + } + + draw.fStartOffset = startOffset; + draw.fDevBloatX = devBloatX; + draw.fDevBloatY = devBloatY; + draw.fHalfDevStroke = halfDevStroke; + draw.fStrokeWidth = strokeWidth; + draw.fHasStartRect = hasStartRect; + draw.fLineDone = lineDone; + draw.fHasEndRect = hasEndRect; + } + + if (!totalRectCount) { + return; + } + + QuadHelper helper; + void* vertices = helper.init(target, gp->getVertexStride(), totalRectCount); + if (!vertices) { + return; + } + + int curVIdx = 0; + int rectIndex = 0; + for (int i = 0; i < instanceCount; i++) { + const LineData& geom = fLines[i]; + + if (!draws[i].fLineDone) { + if (fullDash) { + setup_dashed_rect(rects[rectIndex], vertices, curVIdx, geom.fSrcRotInv, + draws[i].fStartOffset, draws[i].fDevBloatX, + draws[i].fDevBloatY, draws[i].fLineLength, + draws[i].fHalfDevStroke, draws[i].fIntervals[0], + draws[i].fIntervals[1], draws[i].fStrokeWidth, + capType, gp->getVertexStride()); + } else { + SkPoint* verts = reinterpret_cast<SkPoint*>(vertices); + SkASSERT(gp->getVertexStride() == sizeof(SkPoint)); + setup_dashed_rect_pos(rects[rectIndex], curVIdx, geom.fSrcRotInv, verts); + } + curVIdx += 4; + } + rectIndex++; + + if (draws[i].fHasStartRect) { + if (fullDash) { + setup_dashed_rect(rects[rectIndex], vertices, curVIdx, geom.fSrcRotInv, + draws[i].fStartOffset, draws[i].fDevBloatX, + draws[i].fDevBloatY, draws[i].fIntervals[0], + draws[i].fHalfDevStroke, draws[i].fIntervals[0], + draws[i].fIntervals[1], draws[i].fStrokeWidth, capType, + gp->getVertexStride()); + } else { + SkPoint* verts = reinterpret_cast<SkPoint*>(vertices); + SkASSERT(gp->getVertexStride() == sizeof(SkPoint)); + setup_dashed_rect_pos(rects[rectIndex], curVIdx, geom.fSrcRotInv, verts); + } + curVIdx += 4; + } + rectIndex++; + + if (draws[i].fHasEndRect) { + if (fullDash) { + setup_dashed_rect(rects[rectIndex], vertices, curVIdx, geom.fSrcRotInv, + draws[i].fStartOffset, draws[i].fDevBloatX, + draws[i].fDevBloatY, draws[i].fIntervals[0], + draws[i].fHalfDevStroke, draws[i].fIntervals[0], + draws[i].fIntervals[1], draws[i].fStrokeWidth, capType, + gp->getVertexStride()); + } else { + SkPoint* verts = reinterpret_cast<SkPoint*>(vertices); + SkASSERT(gp->getVertexStride() == sizeof(SkPoint)); + setup_dashed_rect_pos(rects[rectIndex], curVIdx, geom.fSrcRotInv, verts); + } + curVIdx += 4; + } + rectIndex++; + } + SkASSERT(0 == (curVIdx % 4) && (curVIdx / 4) == totalRectCount); + helper.recordDraw(target, gp.get()); + } + + bool onCombineIfPossible(GrOp* t, const GrCaps& caps) override { + DashOp* that = t->cast<DashOp>(); + if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *that->pipeline(), + that->bounds(), caps)) { + return false; + } + + if (this->aaMode() != that->aaMode()) { + return false; + } + + if (this->fullDash() != that->fullDash()) { + return false; + } + + if (this->cap() != that->cap()) { + return false; + } + + // TODO vertex color + if (this->color() != that->color()) { + return false; + } + + SkASSERT(this->usesLocalCoords() == that->usesLocalCoords()); + if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) { + return false; + } + + fLines.push_back_n(that->fLines.count(), that->fLines.begin()); + this->joinBounds(*that); + return true; + } + + GrColor color() const { return fColor; } + bool usesLocalCoords() const { return fUsesLocalCoords; } + const SkMatrix& viewMatrix() const { return fLines[0].fViewMatrix; } + AAMode aaMode() const { return fAAMode; } + bool fullDash() const { return fFullDash; } + SkPaint::Cap cap() const { return fCap; } + bool coverageIgnored() const { return