| /* | |
| * Copyright 2012 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| #include "GrAAConvexPathRenderer.h" | |
| #include "GrAAConvexTessellator.h" | |
| #include "GrCaps.h" | |
| #include "GrContext.h" | |
| #include "GrDefaultGeoProcFactory.h" | |
| #include "GrDrawOpTest.h" | |
| #include "GrGeometryProcessor.h" | |
| #include "GrOpFlushState.h" | |
| #include "GrPathUtils.h" | |
| #include "GrProcessor.h" | |
| #include "GrRenderTargetContext.h" | |
| #include "GrShape.h" | |
| #include "GrSimpleMeshDrawOpHelper.h" | |
| #include "SkGeometry.h" | |
| #include "SkPathPriv.h" | |
| #include "SkPointPriv.h" | |
| #include "SkString.h" | |
| #include "SkTraceEvent.h" | |
| #include "SkTypes.h" | |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" | |
| #include "glsl/GrGLSLGeometryProcessor.h" | |
| #include "glsl/GrGLSLProgramDataManager.h" | |
| #include "glsl/GrGLSLUniformHandler.h" | |
| #include "glsl/GrGLSLVarying.h" | |
| #include "glsl/GrGLSLVertexGeoBuilder.h" | |
| #include "ops/GrMeshDrawOp.h" | |
| GrAAConvexPathRenderer::GrAAConvexPathRenderer() { | |
| } | |
| struct Segment { | |
| enum { | |
| // These enum values are assumed in member functions below. | |
| kLine = 0, | |
| kQuad = 1, | |
| } fType; | |
| // line uses one pt, quad uses 2 pts | |
| SkPoint fPts[2]; | |
| // normal to edge ending at each pt | |
| SkVector fNorms[2]; | |
| // is the corner where the previous segment meets this segment | |
| // sharp. If so, fMid is a normalized bisector facing outward. | |
| SkVector fMid; | |
| int countPoints() { | |
| GR_STATIC_ASSERT(0 == kLine && 1 == kQuad); | |
| return fType + 1; | |
| } | |
| const SkPoint& endPt() const { | |
| GR_STATIC_ASSERT(0 == kLine && 1 == kQuad); | |
| return fPts[fType]; | |
| } | |
| const SkPoint& endNorm() const { | |
| GR_STATIC_ASSERT(0 == kLine && 1 == kQuad); | |
| return fNorms[fType]; | |
| } | |
| }; | |
| typedef SkTArray<Segment, true> SegmentArray; | |
| static bool center_of_mass(const SegmentArray& segments, SkPoint* c) { | |
| SkScalar area = 0; | |
| SkPoint center = {0, 0}; | |
| int count = segments.count(); | |
| SkPoint p0 = {0, 0}; | |
| if (count > 2) { | |
| // We translate the polygon so that the first point is at the origin. | |
| // This avoids some precision issues with small area polygons far away | |
| // from the origin. | |
| p0 = segments[0].endPt(); | |
| SkPoint pi; | |
| SkPoint pj; | |
| // the first and last iteration of the below loop would compute | |
| // zeros since the starting / ending point is (0,0). So instead we start | |
| // at i=1 and make the last iteration i=count-2. | |
| pj = segments[1].endPt() - p0; | |
| for (int i = 1; i < count - 1; ++i) { | |
| pi = pj; | |
| pj = segments[i + 1].endPt() - p0; | |
| SkScalar t = SkPoint::CrossProduct(pi, pj); | |
| area += t; | |
| center.fX += (pi.fX + pj.fX) * t; | |
| center.fY += (pi.fY + pj.fY) * t; | |
| } | |
| } | |
| // If the poly has no area then we instead return the average of | |
| // its points. | |
| if (SkScalarNearlyZero(area)) { | |
| SkPoint avg; | |
| avg.set(0, 0); | |
| for (int i = 0; i < count; ++i) { | |
| const SkPoint& pt = segments[i].endPt(); | |
| avg.fX += pt.fX; | |
| avg.fY += pt.fY; | |
| } | |
| SkScalar denom = SK_Scalar1 / count; | |
| avg.scale(denom); | |
| *c = avg; | |
| } else { | |
| area *= 3; | |
| area = SkScalarInvert(area); | |
| center.scale(area); | |
| // undo the translate of p0 to the origin. | |
| *c = center + p0; | |
| } | |
| return !SkScalarIsNaN(c->fX) && !SkScalarIsNaN(c->fY) && c->isFinite(); | |
| } | |
| static bool compute_vectors(SegmentArray* segments, | |
| SkPoint* fanPt, | |
| SkPathPriv::FirstDirection dir, | |
| int* vCount, | |
| int* iCount) { | |
| if (!center_of_mass(*segments, fanPt)) { | |
| return false; | |
| } | |
| int count = segments->count(); | |
| // Make the normals point towards the outside | |
| SkPointPriv::Side normSide; | |
| if (dir == SkPathPriv::kCCW_FirstDirection) { | |
| normSide = SkPointPriv::kRight_Side; | |
| } else { | |
| normSide = SkPointPriv::kLeft_Side; | |
| } | |
| int64_t vCount64 = 0; | |
| int64_t iCount64 = 0; | |
| // compute normals at all points | |
| for (int a = 0; a < count; ++a) { | |
