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-rw-r--r--src/jpeg_mem_dest.cc137
1 files changed, 0 insertions, 137 deletions
diff --git a/src/jpeg_mem_dest.cc b/src/jpeg_mem_dest.cc
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--- a/src/jpeg_mem_dest.cc
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-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/***************************************************************************
- * jpeg_mem_dest.cc
- *
- * Thu Jul 28 16:40:08 CEST 2005
- * Copyright 2005 Bent Bisballe
- * deva@aasimon.org
- ****************************************************************************/
-
-/*
- * This file is part of MIaV.
- *
- * MIaV is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * MIaV 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with MIaV; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- */
-#include <config.h>
-#include "jpeg_mem_dest.h"
-
-#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently ?? size */
-
-/* Expanded data destination object for stdio output */
-typedef struct {
- struct jpeg_destination_mgr pub; /* public fields */
-
- JOCTET * outbuff; /* target buffer */
- size_t * size;
-} mem_destination_mgr;
-
-typedef mem_destination_mgr * mem_dest_ptr;
-
-/*
- * Initialize destination --- called by jpeg_start_compress
- * before any data is actually written.
- */
-void init_destination (j_compress_ptr cinfo)
-{
- mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
-
- *dest->size = 0;
- dest->pub.next_output_byte = dest->outbuff;
- dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
-}
-
-/*
- * Terminate destination --- called by jpeg_finish_compress
- * after all data has been written. Usually needs to flush buffer.
- *
- * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
- * application must deal with any cleanup that should happen even
- * for error exit.
- */
-void term_destination (j_compress_ptr cinfo)
-{
- mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
- size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
-
- /* Write any data remaining in the buffer */
- if (datacount > 0) {
- dest->outbuff+=datacount;
- *dest->size+=datacount;
- }
-}
-
-/*
- * Empty the output buffer --- called whenever buffer fills up.
- *
- * In typical applications, this should write the entire output buffer
- * (ignoring the current state of next_output_byte & free_in_buffer),
- * reset the pointer & count to the start of the buffer, and return TRUE
- * indicating that the buffer has been dumped.
- *
- * In applications that need to be able to suspend compression due to output
- * overrun, a FALSE return indicates that the buffer cannot be emptied now.
- * In this situation, the compressor will return to its caller (possibly with
- * an indication that it has not accepted all the supplied scanlines). The
- * application should resume compression after it has made more room in the
- * output buffer. Note that there are substantial restrictions on the use of
- * suspension --- see the documentation.
- *
- * When suspending, the compressor will back up to a convenient restart point
- * (typically the start of the current MCU). next_output_byte & free_in_buffer
- * indicate where the restart point will be if the current call returns FALSE.
- * Data beyond this point will be regenerated after resumption, so do not
- * write it out when emptying the buffer externally.
- */
-boolean empty_output_buffer (j_compress_ptr cinfo)
-{
- mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
-
- dest->outbuff+=OUTPUT_BUF_SIZE;
- *dest->size+=OUTPUT_BUF_SIZE;
-
- dest->pub.next_output_byte = dest->outbuff;
- dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
-
- return TRUE;
-}
-
-/*
- * Prepare for output to a memory buffer.
- . The caller must have already allocated the buffer, and is responsible
- * for closing it after finishing compression.
- */
-void jpeg_mem_dest (j_compress_ptr cinfo, char * outbuff, size_t * size)
-{
- mem_dest_ptr dest;
-
- /* The destination object is made permanent so that multiple JPEG images
- * can be written to the same file without re-executing jpeg_stdio_dest.
- * This makes it dangerous to use this manager and a different destination
- * manager serially with the same JPEG object, because their private object
- * sizes may be different. Caveat programmer.
- */
- if (cinfo->dest == NULL) { /* first time for this JPEG object? */
- cinfo->dest = (struct jpeg_destination_mgr *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
- sizeof(mem_destination_mgr));
- }
-
- dest = (mem_dest_ptr) cinfo->dest;
- dest->pub.init_destination = init_destination;
- dest->pub.empty_output_buffer = empty_output_buffer;
- dest->pub.term_destination = term_destination;
- dest->outbuff = (JOCTET *)outbuff;
- dest->size = (size_t *)size;
-}