87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
// * jcomapi.c
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// *
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// * Copyright (C) 1994, Thomas G. Lane.
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// * This file is part of the Independent JPEG Group's software.
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// * For conditions of distribution and use, see the accompanying README file.
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// *
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// * This file contains application interface routines that are used for both
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// * compression and decompression.
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#define JPEG_INTERNALS
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#include "JINCLUDE.h"
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#include "JPEGLIB.h"
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// * Abort processing of a JPEG compression or decompression operation,
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// * but don't destroy the object itself.
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// *
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// * For this, we merely clean up all the nonpermanent memory pools.
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// * Note that temp files (virtual arrays) are not allowed to belong to
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// * the permanent pool, so we will be able to close all temp files here.
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// * Closing a data source or destination, if necessary, is the application's
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// * responsibility.
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GLOBAL void
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jpeg_abort (j_common_ptr cinfo)
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{
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int pool;
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// Releasing pools in reverse order might help avoid fragmentation
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// * with some (brain-damaged) malloc libraries.
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for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
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(*cinfo->mem->free_pool) (cinfo, pool);
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}
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// Reset overall state for possible reuse of object
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cinfo->global_state = (cinfo->is_decompressor ? DSTATE_START : CSTATE_START);
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}
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// * Destruction of a JPEG object.
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// *
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// * Everything gets deallocated except the master jpeg_compress_struct itself
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// * and the error manager struct. Both of these are supplied by the application
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// * and must be freed, if necessary, by the application. (Often they are on
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// * the stack and so don't need to be freed anyway.)
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// * Closing a data source or destination, if necessary, is the application's
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// * responsibility.
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GLOBAL void
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jpeg_destroy (j_common_ptr cinfo)
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{
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// We need only tell the memory manager to release everything.
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// NB: mem pointer is NULL if memory mgr failed to initialize.
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if (cinfo->mem != NULL)
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(*cinfo->mem->self_destruct) (cinfo);
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cinfo->mem = NULL; // be safe if jpeg_destroy is called twice
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cinfo->global_state = 0; // mark it destroyed
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}
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// * Convenience routines for allocating quantization and Huffman tables.
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// * (Would jutils.c be a more reasonable place to put these?)
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GLOBAL JQUANT_TBL *
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jpeg_alloc_quant_table (j_common_ptr cinfo)
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{
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JQUANT_TBL *tbl;
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tbl = (JQUANT_TBL *)
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(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
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tbl->sent_table = FALSE; // make sure this is false in any new table
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return tbl;
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}
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GLOBAL JHUFF_TBL *
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jpeg_alloc_huff_table (j_common_ptr cinfo)
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{
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JHUFF_TBL *tbl;
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tbl = (JHUFF_TBL *)
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(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
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tbl->sent_table = FALSE; // make sure this is false in any new table
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return tbl;
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}
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