fCoverageIgnored; } + + static const int kVertsPerDash = 4; + static const int kIndicesPerDash = 6; + + GrColor fColor; + bool fUsesLocalCoords; + bool fCoverageIgnored; + SkPaint::Cap fCap; + AAMode fAAMode; + bool fFullDash; + SkSTArray<1, LineData, true> fLines; + + typedef GrMeshDrawOp INHERITED; +}; + +sk_sp<GrDrawOp> GrDashOp::MakeDashLineOp(GrColor color, + const SkMatrix& viewMatrix, + const SkPoint pts[2], + AAMode aaMode, + const GrStyle& style) { + SkASSERT(GrDashOp::CanDrawDashLine(pts, style, viewMatrix)); + const SkScalar* intervals = style.dashIntervals(); + SkScalar phase = style.dashPhase(); + + SkPaint::Cap cap = style.strokeRec().getCap(); + + DashOp::LineData lineData; + lineData.fSrcStrokeWidth = style.strokeRec().getWidth(); + + // the phase should be normalized to be [0, sum of all intervals) + SkASSERT(phase >= 0 && phase < intervals[0] + intervals[1]); + + // Rotate the src pts so they are aligned horizontally with pts[0].fX < pts[1].fX + if (pts[0].fY != pts[1].fY || pts[0].fX > pts[1].fX) { + SkMatrix rotMatrix; + align_to_x_axis(pts, &rotMatrix, lineData.fPtsRot); + if (!rotMatrix.invert(&lineData.fSrcRotInv)) { + SkDebugf("Failed to create invertible rotation matrix!\n"); + return nullptr; + } + } else { + lineData.fSrcRotInv.reset(); + memcpy(lineData.fPtsRot, pts, 2 * sizeof(SkPoint)); + } + + // Scale corrections of intervals and stroke from view matrix + calc_dash_scaling(&lineData.fParallelScale, &lineData.fPerpendicularScale, viewMatrix, + lineData.fPtsRot); + + SkScalar offInterval = intervals[1] * lineData.fParallelScale; + SkScalar strokeWidth = lineData.fSrcStrokeWidth * lineData.fPerpendicularScale; + + if (SkPaint::kSquare_Cap == cap && 0 != lineData.fSrcStrokeWidth) { + // add cap to on interveal and remove from off interval + offInterval -= strokeWidth; + } + + // TODO we can do a real rect call if not using fulldash(ie no off interval, not using AA) + bool fullDash = offInterval > 0.f || aaMode != AAMode::kNone; + + lineData.fViewMatrix = viewMatrix; + lineData.fPhase = phase; + lineData.fIntervals[0] = intervals[0]; + lineData.fIntervals[1] = intervals[1]; + + return DashOp::Make(lineData, color, cap, aaMode, fullDash); +} + +////////////////////////////////////////////////////////////////////////////// + +class GLDashingCircleEffect; + +/* + * This effect will draw a dotted line (defined as a dashed lined with round caps and no on + * interval). The radius of the dots is given by the strokeWidth and the spacing by the DashInfo. + * Both of the previous two parameters are in device space. This effect also requires the setting of + * a vec2 vertex attribute for the the four corners of the bounding rect. This attribute is the + * "dash position" of each vertex. In other words it is the vertex coords (in device space) if we + * transform the line to be horizontal, with the start of line at the origin then shifted to the + * right by half the off interval. The line then goes in the positive x direction. + */ +class DashingCircleEffect : public GrGeometryProcessor { +public: + typedef SkPathEffect::DashInfo DashInfo; + + static sk_sp<GrGeometryProcessor> Make(GrColor, + AAMode aaMode, + const SkMatrix& localMatrix, + bool usesLocalCoords); + + const char* name() const override { return "DashingCircleEffect"; } + + const Attribute* inPosition() const { return fInPosition; } + + const Attribute* inDashParams() const { return fInDashParams; } + + const Attribute* inCircleParams() const { return fInCircleParams; } + + AAMode aaMode() const { return fAAMode; } + + GrColor color() const { return