4 * Copyright (C) 1992-1996, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
8 * Copyright (C) 2009-2011, The AROS development team.
10 * This file provides a simple implementation of the system-dependent portion
11 * of the JPEG memory manager using the Amiga API. This implementation
12 * assumes that no backing-store files are needed: all required space
13 * can be obtained from the system.
14 * You'll need to have lots of main memory (or virtual memory) if you want
15 * to process big images.
16 * Note that the max_memory_to_use option is ignored by this implementation.
19 #include <proto/exec.h>
20 #include <exec/memory.h>
21 #include <exec/types.h>
29 #define JPEG_INTERNALS
32 #include "jmemsys.h" /* import the system-dependent declarations */
35 * Memory allocation and freeing are controlled by the regular library
36 * routines malloc() and free().
40 jpeg_get_small (j_common_ptr cinfo
, size_t sizeofobject
)
42 return (void *) AllocPooled(_mempool
, sizeofobject
);
46 jpeg_free_small (j_common_ptr cinfo
, void * object
, size_t sizeofobject
)
48 FreePooled(_mempool
, object
, sizeofobject
);
53 * "Large" objects are treated the same as "small" ones.
54 * NB: although we include FAR keywords in the routine declarations,
55 * this file won't actually work in 80x86 small/medium model; at least,
56 * you probably won't be able to process useful-size images in only 64KB.
60 jpeg_get_large (j_common_ptr cinfo
, size_t sizeofobject
)
62 return (void FAR
*) AllocPooled(_mempool
, sizeofobject
);
66 jpeg_free_large (j_common_ptr cinfo
, void FAR
* object
, size_t sizeofobject
)
68 FreePooled(_mempool
, object
, sizeofobject
);
73 * This routine computes the total memory space available for allocation.
74 * Here we always say, "we got all you want bud!"
78 jpeg_mem_available (j_common_ptr cinfo
, long min_bytes_needed
,
79 long max_bytes_needed
, long already_allocated
)
81 long avail
= (long)AvailMem(MEMF_LARGEST
);
83 return max_bytes_needed
> avail
? avail
: max_bytes_needed
;
88 * Backing store (temporary file) management.
89 * Since jpeg_mem_available always promised the moon,
90 * this should never be called and we can just error out.
94 jpeg_open_backing_store (j_common_ptr cinfo
, backing_store_ptr info
,
95 long total_bytes_needed
)
97 ERREXIT(cinfo
, JERR_NO_BACKING_STORE
);
102 * These routines take care of any system-dependent initialization and
107 jpeg_mem_init (j_common_ptr cinfo
)
109 _mempool
= CreatePool(MEMF_ANY
| MEMF_SEM_PROTECTED
, 65536L, 4096L);
111 return AvailMem(MEMF_LARGEST
);
115 jpeg_mem_term (j_common_ptr cinfo
)
117 DeletePool(_mempool
);