| Segment& sega = (*segments)[a]; | |
| int b = (a + 1) % count; | |
| Segment& segb = (*segments)[b]; | |
| const SkPoint* prevPt = &sega.endPt(); | |
| int n = segb.countPoints(); | |
| for (int p = 0; p < n; ++p) { | |
| segb.fNorms[p] = segb.fPts[p] - *prevPt; | |
| segb.fNorms[p].normalize(); | |
| SkPointPriv::SetOrthog(&segb.fNorms[p], segb.fNorms[p], normSide); | |
| prevPt = &segb.fPts[p]; | |
| } | |
| if (Segment::kLine == segb.fType) { | |
| vCount64 += 5; | |
| iCount64 += 9; | |
| } else { | |
| vCount64 += 6; | |
| iCount64 += 12; | |
| } | |
| } | |
| // compute mid-vectors where segments meet. TODO: Detect shallow corners | |
| // and leave out the wedges and close gaps by stitching segments together. | |
| for (int a = 0; a < count; ++a) { | |
| const Segment& sega = (*segments)[a]; | |
| int b = (a + 1) % count; | |
| Segment& segb = (*segments)[b]; | |
| segb.fMid = segb.fNorms[0] + sega.endNorm(); | |
| segb.fMid.normalize(); | |
| // corner wedges | |
| vCount64 += 4; | |
| iCount64 += 6; | |
| } | |
| if (vCount64 > SK_MaxS32 || iCount64 > SK_MaxS32) { | |
| return false; | |
| } | |
| *vCount = vCount64; | |
| *iCount = iCount64; | |
| return true; | |
| } | |
| struct DegenerateTestData { | |
| DegenerateTestData() { fStage = kInitial; } | |
| bool isDegenerate() const { return kNonDegenerate != fStage; } | |
| enum { | |
| kInitial, | |
| kPoint, | |
| kLine, | |
| kNonDegenerate | |
| } fStage; | |
| SkPoint fFirstPoint; | |
| SkVector fLineNormal; | |
| SkScalar fLineC; | |
| }; | |
| static const SkScalar kClose = (SK_Scalar1 / 16); | |
| static const SkScalar kCloseSqd = kClose * kClose; | |
| static void update_degenerate_test(DegenerateTestData* data, const SkPoint& pt) { | |
| switch (data->fStage) { | |
| case DegenerateTestData::kInitial: | |
| data->fFirstPoint = pt; | |
| data->fStage = DegenerateTestData::kPoint; | |
| break; | |
| case DegenerateTestData::kPoint: | |
| if (SkPointPriv::DistanceToSqd(pt, data->fFirstPoint) > kCloseSqd) { | |
| data->fLineNormal = pt - data->fFirstPoint; | |
| data->fLineNormal.normalize(); | |
| SkPointPriv::SetOrthog(&data->fLineNormal, data->fLineNormal); | |
| data->fLineC = -data->fLineNormal.dot(data->fFirstPoint); | |
| data->fStage = DegenerateTestData::kLine; | |
| } | |
| break; | |
| case DegenerateTestData::kLine: | |
| if (SkScalarAbs(data->fLineNormal.dot(pt) + data->fLineC) > kClose) { | |
| data->fStage = DegenerateTestData::kNonDegenerate; | |
| } | |
| case DegenerateTestData::kNonDegenerate: | |
| break; | |
| default: | |
| SK_ABORT("Unexpected degenerate test stage."); | |
| } | |
| } | |
| static inline bool get_direction(const SkPath& path, const SkMatrix& m, | |
| SkPathPriv::FirstDirection* dir) { | |
| if (!SkPathPriv::CheapComputeFirstDirection(path, dir)) { | |
| return false; | |
| } | |
| // check whether m reverses the orientation | |
| SkASSERT(!m.hasPerspective()); | |
| SkScalar det2x2 = m.get(SkMatrix::kMScaleX) * m.get(SkMatrix::kMScaleY) - | |
| m.get(SkMatrix::kMSkewX) * m.get(SkMatrix::kMSkewY); | |
| if (det2x2 < 0) { | |
| *dir = SkPathPriv::OppositeFirstDirection(*dir); | |
| } | |
| return true; | |
| } | |
| static inline void add_line_to_segment(const SkPoint& pt, | |
| SegmentArray* segments) { | |
| segments->push_back(); | |
| segments->back().fType = Segment::kLine; | |
| segments->back().fPts[0] = pt; | |
| } | |
| static inline void add_quad_segment(const SkPoint pts[3], | |
| SegmentArray* segments) { | |
| if (SkPointPriv::DistanceToSqd(pts[0], pts[1]) < kCloseSqd || | |
| SkPointPriv::DistanceToSqd(pts[1], pts[2]) < kCloseSqd) { | |
| if (pts[0] != pts[2]) { | |
| add_line_to_segment(pts[2], segments); | |
| } | |
| } else { | |
| segments->push_back(); | |
| segments->back().fType = Segment::kQuad; | |
| segments->back().fPts[0] = pts[1]; | |
| segments->back().fPts[1] = pts[2]; | |
| } | |
| } | |
| static inline void add_cubic_segments(const SkPoint pts[4], | |
| SkPathPriv::FirstDirection dir, | |
| SegmentArray* segments) { | |
| SkSTArray<15, SkPoint, true> quads; | |
| GrPathUtils::convertCubicToQuadsConstrainToTangents(pts, SK_Scalar1, dir, &quads); | |
| int count = quads.count(); | |
| for (int q = 0; q < count; q += 3) { | |