fColor; } + + bool colorIgnored() const { return GrColor_ILLEGAL == fColor; } + + const SkMatrix& localMatrix() const { return fLocalMatrix; } + + bool usesLocalCoords() const { return fUsesLocalCoords; } + + void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const override; + + GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override; + +private: + DashingCircleEffect(GrColor, AAMode aaMode, const SkMatrix& localMatrix, + bool usesLocalCoords); + + GrColor fColor; + SkMatrix fLocalMatrix; + bool fUsesLocalCoords; + AAMode fAAMode; + const Attribute* fInPosition; + const Attribute* fInDashParams; + const Attribute* fInCircleParams; + + GR_DECLARE_GEOMETRY_PROCESSOR_TEST; + + typedef GrGeometryProcessor INHERITED; +}; + +////////////////////////////////////////////////////////////////////////////// + +class GLDashingCircleEffect : public GrGLSLGeometryProcessor { +public: + GLDashingCircleEffect(); + + void onEmitCode(EmitArgs&, GrGPArgs*) override; + + static inline void GenKey(const GrGeometryProcessor&, + const GrShaderCaps&, + GrProcessorKeyBuilder*); + + void setData(const GrGLSLProgramDataManager&, const GrPrimitiveProcessor&, + FPCoordTransformIter&& transformIter) override; +private: + UniformHandle fParamUniform; + UniformHandle fColorUniform; + GrColor fColor; + SkScalar fPrevRadius; + SkScalar fPrevCenterX; + SkScalar fPrevIntervalLength; + typedef GrGLSLGeometryProcessor INHERITED; +}; + +GLDashingCircleEffect::GLDashingCircleEffect() { + fColor = GrColor_ILLEGAL; + fPrevRadius = SK_ScalarMin; + fPrevCenterX = SK_ScalarMin; + fPrevIntervalLength = SK_ScalarMax; +} + +void GLDashingCircleEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) { + const DashingCircleEffect& dce = args.fGP.cast<DashingCircleEffect>(); + GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; + GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; + GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; + + // emit attributes + varyingHandler->emitAttributes(dce); + + // XY are dashPos, Z is dashInterval + GrGLSLVertToFrag dashParams(kVec3f_GrSLType); + varyingHandler->addVarying("DashParam", &dashParams); + vertBuilder->codeAppendf("%s = %s;", dashParams.vsOut(), dce.inDashParams()->fName); + + // x refers to circle radius - 0.5, y refers to cicle's center x coord + GrGLSLVertToFrag circleParams(kVec2f_GrSLType); + varyingHandler->addVarying("CircleParams", &circleParams); + vertBuilder->codeAppendf("%s = %s;", circleParams.vsOut(), dce.inCircleParams()->fName); + + GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; + // Setup pass through color + if (!dce.colorIgnored()) { + this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor, &fColorUniform); + } + + // Setup position + this->setupPosition(vertBuilder, gpArgs, dce.inPosition()->fName); + + // emit transforms + this->emitTransforms(vertBuilder, + varyingHandler, + uniformHandler, + gpArgs->fPositionVar, + dce.inPosition()->fName, + dce.localMatrix(), + args.fFPCoordTransformHandler); + + // transforms all points so that we can compare them to our test circle + fragBuilder->codeAppendf("float xShifted = %s.x - floor(%s.x / %s.z) * %s.z;", + dashParams.fsIn(), dashParams.fsIn(), dashParams.fsIn(), + dashParams.fsIn()); + fragBuilder->codeAppendf("vec2 fragPosShifted = vec2(xShifted, %s.y);", dashParams.fsIn()); + fragBuilder->codeAppendf("vec2 center = vec2(%s.y, 0.0);", circleParams.fsIn()); + fragBuilder->codeAppend("float dist = length(center - fragPosShifted);"); + if (dce.aaMode() != AAMode::kNone) { + fragBuilder->codeAppendf("float diff = dist - %s.x;", circleParams.fsIn()); + fragBuilder->codeAppend("diff = 1.0 - diff;"); + fragBuilder->codeAppend("float alpha = clamp(diff, 0.0, 1.0);"); + } else { + fragBuilder->codeAppendf("float alpha = 1.0;"); + fragBuilder->codeAppendf("alpha *= dist < %s.x + 0.5 ? 