1 /*
2 * Copyright 2017 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 "SkSGMerge.h"
9
10 #include "SkCanvas.h"
11 #include "SkPathOps.h"
12
13 namespace sksg {
14
Merge(std::vector<Rec> && recs)15 Merge::Merge(std::vector<Rec>&& recs)
16 : fRecs(std::move(recs)) {
17 for (const auto& rec : fRecs) {
18 this->observeInval(rec.fGeo);
19 }
20 }
21
~Merge()22 Merge::~Merge() {
23 for (const auto& rec : fRecs) {
24 this->unobserveInval(rec.fGeo);
25 }
26 }
27
onClip(SkCanvas * canvas,bool antiAlias) const28 void Merge::onClip(SkCanvas* canvas, bool antiAlias) const {
29 canvas->clipPath(fMerged, SkClipOp::kIntersect, antiAlias);
30 }
31
onDraw(SkCanvas * canvas,const SkPaint & paint) const32 void Merge::onDraw(SkCanvas* canvas, const SkPaint& paint) const {
33 canvas->drawPath(fMerged, paint);
34 }
35
onAsPath() const36 SkPath Merge::onAsPath() const {
37 return fMerged;
38 }
39
mode_to_op(Merge::Mode mode)40 static SkPathOp mode_to_op(Merge::Mode mode) {
41 switch (mode) {
42 case Merge::Mode::kUnion:
43 return kUnion_SkPathOp;
44 case Merge::Mode::kIntersect:
45 return kIntersect_SkPathOp;
46 case Merge::Mode::kDifference:
47 return kDifference_SkPathOp;
48 case Merge::Mode::kReverseDifference:
49 return kReverseDifference_SkPathOp;
50 case Merge::Mode::kXOR:
51 return kXOR_SkPathOp;
52 default:
53 break;
54 }
55
56 return kUnion_SkPathOp;
57 }
58
onRevalidate(InvalidationController * ic,const SkMatrix & ctm)59 SkRect Merge::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
60 SkASSERT(this->hasInval());
61
62 SkOpBuilder builder;
63
64 fMerged.reset();
65 bool in_builder = false;
66
67 for (const auto& rec : fRecs) {
68 rec.fGeo->revalidate(ic, ctm);
69
70 // Merge is not currently supported by SkOpBuidler.
71 if (rec.fMode == Mode::kMerge) {
72 if (in_builder) {
73 builder.resolve(&fMerged);
74 in_builder = false;
75 }
76
77 fMerged.addPath(rec.fGeo->asPath());
78 continue;
79 }
80
81 if (!in_builder) {
82 builder.add(fMerged, kUnion_SkPathOp);
83 in_builder = true;
84 }
85
86 builder.add(rec.fGeo->asPath(), mode_to_op(rec.fMode));
87 }
88
89 if (in_builder) {
90 builder.resolve(&fMerged);
91 }
92
93 fMerged.shrinkToFit();
94
95 return fMerged.computeTightBounds();
96 }
97
98 } // namespace sksg
99