| add_quad_segment(&quads[q], segments); | |
| } | |
| } | |
| static bool get_segments(const SkPath& path, | |
| const SkMatrix& m, | |
| SegmentArray* segments, | |
| SkPoint* fanPt, | |
| int* vCount, | |
| int* iCount) { | |
| SkPath::Iter iter(path, true); | |
| // This renderer over-emphasizes very thin path regions. We use the distance | |
| // to the path from the sample to compute coverage. Every pixel intersected | |
| // by the path will be hit and the maximum distance is sqrt(2)/2. We don't | |
| // notice that the sample may be close to a very thin area of the path and | |
| // thus should be very light. This is particularly egregious for degenerate | |
| // line paths. We detect paths that are very close to a line (zero area) and | |
| // draw nothing. | |
| DegenerateTestData degenerateData; | |
| SkPathPriv::FirstDirection dir; | |
| // get_direction can fail for some degenerate paths. | |
| if (!get_direction(path, m, &dir)) { | |
| return false; | |
| } | |
| for (;;) { | |
| SkPoint pts[4]; | |
| SkPath::Verb verb = iter.next(pts, true, true); | |
| switch (verb) { | |
| case SkPath::kMove_Verb: | |
| m.mapPoints(pts, 1); | |
| update_degenerate_test(°enerateData, pts[0]); | |
| break; | |
| case SkPath::kLine_Verb: { | |
| m.mapPoints(&pts[1], 1); | |
| update_degenerate_test(°enerateData, pts[1]); | |
| add_line_to_segment(pts[1], segments); | |
| break; | |
| } | |
| case SkPath::kQuad_Verb: | |
| m.mapPoints(pts, 3); | |
| update_degenerate_test(°enerateData, pts[1]); | |
| update_degenerate_test(°enerateData, pts[2]); | |
| add_quad_segment(pts, segments); | |
| break; | |
| case SkPath::kConic_Verb: { | |
| m.mapPoints(pts, 3); | |
| SkScalar weight = iter.conicWeight(); | |
| SkAutoConicToQuads converter; | |
| const SkPoint* quadPts = converter.computeQuads(pts, weight, 0.5f); | |
| for (int i = 0; i < converter.countQuads(); ++i) { | |
| update_degenerate_test(°enerateData, quadPts[2*i + 1]); | |
| update_degenerate_test(°enerateData, quadPts[2*i + 2]); | |
| add_quad_segment(quadPts + 2*i, segments); | |
| } | |
| break; | |
| } | |
| case SkPath::kCubic_Verb: { | |
| m.mapPoints(pts, 4); | |
| update_degenerate_test(°enerateData, pts[1]); | |
| update_degenerate_test(°enerateData, pts[2]); | |
| update_degenerate_test(°enerateData, pts[3]); | |
| add_cubic_segments(pts, dir, segments); | |
| break; | |
| }; | |
| case SkPath::kDone_Verb: | |
| if (degenerateData.isDegenerate()) { | |
| return false; | |
| } else { | |
| return compute_vectors(segments, fanPt, dir, vCount, iCount); | |
| } | |
| default: | |
| break; | |
| } | |
| } | |
| } | |
| struct QuadVertex { | |
| SkPoint fPos; | |
| GrColor fColor; | |
| SkPoint fUV; | |
| SkScalar fD0; | |
| SkScalar fD1; | |
| }; | |
| struct Draw { | |
| Draw() : fVertexCnt(0), fIndexCnt(0) {} | |
| int fVertexCnt; | |
| int fIndexCnt; | |
| }; | |
| typedef SkTArray<Draw, true> DrawArray; | |
| static void create_vertices(const SegmentArray& segments, | |
| const SkPoint& fanPt, | |
| GrColor color, | |
| DrawArray* draws, | |
| QuadVertex* verts, | |
| uint16_t* idxs) { | |
| Draw* draw = &draws->push_back(); | |
| // alias just to make vert/index assignments easier to read. | |
| int* v = &draw->fVertexCnt; | |
| int* i = &draw->fIndexCnt; | |
| int count = segments.count(); | |
| for (int a = 0; a < count; ++a) { | |
| const Segment& sega = segments[a]; | |
| int b = (a + 1) % count; | |
| const Segment& segb = segments[b]; | |
| // Check whether adding the verts for this segment to the current draw would cause index | |
| // values to overflow. | |
| int vCount = 4; | |
| if (Segment::kLine == segb.fType) { | |
| vCount += 5; | |
| } else { | |
| vCount += 6; | |
| } | |
| if (draw->fVertexCnt + vCount > (1 << 16)) { | |
| verts += *v; | |
| idxs += *i; | |
| draw = &draws->push_back(); | |
| v = &draw->fVertexCnt; | |
| i = &draw->fIndexCnt; | |
| } | |
| // FIXME: These tris are inset in the 1 unit arc around the corner | |
| verts[*v + 0].fPos = sega.endPt(); | |
| verts[*v + 1].fPos = verts[*v + 0].fPos + sega.endNorm(); | |
| verts[*v + 2].fPos = verts[*v + 0].fPos + segb.fMid; | |
| verts[*v + 3].fPos = verts[*v + 0].fPos + segb.fNorms[0]; | |
| verts[*v + 0].fColor = color; | |
| verts[*v + 1].fColor = color; | |
