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
10 #include "GrAuditTrail.h"
11 #include "GrGpu.h"
12 #include "GrPipelineBuilder.h"
13 #include "ops/GrDashOp.h"
14 #include "ops/GrMeshDrawOp.h"
15
onCanDrawPath(const CanDrawPathArgs & args) const16 bool GrDashLinePathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const {
17 SkPoint pts[2];
18 bool inverted;
19 if (args.fShape->style().isDashed() && args.fShape->asLine(pts, &inverted)) {
20 if (args.fAAType == GrAAType::kMixedSamples) {
21 return false;
22 }
23 // We should never have an inverse dashed case.
24 SkASSERT(!inverted);
25 return GrDashOp::CanDrawDashLine(pts, args.fShape->style(), *args.fViewMatrix);
26 }
27 return false;
28 }
29
onDrawPath(const DrawPathArgs & args)30 bool GrDashLinePathRenderer::onDrawPath(const DrawPathArgs& args) {
31 GR_AUDIT_TRAIL_AUTO_FRAME(args.fRenderTargetContext->auditTrail(),
32 "GrDashLinePathRenderer::onDrawPath");
33 GrDashOp::AAMode aaMode = GrDashOp::AAMode::kNone;
34 switch (args.fAAType) {
35 case GrAAType::kNone:
36 break;
37 case GrAAType::kCoverage:
38 case GrAAType::kMixedSamples:
39 aaMode = GrDashOp::AAMode::kCoverage;
40 break;
41 case GrAAType::kMSAA:
42 // In this mode we will use aa between dashes but the outer border uses MSAA. Otherwise,
43 // we can wind up with external edges antialiased and internal edges unantialiased.
44 aaMode = GrDashOp::AAMode::kCoverageWithMSAA;
45 break;
46 }
47 SkPoint pts[2];
48 SkAssertResult(args.fShape->asLine(pts, nullptr));
49 std::unique_ptr<GrMeshDrawOp> op = GrDashOp::MakeDashLineOp(
50 args.fPaint.getColor(), *args.fViewMatrix, pts, aaMode, args.fShape->style());
51 if (!op) {
52 return false;
53 }
54
55 GrPipelineBuilder pipelineBuilder(std::move(args.fPaint), args.fAAType);
56 pipelineBuilder.setUserStencil(args.fUserStencilSettings);
57
58 args.fRenderTargetContext->addMeshDrawOp(pipelineBuilder, *args.fClip, std::move(op));
59 return true;
60 }
61