d6297f7d09
added buffers should now be labeled properly. Change-Id: I28aa753fbe89ab89134e7753575319478934c7fa
388 lines
11 KiB
C++
388 lines
11 KiB
C++
/*
|
|
* Copyright (C) 2007 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef ANDROID_SF_SHARED_BUFFER_STACK_H
|
|
#define ANDROID_SF_SHARED_BUFFER_STACK_H
|
|
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <cutils/compiler.h>
|
|
|
|
#include <utils/Debug.h>
|
|
#include <utils/threads.h>
|
|
#include <utils/String8.h>
|
|
|
|
#include <ui/Rect.h>
|
|
|
|
namespace android {
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/*
|
|
* These classes manage a stack of buffers in shared memory.
|
|
*
|
|
* SharedClient: represents a client with several stacks
|
|
* SharedBufferStack: represents a stack of buffers
|
|
* SharedBufferClient: manipulates the SharedBufferStack from the client side
|
|
* SharedBufferServer: manipulates the SharedBufferStack from the server side
|
|
*
|
|
* Buffers can be dequeued until there are none available, they can be locked
|
|
* unless they are in use by the server, which is only the case for the last
|
|
* dequeue-able buffer. When these various conditions are not met, the caller
|
|
* waits until the condition is met.
|
|
*
|
|
*
|
|
* CAVEATS:
|
|
*
|
|
* In the current implementation there are several limitations:
|
|
* - buffers must be locked in the same order they've been dequeued
|
|
* - buffers must be enqueued in the same order they've been locked
|
|
* - dequeue() is not reentrant
|
|
* - no error checks are done on the condition above
|
|
*
|
|
*/
|
|
|
|
// When changing these values, the COMPILE_TIME_ASSERT at the end of this
|
|
// file need to be updated.
|
|
const unsigned int NUM_LAYERS_MAX = 31;
|
|
const unsigned int NUM_BUFFER_MAX = 16;
|
|
const unsigned int NUM_DISPLAY_MAX = 4;
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
class Region;
|
|
class SharedBufferStack;
|
|
class SharedClient;
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// 4 * (11 + 7 + (1 + 2*NUM_RECT_MAX) * NUM_BUFFER_MAX) * NUM_LAYERS_MAX
|
|
// 4 * (11 + 7 + (1 + 2*7)*16) * 31
|
|
// 1032 * 31
|
|
// = ~27 KiB (31992)
|
|
|
|
class SharedBufferStack
|
|
{
|
|
friend class SharedClient;
|
|
friend class SharedBufferBase;
|
|
friend class SharedBufferClient;
|
|
friend class SharedBufferServer;
|
|
|
|
public:
|
|
struct Statistics { // 4 longs
|
|
typedef int32_t usecs_t;
|
|
usecs_t totalTime;
|
|
usecs_t reserved[3];
|
|
};
|
|
|
|
struct SmallRect {
|
|
uint16_t l, t, r, b;
|
|
};
|
|
|
|
struct FlatRegion { // 52 bytes = 4 * (1 + 2*N)
|
|
static const unsigned int NUM_RECT_MAX = 6;
|
|
uint32_t count;
|
|
SmallRect rects[NUM_RECT_MAX];
|
|
};
|
|
|
|
struct BufferData {
|
|
FlatRegion dirtyRegion;
|
|
SmallRect crop;
|
|
};
|
|
|
|
SharedBufferStack();
|
|
void init(int32_t identity);
|
|
status_t setDirtyRegion(int buffer, const Region& reg);
|
|
status_t setCrop(int buffer, const Rect& reg);
|
|
Region getDirtyRegion(int buffer) const;
|
|
|
|
// these attributes are part of the conditions/updates
|
|
volatile int32_t head; // server's current front buffer
|
|
volatile int32_t available; // number of dequeue-able buffers
|
|
volatile int32_t queued; // number of buffers waiting for post
|
|
volatile int32_t inUse; // buffer currently in use by SF
|
|
volatile status_t status; // surface's status code
|
|
|
|
// not part of the conditions
|
|
volatile int32_t reallocMask;
|
|
volatile int8_t index[NUM_BUFFER_MAX];
|
|
|
|
int32_t identity; // surface's identity (const)
|
|
int32_t reserved32[2];
|
|
Statistics stats;
|
|
int32_t reserved;
|
|
BufferData buffers[NUM_BUFFER_MAX]; // 960 bytes
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// 32 KB max
|
|
class SharedClient
|
|
{
|
|
public:
|
|
SharedClient();
|
|
~SharedClient();
|
|
|
|
status_t validate(size_t token) const;
|
|
uint32_t getIdentity(size_t token) const;
|
|
|
|
private:
|
|
friend class SharedBufferBase;
|
|
friend class SharedBufferClient;
|
|
friend class SharedBufferServer;
|
|
|
|
// FIXME: this should be replaced by a lock-less primitive
|
|
Mutex lock;
|
|
Condition cv;
|
|
SharedBufferStack surfaces[ NUM_LAYERS_MAX ];
|
|
};
|
|
|
|
// ============================================================================
|
|
|
|
class SharedBufferBase
|
|
{
|
|
public:
|
|
SharedBufferBase(SharedClient* sharedClient, int surface, int num,
|
|
int32_t identity);
|
|
~SharedBufferBase();
|
|
uint32_t getIdentity();
|
|
status_t getStatus() const;
|
|