1.0 : 0.0;", circleParams.fsIn()); + } + fragBuilder->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage); +} + +void GLDashingCircleEffect::setData(const GrGLSLProgramDataManager& pdman, + const GrPrimitiveProcessor& processor, + FPCoordTransformIter&& transformIter) { + const DashingCircleEffect& dce = processor.cast<DashingCircleEffect>(); + if (dce.color() != fColor) { + float c[4]; + GrColorToRGBAFloat(dce.color(), c); + pdman.set4fv(fColorUniform, 1, c); + fColor = dce.color(); + } + this->setTransformDataHelper(dce.localMatrix(), pdman, &transformIter); +} + +void GLDashingCircleEffect::GenKey(const GrGeometryProcessor& gp, + const GrShaderCaps&, + GrProcessorKeyBuilder* b) { + const DashingCircleEffect& dce = gp.cast<DashingCircleEffect>(); + uint32_t key = 0; + key |= dce.usesLocalCoords() && dce.localMatrix().hasPerspective() ? 0x1 : 0x0; + key |= dce.colorIgnored() ? 0x2 : 0x0; + key |= static_cast<uint32_t>(dce.aaMode()) << 8; + b->add32(key); +} + +////////////////////////////////////////////////////////////////////////////// + +sk_sp<GrGeometryProcessor> DashingCircleEffect::Make(GrColor color, + AAMode aaMode, + const SkMatrix& localMatrix, + bool usesLocalCoords) { + return sk_sp<GrGeometryProcessor>( + new DashingCircleEffect(color, aaMode, localMatrix, usesLocalCoords)); +} + +void DashingCircleEffect::getGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const { + GLDashingCircleEffect::GenKey(*this, caps, b); +} + +GrGLSLPrimitiveProcessor* DashingCircleEffect::createGLSLInstance(const GrShaderCaps&) const { + return new GLDashingCircleEffect(); +} + +DashingCircleEffect::DashingCircleEffect(GrColor color, + AAMode aaMode, + const SkMatrix& localMatrix, + bool usesLocalCoords) + : fColor(color) + , fLocalMatrix(localMatrix) + , fUsesLocalCoords(usesLocalCoords) + , fAAMode(aaMode) { + this->initClassID<DashingCircleEffect>(); + fInPosition = &this->addVertexAttrib("inPosition", kVec2f_GrVertexAttribType); + fInDashParams = &this->addVertexAttrib("inDashParams", kVec3f_GrVertexAttribType); + fInCircleParams = &this->addVertexAttrib("inCircleParams", kVec2f_GrVertexAttribType); +} + +GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DashingCircleEffect); + +sk_sp<GrGeometryProcessor> DashingCircleEffect::TestCreate(GrProcessorTestData* d) { + AAMode aaMode = static_cast<AAMode>(d->fRandom->nextULessThan(GrDashOp::kAAModeCnt)); + return DashingCircleEffect::Make(GrRandomColor(d->fRandom), + aaMode, GrTest::TestMatrix(d->fRandom), + d->fRandom->nextBool()); +} + +////////////////////////////////////////////////////////////////////////////// + +class GLDashingLineEffect; + +/* + * This effect will draw a dashed line. The width of the dash is given by the strokeWidth and the + * length and spacing by the DashInfo. Both of the previous two parameters are in device space. + * This effect also requires the setting of a vec2 vertex attribute for the the four corners of the + * bounding rect. This attribute is the "dash position" of each vertex. In other words it is the + * vertex coords (in device space) if we transform the line to be horizontal, with the start of + * line at the origin then shifted to the right by half the off interval. The line then goes in the + * positive x direction. + */ +class DashingLineEffect : public