| verts[*v + 2].fColor = color; | |
| verts[*v + 3].fColor = color; | |
| verts[*v + 0].fUV.set(0,0); | |
| verts[*v + 1].fUV.set(0,-SK_Scalar1); | |
| verts[*v + 2].fUV.set(0,-SK_Scalar1); | |
| verts[*v + 3].fUV.set(0,-SK_Scalar1); | |
| verts[*v + 0].fD0 = verts[*v + 0].fD1 = -SK_Scalar1; | |
| verts[*v + 1].fD0 = verts[*v + 1].fD1 = -SK_Scalar1; | |
| verts[*v + 2].fD0 = verts[*v + 2].fD1 = -SK_Scalar1; | |
| verts[*v + 3].fD0 = verts[*v + 3].fD1 = -SK_Scalar1; | |
| idxs[*i + 0] = *v + 0; | |
| idxs[*i + 1] = *v + 2; | |
| idxs[*i + 2] = *v + 1; | |
| idxs[*i + 3] = *v + 0; | |
| idxs[*i + 4] = *v + 3; | |
| idxs[*i + 5] = *v + 2; | |
| *v += 4; | |
| *i += 6; | |
| if (Segment::kLine == segb.fType) { | |
| verts[*v + 0].fPos = fanPt; | |
| verts[*v + 1].fPos = sega.endPt(); | |
| verts[*v + 2].fPos = segb.fPts[0]; | |
| verts[*v + 3].fPos = verts[*v + 1].fPos + segb.fNorms[0]; | |
| verts[*v + 4].fPos = verts[*v + 2].fPos + segb.fNorms[0]; | |
| verts[*v + 0].fColor = color; | |
| verts[*v + 1].fColor = color; | |
| verts[*v + 2].fColor = color; | |
| verts[*v + 3].fColor = color; | |
| verts[*v + 4].fColor = color; | |
| // we draw the line edge as a degenerate quad (u is 0, v is the | |
| // signed distance to the edge) | |
| SkScalar dist = SkPointPriv::DistanceToLineBetween(fanPt, verts[*v + 1].fPos, | |
| verts[*v + 2].fPos); | |
| verts[*v + 0].fUV.set(0, dist); | |
| verts[*v + 1].fUV.set(0, 0); | |
| verts[*v + 2].fUV.set(0, 0); | |
| verts[*v + 3].fUV.set(0, -SK_Scalar1); | |
| verts[*v + 4].fUV.set(0, -SK_Scalar1); | |
| verts[*v + 0].fD0 = verts[*v + 0].fD1 = -SK_Scalar1; | |
| verts[*v + 1].fD0 = verts[*v + 1].fD1 = -SK_Scalar1; | |
| verts[*v + 2].fD0 = verts[*v + 2].fD1 = -SK_Scalar1; | |
| verts[*v + 3].fD0 = verts[*v + 3].fD1 = -SK_Scalar1; | |
| verts[*v + 4].fD0 = verts[*v + 4].fD1 = -SK_Scalar1; | |
| idxs[*i + 0] = *v + 3; | |
| idxs[*i + 1] = *v + 1; | |
| idxs[*i + 2] = *v + 2; | |
| idxs[*i + 3] = *v + 4; | |
| idxs[*i + 4] = *v + 3; | |
| idxs[*i + 5] = *v + 2; | |
| *i += 6; | |
| // Draw the interior fan if it exists. | |
| // TODO: Detect and combine colinear segments. This will ensure we catch every case | |
| // with no interior, and that the resulting shared edge uses the same endpoints. | |
| if (count >= 3) { | |
| idxs[*i + 0] = *v + 0; | |
| idxs[*i + 1] = *v + 2; | |
| idxs[*i + 2] = *v + 1; | |
| *i += 3; | |
| } | |
| *v += 5; | |
| } else { | |
| SkPoint qpts[] = {sega.endPt(), segb.fPts[0], segb.fPts[1]}; | |
| SkVector midVec = segb.fNorms[0] + segb.fNorms[1]; | |
| midVec.normalize(); | |
| verts[*v + 0].fPos = fanPt; | |
| verts[*v + 1].fPos = qpts[0]; | |
| verts[*v + 2].fPos = qpts[2]; | |
| verts[*v + 3].fPos = qpts[0] + segb.fNorms[0]; | |
| verts[*v + 4].fPos = qpts[2] + segb.fNorms[1]; | |
| verts[*v + 5].fPos = qpts[1] + midVec; | |
| verts[*v + 0].fColor = color; | |
| verts[*v + 1].fColor = color; | |
| verts[*v + 2].fColor = color; | |
| verts[*v + 3].fColor = color; | |
| verts[*v + 4].fColor = color; | |
| verts[*v + 5].fColor = color; | |
| SkScalar c = segb.fNorms[0].dot(qpts[0]); | |
| verts[*v + 0].fD0 = -segb.fNorms[0].dot(fanPt) + c; | |
| verts[*v + 1].fD0 = 0.f; | |
| verts[*v + 2].fD0 = -segb.fNorms[0].dot(qpts[2]) + c; | |
| verts[*v + 3].fD0 = -SK_ScalarMax/100; | |
| verts[*v + 4].fD0 = -SK_ScalarMax/100; | |
| verts[*v + 5].fD0 = -SK_ScalarMax/100; | |
| c = segb.fNorms[1].dot(qpts[2]); | |
| verts[*v + 0].fD1 = -segb.fNorms[1].dot(fanPt) + c; | |
| verts[*v + 1].fD1 = -segb.fNorms[1].dot(qpts[0]) + c; | |
| verts[*v + 2].fD1 = 0.f; | |
| verts[*v + 3].fD1 = -SK_ScalarMax/100; | |
| verts[*v + 4].fD1 = -SK_ScalarMax/100; | |
| verts[*v + 5].fD1 = -SK_ScalarMax/100; | |
| GrPathUtils::QuadUVMatrix toUV(qpts); | |
| toUV.apply<6, sizeof(QuadVertex), offsetof(QuadVertex, fUV)>(verts + *v); | |
| idxs[*i + 0] = *v + 3; | |
| idxs[*i + 1] = *v + 1; | |
| idxs[*i + 2] = *v + 2; | |
| idxs[*i + 3] = *v + 4; | |
| idxs[*i + 4] = *v + 3; | |
| idxs[*i + 5] = *v + 2; | |
| idxs[*i + 6] = *v + 5; | |
| idxs[*i + 7] = *v + 3; | |
| idxs[*i + 8] = *v + 4; | |
| *i += 9; | |
| // Draw the interior fan if it exists. | |
| // TODO: Detect and combine colinear segments. This will ensure we catch every case | |
