Quake-III-Arena

Quake III Arena GPL Source Release
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jcomapi.cpp (2737B)

      1 /*
      2  * jcomapi.c
      3  *
      4  * Copyright (C) 1994, 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.
      7  *
      8  * This file contains application interface routines that are used for both
      9  * compression and decompression.
     10  */
     11 
     12 #define JPEG_INTERNALS
     13 #include "jinclude.h"
     14 #include "jpeglib.h"
     15 
     16 
     17 /*
     18  * Abort processing of a JPEG compression or decompression operation,
     19  * but don't destroy the object itself.
     20  *
     21  * For this, we merely clean up all the nonpermanent memory pools.
     22  * Note that temp files (virtual arrays) are not allowed to belong to
     23  * the permanent pool, so we will be able to close all temp files here.
     24  * Closing a data source or destination, if necessary, is the application's
     25  * responsibility.
     26  */
     27 
     28 GLOBAL void
     29 jpeg_abort (j_common_ptr cinfo)
     30 {
     31   int pool;
     32 
     33   /* Releasing pools in reverse order might help avoid fragmentation
     34    * with some (brain-damaged) malloc libraries.
     35    */
     36   for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
     37     (*cinfo->mem->free_pool) (cinfo, pool);
     38   }
     39 
     40   /* Reset overall state for possible reuse of object */
     41   cinfo->global_state = (cinfo->is_decompressor ? DSTATE_START : CSTATE_START);
     42 }
     43 
     44 
     45 /*
     46  * Destruction of a JPEG object.
     47  *
     48  * Everything gets deallocated except the master jpeg_compress_struct itself
     49  * and the error manager struct.  Both of these are supplied by the application
     50  * and must be freed, if necessary, by the application.  (Often they are on
     51  * the stack and so don't need to be freed anyway.)
     52  * Closing a data source or destination, if necessary, is the application's
     53  * responsibility.
     54  */
     55 
     56 GLOBAL void
     57 jpeg_destroy (j_common_ptr cinfo)
     58 {
     59   /* We need only tell the memory manager to release everything. */
     60   /* NB: mem pointer is NULL if memory mgr failed to initialize. */
     61   if (cinfo->mem != NULL)
     62     (*cinfo->mem->self_destruct) (cinfo);
     63   cinfo->mem = NULL;		/* be safe if jpeg_destroy is called twice */
     64   cinfo->global_state = 0;	/* mark it destroyed */
     65 }
     66 
     67 
     68 /*
     69  * Convenience routines for allocating quantization and Huffman tables.
     70  * (Would jutils.c be a more reasonable place to put these?)
     71  */
     72 
     73 GLOBAL JQUANT_TBL *
     74 jpeg_alloc_quant_table (j_common_ptr cinfo)
     75 {
     76   JQUANT_TBL *tbl;
     77 
     78   tbl = (JQUANT_TBL *)
     79     (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
     80   tbl->sent_table = FALSE;	/* make sure this is false in any new table */
     81   return tbl;
     82 }
     83 
     84 
     85 GLOBAL JHUFF_TBL *
     86 jpeg_alloc_huff_table (j_common_ptr cinfo)
     87 {
     88   JHUFF_TBL *tbl;
     89 
     90   tbl = (JHUFF_TBL *)
     91     (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
     92   tbl->sent_table = FALSE;	/* make sure this is false in any new table */
     93   return tbl;
     94 }