GrGeometryProcessor { +public: + typedef SkPathEffect::DashInfo DashInfo; + + static sk_sp<GrGeometryProcessor> Make(GrColor, + AAMode aaMode, + const SkMatrix& localMatrix, + bool usesLocalCoords); + + const char* name() const override { return "DashingEffect"; } + + const Attribute* inPosition() const { return fInPosition; } + + const Attribute* inDashParams() const { return fInDashParams; } + + const Attribute* inRectParams() const { return fInRectParams; } + + AAMode aaMode() const { return fAAMode; } + + GrColor color() const { return fColor; } + + bool colorIgnored() const { return GrColor_ILLEGAL == fColor; } + + const SkMatrix& localMatrix() const { return fLocalMatrix; } + + bool usesLocalCoords() const { return fUsesLocalCoords; } + + void getGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override; + + GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override; + +private: + DashingLineEffect(GrColor, AAMode aaMode, const SkMatrix& localMatrix, + bool usesLocalCoords); + + GrColor fColor; + SkMatrix fLocalMatrix; + bool fUsesLocalCoords; + AAMode fAAMode; + const Attribute* fInPosition; + const Attribute* fInDashParams; + const Attribute* fInRectParams; + + GR_DECLARE_GEOMETRY_PROCESSOR_TEST; + + typedef GrGeometryProcessor INHERITED; +}; + +////////////////////////////////////////////////////////////////////////////// + +class GLDashingLineEffect : public GrGLSLGeometryProcessor { +public: + GLDashingLineEffect(); + + void onEmitCode(EmitArgs&, GrGPArgs*) override; + + static inline void GenKey(const GrGeometryProcessor&, + const GrShaderCaps&, + GrProcessorKeyBuilder*); + + void setData(const GrGLSLProgramDataManager&, const GrPrimitiveProcessor&, + FPCoordTransformIter&& iter) override; + +private: + GrColor fColor; + UniformHandle fColorUniform; + typedef GrGLSLGeometryProcessor INHERITED; +}; + +GLDashingLineEffect::GLDashingLineEffect() { + fColor = GrColor_ILLEGAL; +} + +void GLDashingLineEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) { + const DashingLineEffect& de = args.fGP.cast<DashingLineEffect>(); + + GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; + GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; + GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; + + // emit attributes + varyingHandler->emitAttributes(de); + + // XY refers to dashPos, Z is the dash interval length + GrGLSLVertToFrag inDashParams(kVec3f_GrSLType); + varyingHandler->addVarying("DashParams", &inDashParams, GrSLPrecision::kHigh_GrSLPrecision); + vertBuilder->codeAppendf("%s = %s;", inDashParams.vsOut(), de.inDashParams()->fName); + + // The rect uniform's xyzw refer to (left + 0.5, top + 0.5, right - 0.5, bottom - 0.5), + // respectively. + GrGLSLVertToFrag inRectParams(kVec4f_GrSLType); + varyingHandler->addVarying("RectParams", &inRectParams, GrSLPrecision::kHigh_GrSLPrecision); + vertBuilder->codeAppendf("%s = %s;", inRectParams.vsOut(), de.inRectParams()->fName); + + GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder; + // Setup pass through color + if (!de.colorIgnored()) { + this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor, &fColorUniform); + } + + // Setup position + this->setupPosition(vertBuilder, gpArgs, de.inPosition()->fName); + + // emit transforms + this->emitTransforms(vertBuilder, + varyingHandler, + uniformHandler, + gpArgs->fPositionVar, + de.inPosition()->fName, + de.localMatrix(), + args.fFPCoordTransformHandler); + + // transforms all points so that we can compare them to our test rect + fragBuilder->codeAppendf("float xShifted = %s.x - floor(%s.x / %s.z) * %s.z;", + inDashParams.fsIn(), inDashParams.fsIn(), inDashParams.fsIn(), + inDashParams.fsIn()); + fragBuilder->codeAppendf("vec2 fragPosShifted = vec2(xShifted, %s.y);", inDashParams.fsIn()); + if (de.aaMode() == AAMode::kCoverage) { + // The amount of coverage removed in x and y by the edges is computed as a pair of negative + // numbers, xSub and ySub. + fragBuilder->codeAppend("float xSub, ySub;"); + fragBuilder->codeAppendf("xSub = min(fragPosShifted.x - %s.x, 0.0);", inRectParams.fsIn()); + fragBuilder->codeAppendf("xSub += min(%s.z - fragPosShifted.x, 0.0);", inRectParams.fsIn()); + fragBuilder->codeAppendf("ySub = min(fragPosShifted.y - %s.y, 0.0);", inRectParams.fsIn()); + fragBuilder->codeAppendf("ySub += min(%s.w - fragPosShifted.y, 0.0);", inRectParams.fsIn()); + // Now compute coverage in x and y and multiply them to get the fraction of the pixel + // covered. + fragBuilder->codeAppendf( + "float alpha = (1.0 + max(xSub, -1.0)) * (1.0 + max(ySub, -1.0));"); + } else if (de.aaMode() == AAMode::kCoverageWithMSAA) { + // For MSAA, we don't modulate the alpha by the Y distance, since MSAA coverage will handle + // AA on the the top and bottom edges. The shader is only responsible for intra-dash alpha. + fragBuilder->codeAppend("float xSub;"); + fragBuilder->codeAppendf("xSub = min(fragPosShifted.x - %s.x, 0.0);", inRectParams.fsIn()); + fragBuilder->codeAppendf("xSub += min(%s.z - fragPosShifted.x, 0.0);", inRectParams.fsIn()); + // Now compute coverage in x to get the fraction of the pixel covered. + fragBuilder->codeAppendf("float alpha = (1.0 + max(xSub, -1.0));"); + } else { + // Assuming the bounding geometry is tight so no need to check y values + fragBuilder->codeAppendf("float alpha = 1.0;"); + fragBuilder->codeAppendf("alpha *= (fragPosShifted.x - %s.x) > -0.5 ? 1.0 : 0.0;", + inRectParams.fsIn()); + fragBuilder->codeAppendf("alpha *= (%s.z - fragPosShifted.x) >= -0.5 ? 1.0 : 0.0;", + inRectParams.fsIn()); + } + fragBuilder->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage); +} + +void GLDashingLineEffect::setData(const GrGLSLProgramDataManager& pdman, + const GrPrimitiveProcessor& processor, + FPCoordTransformIter&& transformIter) { + const DashingLineEffect& de = processor.cast<DashingLineEffect>(); + if (de.color() != fColor) { + float c[4]; + GrColorToRGBAFloat(de.color(), c); + pdman.set4fv(fColorUniform, 1, c); + fColor = de.color(); + } + this->setTransformDataHelper(de.localMatrix(), pdman, &transformIter); +} + +void GLDashingLineEffect::GenKey(const GrGeometryProcessor& gp, + const GrShaderCaps&, + GrProcessorKeyBuilder* b) { + const DashingLineEffect& de = gp.cast<DashingLineEffect>(); + uint32_t key = 0; + key |= de.usesLocalCoords() && de.localMatrix().hasPerspective() ? 0x1 : 0x0; + key |= de.colorIgnored() ? 0x2 : 0x0; + key |= static_cast<int>(de.aaMode()) << 8; + b->add32(key); +} + +////////////////////////////////////////////////////////////////////////////// + +sk_sp<GrGeometryProcessor> DashingLineEffect::Make(GrColor color, + AAMode aaMode, + const SkMatrix& localMatrix, + bool usesLocalCoords) { + return sk_sp<GrGeometryProcessor>( + new DashingLineEffect(color, aaMode, localMatrix, usesLocalCoords)); +} + +void DashingLineEffect::getGLSLProcessorKey(const GrShaderCaps& caps, + GrProcessorKeyBuilder* b) const { + GLDashingLineEffect::GenKey(*this, caps, b); +} + +GrGLSLPrimitiveProcessor* DashingLineEffect::createGLSLInstance(const GrShaderCaps&) const { + return new GLDashingLineEffect(); +} + +DashingLineEffect::DashingLineEffect(GrColor color, + AAMode