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/*
(c) Copyright 2001-2009 The world wide DirectFB Open Source Community (directfb.org)
(c) Copyright 2000-2004 Convergence (integrated media) GmbH
All rights reserved.
Written by Denis Oliver Kropp <dok@directfb.org>,
Andreas Hundt <andi@fischlustig.de>,
Sven Neumann <neo@directfb.org>,
Ville Syrjälä <syrjala@sci.fi> and
Claudio Ciccani <klan@users.sf.net>.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef __SURFACEMANAGER_H__
#define __SURFACEMANAGER_H__
#include <directfb.h>
#include <core/coretypes.h>
typedef struct _SurfaceManager SurfaceManager;
typedef struct _Chunk Chunk;
/*
* initially there is one big free chunk,
* chunks are splitted into a free and an occupied chunk if memory is allocated,
* two chunks are merged to one free chunk if memory is deallocated
*/
struct _Chunk {
int magic;
int offset; /* offset in memory,
is greater or equal to the heap offset */
int length; /* length of this chunk in bytes */
int pitch;
CoreSurfaceBuffer *buffer; /* pointer to surface buffer occupying
this chunk, or NULL if chunk is free */
CoreSurfaceAllocation *allocation;
int tolerations; /* number of times this chunk was scanned
occupied, resetted in assure_video */
Chunk *prev;
Chunk *next;
};
struct _SurfaceManager {
int magic;
FusionSHMPoolShared *shmpool;
Chunk *chunks;
int offset;
int length; /* length of the heap in bytes */
int avail; /* amount of available memory in bytes */
int min_toleration;
bool suspended;
};
DFBResult dfb_surfacemanager_create ( CoreDFB *core,
unsigned int length,
SurfaceManager **ret_manager );
void dfb_surfacemanager_destroy( SurfaceManager *manager );
/*
* finds and allocates one for the surface or fails,
* after success the video health is CSH_RESTORE.
* NOTE: this does not notify the listeners
*/
DFBResult dfb_surfacemanager_allocate( CoreDFB *core,
SurfaceManager *manager,
CoreSurfaceBuffer *buffer,
CoreSurfaceAllocation *allocation,
Chunk **ret_chunk );
DFBResult dfb_surfacemanager_displace( CoreDFB *core,
SurfaceManager *manager,
CoreSurfaceBuffer *buffer );
/*
* sets the video health to CSH_INVALID frees the chunk and
* notifies the listeners
*/
DFBResult dfb_surfacemanager_deallocate( SurfaceManager *manager,
Chunk *chunk );
#endif
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