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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 #ifndef GrDraw_DEFINED | |
9 #define GrDraw_DEFINED | |
10 | |
11 #include "GrNonAtomicRef.h" | |
12 | |
13 #include "GrRenderTarget.h" | |
14 | |
15 class GrDrawTarget; | |
16 | |
17 #define GRDRAW_ASSERT_OWNED_RESOURCE(R) SkASSERT(!(R) || (R)->getContext() == fC ontext) | |
18 | |
19 /* | |
20 * GrDraw is a virtual class which captures the scope of the entry point on SkGp uDevice where it | |
21 * originates. After creation, it lives on the GrPipeline where it used as a po tential fast path | |
22 * for batching. | |
bsalomon
2015/09/23 13:49:38
"fast path" needs some explanation. something abou
joshualitt
2015/09/25 18:17:12
Acknowledged.
| |
23 * | |
24 * A GrDraw must be able to fully draw itself if fastpath batching is not possib le | |
25 */ | |
26 | |
27 class GrDraw { | |
28 public: | |
29 GrDraw() : fClassID(kIllegalDrawClassID) {} | |
30 virtual ~GrDraw() {} | |
31 | |
32 virtual void execute(GrDrawTarget*) const=0; | |
robertphillips
2015/09/25 12:48:49
Some comments about how these class IDs work and w
joshualitt
2015/09/25 18:17:12
Acknowledged.
| |
33 uint32_t classID() const { SkASSERT(!fClassID == kIllegalDrawClassID); retur n fClassID; } | |
34 template <typename PROC_SUBCLASS> static uint32_t ClassID() { | |
35 static uint32_t kClassID = GenID(&gCurrDrawClassID); | |
36 return kClassID; | |
37 } | |
38 | |
39 protected: | |
40 static uint32_t GenID(int32_t* idCounter) { | |
41 // The atomic inc returns the old value not the incremented value. So we add | |
42 // 1 to the returned value. | |
43 uint32_t id = static_cast<uint32_t>(sk_atomic_inc(idCounter)) + 1; | |
44 if (!id) { | |
45 SkFAIL("This should never wrap as it should only be called once for each GrDraw " | |
46 "subclass."); | |
47 } | |
48 return id; | |
49 } | |
50 | |
51 enum { | |
52 kIllegalDrawClassID = 0 | |
53 }; | |
54 | |
55 static int32_t gCurrDrawClassID; | |
robertphillips
2015/09/25 12:48:49
Do we need/even use 'fClassID'. Don't we just call
joshualitt
2015/09/25 18:17:12
Acknowledged.
| |
56 uint32_t fClassID; | |
57 | |
58 friend class GrDrawSnap; // for class ID stuff | |
59 }; | |
60 | |
robertphillips
2015/09/25 12:48:48
I second the motion for a comment
joshualitt
2015/09/25 18:17:12
Acknowledged.
| |
61 class GrDrawSnap : public GrNonAtomicRef { | |
bsalomon
2015/09/23 13:49:38
/** ... */
joshualitt
2015/09/25 18:17:12
Acknowledged.
| |
62 public: | |
63 GrDrawSnap() : fClassID(GrDraw::kIllegalDrawClassID) {} | |
64 uint32_t classID() const { | |
robertphillips
2015/09/25 12:48:49
use != ?
| |
65 SkASSERT(!fClassID == GrDraw::kIllegalDrawClassID); | |
66 return fClassID; | |
67 } | |
68 | |
69 protected: | |
70 uint32_t fClassID; | |
71 typedef GrNonAtomicRef INHERITED; | |
72 }; | |
73 | |
74 #endif | |
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