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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. |
| 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; |
| 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; |
| 56 uint32_t fClassID; |
| 57 |
| 58 friend class GrDrawSnap; // for class ID stuff |
| 59 }; |
| 60 |
| 61 class GrDrawSnap : public GrNonAtomicRef { |
| 62 public: |
| 63 GrDrawSnap() : fClassID(GrDraw::kIllegalDrawClassID) {} |
| 64 uint32_t classID() const { |
| 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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