| // with no interior, and that the resulting shared edge uses the same endpoints. | |
| if (count >= 3) { | |
| idxs[*i + 0] = *v + 0; | |
| idxs[*i + 1] = *v + 2; | |
| idxs[*i + 2] = *v + 1; | |
| *i += 3; | |
| } | |
| *v += 6; | |
| } | |
| } | |
| } | |
| /////////////////////////////////////////////////////////////////////////////// | |
| /* | |
| * Quadratic specified by 0=u^2-v canonical coords. u and v are the first | |
| * two components of the vertex attribute. Coverage is based on signed | |
| * distance with negative being inside, positive outside. The edge is specified in | |
| * window space (y-down). If either the third or fourth component of the interpolated | |
| * vertex coord is > 0 then the pixel is considered outside the edge. This is used to | |
| * attempt to trim to a portion of the infinite quad. | |
| * Requires shader derivative instruction support. | |
| */ | |
| class QuadEdgeEffect : public GrGeometryProcessor { | |
| public: | |
| static sk_sp<GrGeometryProcessor> Make(const SkMatrix& localMatrix, bool usesLocalCoords) { | |
| return sk_sp<GrGeometryProcessor>(new QuadEdgeEffect(localMatrix, usesLocalCoords)); | |
| } | |
| ~QuadEdgeEffect() override {} | |
| const char* name() const override { return "QuadEdge"; } | |
| class GLSLProcessor : public GrGLSLGeometryProcessor { | |
| public: | |
| GLSLProcessor() {} | |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override { | |
| const QuadEdgeEffect& qe = args.fGP.cast<QuadEdgeEffect>(); | |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; | |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; | |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; | |
| // emit attributes | |
| varyingHandler->emitAttributes(qe); | |
| GrGLSLVarying v(kHalf4_GrSLType); | |
| varyingHandler->addVarying("QuadEdge", &v); | |
| vertBuilder->codeAppendf("%s = %s;", v.vsOut(), qe.kInQuadEdge.name()); | |
| // Setup pass through color | |
| varyingHandler->addPassThroughAttribute(qe.kInColor, args.fOutputColor); | |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; | |
| // Setup position | |
| this->writeOutputPosition(vertBuilder, gpArgs, qe.kInPosition.name()); | |
| // emit transforms | |
| this->emitTransforms(vertBuilder, | |
| varyingHandler, | |
| uniformHandler, | |
| qe.kInPosition.asShaderVar(), | |
| qe.fLocalMatrix, | |
| args.fFPCoordTransformHandler); | |
| fragBuilder->codeAppendf("half edgeAlpha;"); | |
| // keep the derivative instructions outside the conditional | |
| fragBuilder->codeAppendf("half2 duvdx = dFdx(%s.xy);", v.fsIn()); | |
| fragBuilder->codeAppendf("half2 duvdy = dFdy(%s.xy);", v.fsIn()); | |
| fragBuilder->codeAppendf("if (%s.z > 0.0 && %s.w > 0.0) {", v.fsIn(), v.fsIn()); | |
| // today we know z and w are in device space. We could use derivatives | |
| fragBuilder->codeAppendf("edgeAlpha = min(min(%s.z, %s.w) + 0.5, 1.0);", v.fsIn(), | |
| v.fsIn()); | |
| fragBuilder->codeAppendf ("} else {"); | |
| fragBuilder->codeAppendf("half2 gF = half2(2.0*%s.x*duvdx.x - duvdx.y," | |
| " 2.0*%s.x*duvdy.x - duvdy.y);", | |
| v.fsIn(), v.fsIn()); | |
| fragBuilder->codeAppendf("edgeAlpha = (%s.x*%s.x - %s.y);", v.fsIn(), v.fsIn(), | |
| v.fsIn()); | |
| fragBuilder->codeAppendf("edgeAlpha = " | |
| "saturate(0.5 - edgeAlpha / length(gF));}"); | |
| fragBuilder->codeAppendf("%s = half4(edgeAlpha);", args.fOutputCoverage); | |
| } | |
| static inline void GenKey(const GrGeometryProcessor& gp, | |
| const GrShaderCaps&, | |
| GrProcessorKeyBuilder* b) { | |
| const QuadEdgeEffect& qee = gp.cast<QuadEdgeEffect>(); | |
| b->add32(SkToBool(qee.fUsesLocalCoords && qee.fLocalMatrix.hasPerspective())); | |
| } | |
| void setData(const GrGLSLProgramDataManager& pdman, | |
| const GrPrimitiveProcessor& gp, | |
| FPCoordTransformIter&& transformIter) override { | |
| const QuadEdgeEffect& qe = gp.cast<QuadEdgeEffect>(); | |
| this->setTransformDataHelper(qe.fLocalMatrix, pdman, &transformIter); | |
| } | |
| private: | |
| typedef GrGLSLGeometryProcessor INHERITED; | |
| }; | |
| void getGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override { | |
| GLSLProcessor::GenKey(*this, caps, b); | |
| } | |
| GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override { | |
