diff options
| -rw-r--r-- | include/private/surfaceflinger/SharedBufferStack.h | 55 |
1 files changed, 52 insertions, 3 deletions
diff --git a/include/private/surfaceflinger/SharedBufferStack.h b/include/private/surfaceflinger/SharedBufferStack.h index 2504d39..c23832d 100644 --- a/include/private/surfaceflinger/SharedBufferStack.h +++ b/include/private/surfaceflinger/SharedBufferStack.h @@ -129,7 +129,7 @@ public: // ---------------------------------------------------------------------------- -// 4 KB max +// 32 KB max class SharedClient { public: @@ -166,7 +166,7 @@ public: protected: SharedClient* const mSharedClient; SharedBufferStack* const mSharedStack; - const int mNumBuffers; + int mNumBuffers; const int mIdentity; int32_t computeTail() const; @@ -217,6 +217,7 @@ public: bool needNewBuffer(int buffer) const; status_t setDirtyRegion(int buffer, const Region& reg); status_t setCrop(int buffer, const Rect& reg); + status_t setBufferCount(int bufferCount); private: friend struct Condition; @@ -269,13 +270,61 @@ public: status_t reallocate(); status_t assertReallocate(int buffer); int32_t getQueuedCount() const; - Region getDirtyRegion(int buffer) const; + status_t resize(int newNumBuffers); + SharedBufferStack::Statistics getStats() const; private: + /* + * BufferList is basically a fixed-capacity sorted-vector of + * unsigned 5-bits ints using a 32-bits int as storage. + * it has efficient iterators to find items in the list and not in the list. + */ + class BufferList { + size_t mCapacity; + uint32_t mList; + public: + BufferList(size_t c = NUM_BUFFER_MAX) : mCapacity(c), mList(0) { } + status_t add(int value); + status_t remove(int value); + + class const_iterator { + friend class BufferList; + uint32_t mask, curr; + const_iterator(uint32_t mask) : + mask(mask), curr(31 - __builtin_clz(mask)) { } + public: + inline bool operator == (const const_iterator& rhs) const { + return mask == rhs.mask; + } + inline bool operator != (const const_iterator& rhs) const { + return mask != rhs.mask; + } + inline int operator *() const { return curr; } + inline const const_iterator& operator ++(int) { + mask &= ~curr; + curr = 31 - __builtin_clz(mask); + return *this; + } + }; + + inline const_iterator begin() const { + return const_iterator(mList); + } + inline const_iterator end() const { + return const_iterator(0); + } + inline const_iterator free_begin() const { + uint32_t mask = (1 << (32-mCapacity)) - 1; + return const_iterator( ~(mList | mask) ); + } + }; + + BufferList mBufferList; + struct UnlockUpdate : public UpdateBase { const int lockedBuffer; inline UnlockUpdate(SharedBufferBase* sbb, int lockedBuffer); |