1 /*
2 * Copyright 2015 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 "GrDashLinePathRenderer.h"
9 #include "GrAuditTrail.h"
10 #include "GrGpu.h"
11 #include "GrRenderTargetContext.h"
12 #include "GrShape.h"
13 #include "ops/GrDashOp.h"
14 #include "ops/GrMeshDrawOp.h"
15
16 GrPathRenderer::CanDrawPath
onCanDrawPath(const CanDrawPathArgs & args) const17 GrDashLinePathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const {
18 SkPoint pts[2];
19 bool inverted;
20 if (args.fShape->style().isDashed() && args.fShape->asLine(pts, &inverted)) {
21 if (args.fAAType == GrAAType::kMixedSamples) {
22 return CanDrawPath::kNo;
23 }
24 // We should never have an inverse dashed case.
25 SkASSERT(!inverted);
26 if (!GrDashOp::CanDrawDashLine(pts, args.fShape->style(), *args.fViewMatrix)) {
27 return CanDrawPath::kNo;
28 }
29 return CanDrawPath::kYes;
30 }
31 return CanDrawPath::kNo;
32 }
33
onDrawPath(const DrawPathArgs & args)34 bool GrDashLinePathRenderer::onDrawPath(const DrawPathArgs& args) {
35 GR_AUDIT_TRAIL_AUTO_FRAME(args.fRenderTargetContext->auditTrail(),
36 "GrDashLinePathRenderer::onDrawPath");
37 GrDashOp::AAMode aaMode = GrDashOp::AAMode::kNone;
38 switch (args.fAAType) {
39 case GrAAType::kNone:
40 break;
41 case GrAAType::kCoverage:
42 case GrAAType::kMixedSamples:
43 aaMode = GrDashOp::AAMode::kCoverage;
44 break;
45 case GrAAType::kMSAA:
46 // In this mode we will use aa between dashes but the outer border uses MSAA. Otherwise,
47 // we can wind up with external edges antialiased and internal edges unantialiased.
48 aaMode = GrDashOp::AAMode::kCoverageWithMSAA;
49 break;
50 }
51 SkPoint pts[2];
52 SkAssertResult(args.fShape->asLine(pts, nullptr));
53 std::unique_ptr<GrDrawOp> op =
54 GrDashOp::MakeDashLineOp(args.fContext, std::move(args.fPaint), *args.fViewMatrix, pts,
55 aaMode, args.fShape->style(), args.fUserStencilSettings);
56 if (!op) {
57 return false;
58 }
59 args.fRenderTargetContext->addDrawOp(*args.fClip, std::move(op));
60 return true;
61 }
62