| return new GLSLProcessor(); | |
| } | |
| private: | |
| QuadEdgeEffect(const SkMatrix& localMatrix, bool usesLocalCoords) | |
| : INHERITED(kQuadEdgeEffect_ClassID) | |
| , fLocalMatrix(localMatrix) | |
| , fUsesLocalCoords(usesLocalCoords) { | |
| this->setVertexAttributeCnt(3); | |
| } | |
| const Attribute& onVertexAttribute(int i) const override { | |
| return IthAttribute(i, kInPosition, kInColor, kInQuadEdge); | |
| } | |
| static constexpr Attribute kInPosition = {"inPosition", kFloat2_GrVertexAttribType}; | |
| static constexpr Attribute kInColor = {"inColor", kUByte4_norm_GrVertexAttribType}; | |
| static constexpr Attribute kInQuadEdge = {"inQuadEdge", kHalf4_GrVertexAttribType}; | |
| SkMatrix fLocalMatrix; | |
| bool fUsesLocalCoords; | |
| GR_DECLARE_GEOMETRY_PROCESSOR_TEST | |
| typedef GrGeometryProcessor INHERITED; | |
| }; | |
| constexpr GrPrimitiveProcessor::Attribute QuadEdgeEffect::kInPosition; | |
| constexpr GrPrimitiveProcessor::Attribute QuadEdgeEffect::kInColor; | |
| constexpr GrPrimitiveProcessor::Attribute QuadEdgeEffect::kInQuadEdge; | |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(QuadEdgeEffect); | |
| #if GR_TEST_UTILS | |
| sk_sp<GrGeometryProcessor> QuadEdgeEffect::TestCreate(GrProcessorTestData* d) { | |
| // Doesn't work without derivative instructions. | |
| return d->caps()->shaderCaps()->shaderDerivativeSupport() | |
| ? QuadEdgeEffect::Make(GrTest::TestMatrix(d->fRandom), d->fRandom->nextBool()) | |
| : nullptr; | |
| } | |
| #endif | |
| /////////////////////////////////////////////////////////////////////////////// | |
| GrPathRenderer::CanDrawPath | |
| GrAAConvexPathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const { | |
| if (args.fCaps->shaderCaps()->shaderDerivativeSupport() && | |
| (GrAAType::kCoverage == args.fAAType) && args.fShape->style().isSimpleFill() && | |
| !args.fShape->inverseFilled() && args.fShape->knownToBeConvex()) { | |
| return CanDrawPath::kYes; | |
| } | |
| return CanDrawPath::kNo; | |
| } | |
| // extract the result vertices and indices from the GrAAConvexTessellator | |
| static void extract_lines_only_verts(const GrAAConvexTessellator& tess, | |
| void* vertices, | |
| size_t vertexStride, | |
| GrColor color, | |
| uint16_t* idxs, | |
| bool tweakAlphaForCoverage) { | |
| intptr_t verts = reinterpret_cast<intptr_t>(vertices); | |
| for (int i = 0; i < tess.numPts(); ++i) { | |
| *((SkPoint*)((intptr_t)verts + i * vertexStride)) = tess.point(i); | |
| } | |
| // Make 'verts' point to the colors | |
| verts += sizeof(SkPoint); | |
| for (int i = 0; i < tess.numPts(); ++i) { | |
| if (tweakAlphaForCoverage) { | |
| SkASSERT(SkScalarRoundToInt(255.0f * tess.coverage(i)) <= 255); | |
| unsigned scale = SkScalarRoundToInt(255.0f * tess.coverage(i)); | |
| GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale); | |
| *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor; | |
| } else { | |
| *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color; | |
| *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = | |
| tess.coverage(i); | |
| } | |
| } | |
| for (int i = 0; i < tess.numIndices(); ++i) { | |
| idxs[i] = tess.index(i); | |
| } | |
| } | |
| static sk_sp<GrGeometryProcessor> make_lines_only_gp(const GrShaderCaps* shaderCaps, | |
| bool tweakAlphaForCoverage, | |
| const SkMatrix& viewMatrix, | |
| bool usesLocalCoords) { | |
| using namespace GrDefaultGeoProcFactory; | |
| Coverage::Type coverageType; | |
| if (tweakAlphaForCoverage) { | |
| coverageType = Coverage::kSolid_Type; | |
| } else { | |
| coverageType = Coverage::kAttribute_Type; | |
| } | |
| LocalCoords::Type localCoordsType = | |
| usesLocalCoords ? LocalCoords::kUsePosition_Type : LocalCoords::kUnused_Type; | |
| return MakeForDeviceSpace(shaderCaps, | |
| Color::kPremulGrColorAttribute_Type, | |
| coverageType, | |
| localCoordsType, | |
| viewMatrix); | |
| } | |
| namespace { | |
| class AAConvexPathOp final : public GrMeshDrawOp { | |
| private: | |
| using Helper = GrSimpleMeshDrawOpHelperWithStencil; | |
| public: | |
| DEFINE_OP_CLASS_ID | |
| static std::unique_ptr<GrDrawOp> Make(GrContext* context, | |
| GrPaint&& paint, | |
| const SkMatrix& viewMatrix, | |
| const SkPath& path, | |
