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/*
* Copyright (c) 2013 The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef OVERLAY_WRITEBACK_H
#define OVERLAY_WRITEBACK_H
#include "overlayMem.h"
namespace overlay {
class WritebackMgr;
class WritebackMem {
public:
explicit WritebackMem() : mCurrOffsetIndex(0) {
memset(&mOffsets, 0, sizeof(mOffsets));
}
~WritebackMem() { dealloc(); }
bool manageMem(uint32_t size, bool isSecure);
void useNextBuffer() {
mCurrOffsetIndex = (mCurrOffsetIndex + 1) % NUM_BUFS;
}
uint32_t getOffset() const { return mOffsets[mCurrOffsetIndex]; }
int getDstFd() const { return mBuf.getFD(); }
private:
bool alloc(uint32_t size, bool isSecure);
bool dealloc();
enum { NUM_BUFS = 2 };
OvMem mBuf;
uint32_t mOffsets[NUM_BUFS];
uint32_t mCurrOffsetIndex;
};
//Abstracts the WB2 interface of MDP
//Has modes to either manage memory or work with memory allocated elsewhere
class Writeback {
public:
~Writeback();
bool configureDpyInfo(int xres, int yres);
bool configureMemory(uint32_t size);
/* Blocking write. (queue, commit, dequeue)
* This class will do writeback memory management.
* This class will call display-commit on writeback mixer.
*/
bool writeSync();
/* Blocking write. (queue, commit, dequeue)
* Client must do writeback memory management.
* Client must not call display-commit on writeback mixer.
*/
bool writeSync(int opFd, uint32_t opOffset);
/* Async queue. (Does not write)
* Client must do writeback memory management.
* Client must call display-commit on their own.
* Client must use sync mechanism e.g sync pt.
*/
bool queueBuffer(int opFd, uint32_t opOffset);
uint32_t getOffset() const { return mWbMem.getOffset(); }
int getDstFd() const { return mWbMem.getDstFd(); }
int getWidth() const { return mXres; }
int getHeight() const { return mYres; }
/* Subject to GC if writeback isnt used for a drawing round.
* Get always if caching the value.
*/
int getFbFd() const { return mFd.getFD(); }
int getOutputFormat();
bool setOutputFormat(int mdpFormat);
bool setSecure(bool isSecure);
static Writeback* getInstance();
static void configBegin() { sUsed = false; }
static void configDone();
static void clear();
//Will take a dump of data structure only if there is an instance existing
//Returns true if dump is added to the input buffer, false otherwise
static bool getDump(char *buf, size_t len);
private:
explicit Writeback();
bool startSession();
bool stopSession();
//Actually block_until_write_done for the usage here.
bool dequeueBuffer();
OvFD mFd;
WritebackMem mWbMem;
struct msmfb_data mFbData;
int mXres;
int mYres;
int mOpFmt;
bool mSecure;
static bool sUsed;
static Writeback *sWb;
};
}
#endif