aaMode, + const SkMatrix& localMatrix, + bool usesLocalCoords) + : fColor(color) + , fLocalMatrix(localMatrix) + , fUsesLocalCoords(usesLocalCoords) + , fAAMode(aaMode) { + this->initClassID<DashingLineEffect>(); + fInPosition = &this->addVertexAttrib("inPosition", kVec2f_GrVertexAttribType); + fInDashParams = &this->addVertexAttrib("inDashParams", kVec3f_GrVertexAttribType); + fInRectParams = &this->addVertexAttrib("inRect", kVec4f_GrVertexAttribType); +} + +GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DashingLineEffect); + +sk_sp<GrGeometryProcessor> DashingLineEffect::TestCreate(GrProcessorTestData* d) { + AAMode aaMode = static_cast<AAMode>(d->fRandom->nextULessThan(GrDashOp::kAAModeCnt)); + return DashingLineEffect::Make(GrRandomColor(d->fRandom), + aaMode, GrTest::TestMatrix(d->fRandom), + d->fRandom->nextBool()); +} + +////////////////////////////////////////////////////////////////////////////// + +static sk_sp<GrGeometryProcessor> make_dash_gp(GrColor color, + AAMode aaMode, + DashCap cap, + const SkMatrix& viewMatrix, + bool usesLocalCoords) { + SkMatrix invert; + if (usesLocalCoords && !viewMatrix.invert(&invert)) { + SkDebugf("Failed to invert\n"); + return nullptr; + } + + switch (cap) { + case kRound_DashCap: + return DashingCircleEffect::Make(color, aaMode, invert, usesLocalCoords); + case kNonRound_DashCap: + return DashingLineEffect::Make(color, aaMode, invert, usesLocalCoords); + } + return nullptr; +} + +///////////////////////////////////////////////////////////////////////////////////////////////// + +#ifdef GR_TEST_UTILS + +DRAW_BATCH_TEST_DEFINE(DashOp) { + GrColor color = GrRandomColor(random); + SkMatrix viewMatrix = GrTest::TestMatrixPreservesRightAngles(random); + AAMode aaMode = static_cast<AAMode>(random->nextULessThan(GrDashOp::kAAModeCnt)); + + // We can only dash either horizontal or vertical lines + SkPoint pts[2]; + if (random->nextBool()) { + // vertical + pts[0].fX = 1.f; + pts[0].fY = random->nextF() * 10.f; + pts[1].fX = 1.f; + pts[1].fY = random->nextF() * 10.f; + } else { + // horizontal + pts[0].fX = random->nextF() * 10.f; + pts[0].fY = 1.f; + pts[1].fX = random->nextF() * 10.f; + pts[1].fY = 1.f; + } + + // pick random cap + SkPaint::Cap cap = SkPaint::Cap(random->nextULessThan(SkPaint::kCapCount)); + + SkScalar intervals[2]; + + // We can only dash with the following intervals + enum Intervals { + kOpenOpen_Intervals , + kOpenClose_Intervals, + kCloseOpen_Intervals, + }; + + Intervals intervalType = SkPaint::kRound_Cap ? + kOpenClose_Intervals : + Intervals(random->nextULessThan(kCloseOpen_Intervals + 1)); + static const SkScalar kIntervalMin = 0.1f; + static const SkScalar kIntervalMax = 10.f; + switch (intervalType) { + case kOpenOpen_Intervals: + intervals[0] = random->nextRangeScalar(kIntervalMin, kIntervalMax); + intervals[1] = random->nextRangeScalar(kIntervalMin, kIntervalMax); + break; + case kOpenClose_Intervals: + intervals[0] = 0.f; + intervals[1] = random->nextRangeScalar(kIntervalMin, kIntervalMax); + break; + case kCloseOpen_Intervals: + intervals[0] = random->nextRangeScalar(kIntervalMin, kIntervalMax); + intervals[1] = 0.f; + break; + + } + + // phase is 0 < sum (i0, i1) + SkScalar phase = random->nextRangeScalar(0, intervals[0] + intervals[1]); + + SkPaint p; + p.setStyle(SkPaint::kStroke_Style); + p.setStrokeWidth(SkIntToScalar(1)); + p.setStrokeCap(cap); + p.setPathEffect(GrTest::TestDashPathEffect::Make(intervals, 2, phase)); + + GrStyle style(p); + + return GrDashOp::MakeDashLineOp(color, viewMatrix, pts, aaMode, style).release(); +} + +#endif |