| const GrUserStencilSettings* stencilSettings) { | |
| return Helper::FactoryHelper<AAConvexPathOp>(context, std::move(paint), viewMatrix, path, | |
| stencilSettings); | |
| } | |
| AAConvexPathOp(const Helper::MakeArgs& helperArgs, GrColor color, const SkMatrix& viewMatrix, | |
| const SkPath& path, const GrUserStencilSettings* stencilSettings) | |
| : INHERITED(ClassID()), fHelper(helperArgs, GrAAType::kCoverage, stencilSettings) { | |
| fPaths.emplace_back(PathData{viewMatrix, path, color}); | |
| this->setTransformedBounds(path.getBounds(), viewMatrix, HasAABloat::kYes, IsZeroArea::kNo); | |
| fLinesOnly = SkPath::kLine_SegmentMask == path.getSegmentMasks(); | |
| } | |
| const char* name() const override { return "AAConvexPathOp"; } | |
| void visitProxies(const VisitProxyFunc& func) const override { | |
| fHelper.visitProxies(func); | |
| } | |
| SkString dumpInfo() const override { | |
| SkString string; | |
| string.appendf("Count: %d\n", fPaths.count()); | |
| string += fHelper.dumpInfo(); | |
| string += INHERITED::dumpInfo(); | |
| return string; | |
| } | |
| FixedFunctionFlags fixedFunctionFlags() const override { return fHelper.fixedFunctionFlags(); } | |
| RequiresDstTexture finalize(const GrCaps& caps, const GrAppliedClip* clip) override { | |
| return fHelper.xpRequiresDstTexture(caps, clip, GrProcessorAnalysisCoverage::kSingleChannel, | |
| &fPaths.back().fColor); | |
| } | |
| private: | |
| void prepareLinesOnlyDraws(Target* target) { | |
| // Setup GrGeometryProcessor | |
| sk_sp<GrGeometryProcessor> gp(make_lines_only_gp(target->caps().shaderCaps(), | |
| fHelper.compatibleWithAlphaAsCoverage(), | |
| fPaths.back().fViewMatrix, | |
| fHelper.usesLocalCoords())); | |
| if (!gp) { | |
| SkDebugf("Could not create GrGeometryProcessor\n"); | |
| return; | |
| } | |
| size_t vertexStride = fHelper.compatibleWithAlphaAsCoverage() | |
| ? sizeof(GrDefaultGeoProcFactory::PositionColorAttr) | |
| : sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr); | |
| SkASSERT(vertexStride == gp->debugOnly_vertexStride()); | |
| GrAAConvexTessellator tess; | |
| int instanceCount = fPaths.count(); | |
| auto pipe = fHelper.makePipeline(target); | |
| for (int i = 0; i < instanceCount; i++) { | |
| tess.rewind(); | |
| const PathData& args = fPaths[i]; | |
| if (!tess.tessellate(args.fViewMatrix, args.fPath)) { | |
| continue; | |
| } | |
| const GrBuffer* vertexBuffer; | |
| int firstVertex; | |
| void* verts = target->makeVertexSpace(vertexStride, tess.numPts(), &vertexBuffer, | |
| &firstVertex); | |
| if (!verts) { | |
| SkDebugf("Could not allocate vertices\n"); | |
| return; | |
| } | |
| const GrBuffer* indexBuffer; | |
| int firstIndex; | |
| uint16_t* idxs = target->makeIndexSpace(tess.numIndices(), &indexBuffer, &firstIndex); | |
| if (!idxs) { | |
| SkDebugf("Could not allocate indices\n"); | |
| return; | |
| } | |
| extract_lines_only_verts(tess, verts, vertexStride, args.fColor, idxs, | |
| fHelper.compatibleWithAlphaAsCoverage()); | |
| GrMesh* mesh = target->allocMesh(GrPrimitiveType::kTriangles); | |
| mesh->setIndexed(indexBuffer, tess.numIndices(), firstIndex, 0, tess.numPts() - 1, | |
| GrPrimitiveRestart::kNo); | |
| mesh->setVertexData(vertexBuffer, firstVertex); | |
| target->draw(gp, pipe.fPipeline, pipe.fFixedDynamicState, mesh); | |
| } | |
| } | |
| void onPrepareDraws(Target* target) override { | |
| #ifndef SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS | |
| if (fLinesOnly) { | |
| this->prepareLinesOnlyDraws(target); | |
| return; | |
| } | |
| #endif | |
| auto pipe = fHelper.makePipeline(target); | |
| int instanceCount = fPaths.count(); | |
| SkMatrix invert; | |
| if (fHelper.usesLocalCoords() && !fPaths.back().fViewMatrix.invert(&invert)) { | |
| return; | |
| } | |
| // Setup GrGeometryProcessor | |
| sk_sp<GrGeometryProcessor> quadProcessor( | |
| QuadEdgeEffect::Make(invert, fHelper.usesLocalCoords())); | |
| // TODO generate all segments for all paths and use one vertex buffer | |
| for (int i = 0; i < instanceCount; i++) { | |
| const PathData& args = fPaths[i]; | |
| // We use the fact that SkPath::transform path does subdivision based on | |
| // perspective. Otherwise, we apply the view matrix when copying to the | |