size_t getFrontBuffer() const;
|
|
String8 dump(char const* prefix) const;
|
|
|
|
protected:
|
|
SharedClient* const mSharedClient;
|
|
SharedBufferStack* const mSharedStack;
|
|
int mNumBuffers;
|
|
const int mIdentity;
|
|
int32_t computeTail() const;
|
|
|
|
friend struct Update;
|
|
friend struct QueueUpdate;
|
|
|
|
struct ConditionBase {
|
|
SharedBufferStack& stack;
|
|
inline ConditionBase(SharedBufferBase* sbc)
|
|
: stack(*sbc->mSharedStack) { }
|
|
virtual ~ConditionBase() { };
|
|
virtual bool operator()() const = 0;
|
|
virtual const char* name() const = 0;
|
|
};
|
|
status_t waitForCondition(const ConditionBase& condition);
|
|
|
|
struct UpdateBase {
|
|
SharedBufferStack& stack;
|
|
inline UpdateBase(SharedBufferBase* sbb)
|
|
: stack(*sbb->mSharedStack) { }
|
|
};
|
|
template <typename T>
|
|
status_t updateCondition(T update);
|
|
};
|
|
|
|
template <typename T>
|
|
status_t SharedBufferBase::updateCondition(T update) {
|
|
SharedClient& client( *mSharedClient );
|
|
Mutex::Autolock _l(client.lock);
|
|
ssize_t result = update();
|
|
client.cv.broadcast();
|
|
return result;
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
class SharedBufferClient : public SharedBufferBase
|
|
{
|
|
public:
|
|
SharedBufferClient(SharedClient* sharedClient, int surface, int num,
|
|
int32_t identity);
|
|
|
|
ssize_t dequeue();
|
|
status_t undoDequeue(int buf);
|
|
|
|
status_t lock(int buf);
|
|
status_t queue(int buf);
|
|
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;
|
|
friend struct DequeueCondition;
|
|
friend struct LockCondition;
|
|
|
|
struct QueueUpdate : public UpdateBase {
|
|
inline QueueUpdate(SharedBufferBase* sbb);
|
|
inline ssize_t operator()();
|
|
};
|
|
|
|
struct UndoDequeueUpdate : public UpdateBase {
|
|
inline UndoDequeueUpdate(SharedBufferBase* sbb);
|
|
inline ssize_t operator()();
|
|
};
|
|
|
|
// --
|
|
|
|
struct DequeueCondition : public ConditionBase {
|
|
inline DequeueCondition(SharedBufferClient* sbc);
|
|
inline bool operator()() const;
|
|
inline const char* name() const { return "DequeueCondition"; }
|
|
};
|
|
|
|
struct LockCondition : public ConditionBase {
|
|
int buf;
|
|
inline LockCondition(SharedBufferClient* sbc, int buf);
|
|
inline bool operator()() const;
|
|
inline const char* name() const { return "LockCondition"; }
|
|
};
|
|
|
|
int32_t tail;
|
|
int32_t undoDequeueTail;
|
|
int32_t queued_head;
|
|
// statistics...
|
|
nsecs_t mDequeueTime[NUM_BUFFER_MAX];
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
class SharedBufferServer : public SharedBufferBase
|
|
{
|
|
public:
|
|
SharedBufferServer(SharedClient* sharedClient, int surface, int num,
|
|
int32_t identity);
|
|
|
|
ssize_t retireAndLock();
|
|
status_t unlock(int buffer);
|
|
void setStatus(status_t status);
|
|
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(__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 ++() {
|
|
mask &= ~(1<<(31-curr));
|
|
curr = __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);
|
|
inline ssize_t operator()();
|
|
};
|
|
|
|
struct RetireUpdate : public UpdateBase {
|
|
const int numBuffers;
|
|
inline RetireUpdate(SharedBufferBase* sbb, int numBuffers);
|
|
inline ssize_t operator()();
|
|
};
|
|
|
|
struct StatusUpdate : public UpdateBase {
|
|
const status_t status;
|
|
inline StatusUpdate(SharedBufferBase* sbb, status_t status);
|
|
inline ssize_t operator()();
|
|
};
|
|
|
|
struct ReallocateCondition : public ConditionBase {
|
|
int buf;
|
|
inline ReallocateCondition(SharedBufferBase* sbb, int buf);
|
|
inline bool operator()() const;
|
|
inline const char* name() const { return "ReallocateCondition"; }
|
|
};
|
|
};
|
|
|
|
// ===========================================================================
|
|
|
|
struct display_cblk_t
|
|
{
|
|
uint16_t w;
|
|
uint16_t h;
|
|
uint8_t format;
|
|
uint8_t orientation;
|
|
uint8_t reserved[2];
|
|
float fps;
|
|
float density;
|
|
float xdpi;
|
|
float ydpi;
|
|
uint32_t pad[2];
|
|
};
|
|
|
|
struct surface_flinger_cblk_t // 4KB max
|
|
{
|
|
uint8_t connected;
|
|
uint8_t reserved[3];
|
|
uint32_t pad[7];
|
|
display_cblk_t displays[NUM_DISPLAY_MAX];
|
|
};
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
COMPILE_TIME_ASSERT(sizeof(SharedClient) <= 32768)
|
|
COMPILE_TIME_ASSERT(sizeof(surface_flinger_cblk_t) <= 4096)
|
|
|
|
// ---------------------------------------------------------------------------
|
|
}; // namespace android
|
|
|
|
#endif /* ANDROID_SF_SHARED_BUFFER_STACK_H */
|