1 /*
2 * Copyright 2012 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 "GrPath.h"
9 #include "GrShape.h"
10
write_style_key(uint32_t * key,const GrStyle & style)11 static inline void write_style_key(uint32_t* key, const GrStyle& style) {
12 // Pass 1 for the scale since the GPU will apply the style not GrStyle::applyToPath().
13 GrStyle::WriteKey(key, style, GrStyle::Apply::kPathEffectAndStrokeRec, SK_Scalar1);
14 }
15
16
ComputeKey(const GrShape & shape,GrUniqueKey * key,bool * outIsVolatile)17 void GrPath::ComputeKey(const GrShape& shape, GrUniqueKey* key, bool* outIsVolatile) {
18 int geoCnt = shape.unstyledKeySize();
19 int styleCnt = GrStyle::KeySize(shape.style(), GrStyle::Apply::kPathEffectAndStrokeRec);
20 // This should only fail for an arbitrary path effect, and we should not have gotten
21 // here with anything other than a dash path effect.
22 SkASSERT(styleCnt >= 0);
23 if (geoCnt < 0) {
24 *outIsVolatile = true;
25 return;
26 }
27 static const GrUniqueKey::Domain kGeneralPathDomain = GrUniqueKey::GenerateDomain();
28 GrUniqueKey::Builder builder(key, kGeneralPathDomain, geoCnt + styleCnt, "Path");
29 shape.writeUnstyledKey(&builder[0]);
30 if (styleCnt) {
31 write_style_key(&builder[geoCnt], shape.style());
32 }
33 *outIsVolatile = false;
34 }
35
36 #ifdef SK_DEBUG
isEqualTo(const SkPath & path,const GrStyle & style) const37 bool GrPath::isEqualTo(const SkPath& path, const GrStyle& style) const {
38 // Since this is only called in debug we don't care about performance.
39 int cnt0 = GrStyle::KeySize(fStyle, GrStyle::Apply::kPathEffectAndStrokeRec);
40 int cnt1 = GrStyle::KeySize(style, GrStyle::Apply::kPathEffectAndStrokeRec);
41 if (cnt0 < 0 || cnt1 < 0 || cnt0 != cnt1) {
42 return false;
43 }
44 if (cnt0) {
45 SkAutoTArray<uint32_t> key0(cnt0);
46 SkAutoTArray<uint32_t> key1(cnt0);
47 write_style_key(key0.get(), fStyle);
48 write_style_key(key1.get(), style);
49 if (0 != memcmp(key0.get(), key1.get(), cnt0)) {
50 return false;
51 }
52 }
53 return fSkPath == path;
54 }
55 #endif
56