| // segment representation. | |
| const SkMatrix* viewMatrix = &args.fViewMatrix; | |
| // We avoid initializing the path unless we have to | |
| const SkPath* pathPtr = &args.fPath; | |
| SkTLazy<SkPath> tmpPath; | |
| if (viewMatrix->hasPerspective()) { | |
| SkPath* tmpPathPtr = tmpPath.init(*pathPtr); | |
| tmpPathPtr->setIsVolatile(true); | |
| tmpPathPtr->transform(*viewMatrix); | |
| viewMatrix = &SkMatrix::I(); | |
| pathPtr = tmpPathPtr; | |
| } | |
| int vertexCount; | |
| int indexCount; | |
| enum { | |
| kPreallocSegmentCnt = 512 / sizeof(Segment), | |
| kPreallocDrawCnt = 4, | |
| }; | |
| SkSTArray<kPreallocSegmentCnt, Segment, true> segments; | |
| SkPoint fanPt; | |
| if (!get_segments(*pathPtr, *viewMatrix, &segments, &fanPt, &vertexCount, | |
| &indexCount)) { | |
| continue; | |
| } | |
| const GrBuffer* vertexBuffer; | |
| int firstVertex; | |
| SkASSERT(sizeof(QuadVertex) == quadProcessor->debugOnly_vertexStride()); | |
| QuadVertex* verts = reinterpret_cast<QuadVertex*>(target->makeVertexSpace( | |
| sizeof(QuadVertex), vertexCount, &vertexBuffer, &firstVertex)); | |
| if (!verts) { | |
| SkDebugf("Could not allocate vertices\n"); | |
| return; | |
| } | |
| const GrBuffer* indexBuffer; | |
| int firstIndex; | |
| uint16_t *idxs = target->makeIndexSpace(indexCount, &indexBuffer, &firstIndex); | |
| if (!idxs) { | |
| SkDebugf("Could not allocate indices\n"); | |
| return; | |
| } | |
| SkSTArray<kPreallocDrawCnt, Draw, true> draws; | |
| create_vertices(segments, fanPt, args.fColor, &draws, verts, idxs); | |
| GrMesh* meshes = target->allocMeshes(draws.count()); | |
| for (int j = 0; j < draws.count(); ++j) { | |
| const Draw& draw = draws[j]; | |
| meshes[j].setPrimitiveType(GrPrimitiveType::kTriangles); | |
| meshes[j].setIndexed(indexBuffer, draw.fIndexCnt, firstIndex, 0, | |
| draw.fVertexCnt - 1, GrPrimitiveRestart::kNo); | |
| meshes[j].setVertexData(vertexBuffer, firstVertex); | |
| firstIndex += draw.fIndexCnt; | |
| firstVertex += draw.fVertexCnt; | |
| } | |
| target->draw(quadProcessor, pipe.fPipeline, pipe.fFixedDynamicState, meshes, | |
| draws.count()); | |
| } | |
| } | |
| CombineResult onCombineIfPossible(GrOp* t, const GrCaps& caps) override { | |
| AAConvexPathOp* that = t->cast<AAConvexPathOp>(); | |
| if (!fHelper.isCompatible(that->fHelper, caps, this->bounds(), that->bounds())) { | |
| return CombineResult::kCannotCombine; | |
| } | |
| if (fHelper.usesLocalCoords() && | |
| !fPaths[0].fViewMatrix.cheapEqualTo(that->fPaths[0].fViewMatrix)) { | |
| return CombineResult::kCannotCombine; | |
| } | |
| if (fLinesOnly != that->fLinesOnly) { | |
| return CombineResult::kCannotCombine; | |
| } | |
| fPaths.push_back_n(that->fPaths.count(), that->fPaths.begin()); | |
| this->joinBounds(*that); | |
| return CombineResult::kMerged; | |
| } | |
| struct PathData { | |
| SkMatrix fViewMatrix; | |
| SkPath fPath; | |
| GrColor fColor; | |
| }; | |
| Helper fHelper; | |
| SkSTArray<1, PathData, true> fPaths; | |
| bool fLinesOnly; | |
| typedef GrMeshDrawOp INHERITED; | |
| }; | |
| } // anonymous namespace | |
| bool GrAAConvexPathRenderer::onDrawPath(const DrawPathArgs& args) { | |
| GR_AUDIT_TRAIL_AUTO_FRAME(args.fRenderTargetContext->auditTrail(), | |
| "GrAAConvexPathRenderer::onDrawPath"); | |
| SkASSERT(GrFSAAType::kUnifiedMSAA != args.fRenderTargetContext->fsaaType()); | |
| SkASSERT(!args.fShape->isEmpty()); | |
| SkPath path; | |
| args.fShape->asPath(&path); | |
| std::unique_ptr<GrDrawOp> op = AAConvexPathOp::Make(args.fContext, std::move(args.fPaint), | |
| *args.fViewMatrix, | |
| path, args.fUserStencilSettings); | |
| args.fRenderTargetContext->addDrawOp(*args.fClip, std::move(op)); | |
| return true; | |
| } | |
| /////////////////////////////////////////////////////////////////////////////////////////////////// | |
| #if GR_TEST_UTILS | |
| GR_DRAW_OP_TEST_DEFINE(AAConvexPathOp) { | |
| SkMatrix viewMatrix = GrTest::TestMatrixInvertible(random); | |
| SkPath path = GrTest::TestPathConvex(random); | |
| const GrUserStencilSettings* stencilSettings = GrGetRandomStencil(random, context); | |
| return AAConvexPathOp::Make(context, std::move(paint), viewMatrix, path, stencilSettings); | |
| } | |
| #endif |