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/*
* jcomapi.c
*
* Copyright (C) 1994-1997, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* ---------------------------------------------------------------------
* x86 SIMD extension for IJG JPEG library
* Copyright (C) 1999-2006, MIYASAKA Masaru.
* This file has been modified for SIMD extension.
* Last Modified : March 11, 2005
* ---------------------------------------------------------------------
*
* This file contains application interface routines that are used for both
* compression and decompression.
*/
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
/*
* Abort processing of a JPEG compression or decompression operation,
* but don't destroy the object itself.
*
* For this, we merely clean up all the nonpermanent memory pools.
* Note that temp files (virtual arrays) are not allowed to belong to
* the permanent pool, so we will be able to close all temp files here.
* Closing a data source or destination, if necessary, is the application's
* responsibility.
*/
GLOBAL(void)
jpeg_abort (j_common_ptr cinfo)
{
int pool;
/* Do nothing if called on a not-initialized or destroyed JPEG object. */
if (cinfo->mem == NULL)
return;
/* Releasing pools in reverse order might help avoid fragmentation
* with some (brain-damaged) malloc libraries.
*/
for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
(*cinfo->mem->free_pool) (cinfo, pool);
}
/* Reset overall state for possible reuse of object */
if (cinfo->is_decompressor) {
cinfo->global_state = DSTATE_START;
/* Try to keep application from accessing now-deleted marker list.
* A bit kludgy to do it here, but this is the most central place.
*/
((j_decompress_ptr) cinfo)->marker_list = NULL;
} else {
cinfo->global_state = CSTATE_START;
}
}
/*
* Destruction of a JPEG object.
*
* Everything gets deallocated except the master jpeg_compress_struct itself
* and the error manager struct. Both of these are supplied by the application
* and must be freed, if necessary, by the application. (Often they are on
* the stack and so don't need to be freed anyway.)
* Closing a data source or destination, if necessary, is the application's
* responsibility.
*/
GLOBAL(void)
jpeg_destroy (j_common_ptr cinfo)
{
/* We need only tell the memory manager to release everything. */
/* NB: mem pointer is NULL if memory mgr failed to initialize. */
if (cinfo->mem != NULL)
(*cinfo->mem->self_destruct) (cinfo);
cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */
cinfo->global_state = 0; /* mark it destroyed */
}
/*
* Convenience routines for allocating quantization and Huffman tables.
* (Would jutils.c be a more reasonable place to put these?)
*/
GLOBAL(JQUANT_TBL *)
jpeg_alloc_quant_table (j_common_ptr cinfo)
{
JQUANT_TBL *tbl;
tbl = (JQUANT_TBL *)
(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
tbl->sent_table = FALSE; /* make sure this is false in any new table */
return tbl;
}
GLOBAL(JHUFF_TBL *)
jpeg_alloc_huff_table (j_common_ptr cinfo)
{
JHUFF_TBL *tbl;
tbl = (JHUFF_TBL *)
(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
tbl->sent_table = FALSE; /* make sure this is false in any new table */
return tbl;
}
/*
* SIMD Ext: Checking for support of SIMD instruction set.
*/
GLOBAL(unsigned int)
jpeg_simd_support (j_common_ptr cinfo)
{
enum { JSIMD_INVALID = ~0 };
static volatile unsigned int simd_supported = JSIMD_INVALID;
if (simd_supported == JSIMD_INVALID)
simd_supported = jpeg_simd_os_support(jpeg_simd_cpu_support());
#ifndef JSIMD_MASKFUNC_NOT_SUPPORTED
if (cinfo != NULL) /* Turn off the masked flags */
return simd_supported & ~jpeg_simd_mask(cinfo, JSIMD_NONE, JSIMD_NONE);
#endif
return simd_supported;
}
#ifndef JSIMD_MASKFUNC_NOT_SUPPORTED
/*
* SIMD Ext: modify/retrieve SIMD instruction mask
*/
GLOBAL(unsigned int)
jpeg_simd_mask (j_common_ptr cinfo, unsigned int remove, unsigned int add)
{
unsigned long *gp;
unsigned int oldmask;
if (cinfo->is_decompressor)
gp = (unsigned long *) &((j_decompress_ptr) cinfo)->output_gamma;
else /* compressor */
gp = (unsigned long *) &((j_compress_ptr) cinfo)->input_gamma;
if ((gp[1] == 0x3FF00000 || gp[1] == 0x00000000) && /* +1.0 or +0.0 */
(gp[0] & ~JSIMD_ALL) == 0) {
oldmask = gp[0];
if (((remove | add) & ~JSIMD_ALL) == 0)
gp[0] = (oldmask & ~remove) | add;
} else {
oldmask = 0; /* error */
}
return oldmask;
}
#endif /* !JSIMD_MASKFUNC_NOT_SUPPORTED */