115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* jpegp.h
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*
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* Copyright (C) 1995, Erik Corry (ehcorry@inet.uni-c.dk)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* This stuff is very fragile wrt. changes in the sizes of the
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* jpeg library structures. It's a real good idea to be using libjpeg
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* version 6a or later; 6a added some defenses against structure mismatches.
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*/
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#ifndef JPEG_H_INCLUDED
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#define JPEG_H_INCLUDED 1
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#include <stdio.h>
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#include <sys/types.h> /* in case size_t is not defined by stdio.h */
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#include <setjmp.h>
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#include "image_format.h"
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/*
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* Unfortunately libjpeg uses some of the same configuration symbols
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* as Chimera. Undef'ing these symbols here is not essential, but it
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* prevents macro-redefinition warnings from gcc and like-minded compilers.
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*/
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#undef HAVE_PROTOTYPES
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#undef HAVE_UNSIGNED_CHAR
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#undef HAVE_UNSIGNED_SHORT
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#undef HAVE_STDDEF_H
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#undef HAVE_STDLIB_H
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#include "jpeglib.h"
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#include "jerror.h"
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/*
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* Each of these structures begins with a jpeg library struct,
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* followed by chimera extension fields. This lets us cast pointers
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* back and forth between the structs known to the library and the
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* full struct definitions. Poor man's subclassing, if you like.
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*/
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struct jpeg_chimera_error_state
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{
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struct jpeg_error_mgr pub; /* - this struct comes from jpeg lib */
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jmp_buf jump_buffer; /* usually an array of sorts from setjmp.h */
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};
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struct jpeg_chimera_input_state
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{
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struct jpeg_source_mgr pub; /* - this struct comes from jpeg lib */
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int bytes_consumed; /* # bytes already consumed by jpeg lib */
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bool at_eof; /* indicates we've gotten the whole file */
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bool faked_eoi; /* indicates next_input_byte is phony */
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JOCTET fake_eoi[2]; /* workspace for making a fake EOI */
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};
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/*
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* jpegState
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*/
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typedef struct jpeg_state
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{
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struct jpeg_decompress_struct cinfo; /* - this struct comes from jpeg lib */
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struct jpeg_chimera_error_state error_state; /* subsidiary structures */
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struct jpeg_chimera_input_state input_state;
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bool destroy_jpeg; /* indicates we need to call jpeg_destroy */
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int state; /* state of JPEG reader */
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JDIMENSION ypos; /* current scanline number */
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FormatLineProc lineProc; /* line callback */
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void *lineClosure; /* closure for callback */
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Image *image;
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Intensity cmap[256]; /* room for making a grayscale palette */
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} jpegState;
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/*
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* state of JPEG reader
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*/
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#define CH_JPEG_READ_HEADER 1
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#define CH_JPEG_START_DECOMPRESS 2
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#define CH_JPEG_START_OUTPUT 3
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#define CH_JPEG_READ_IMAGE 4
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#define CH_JPEG_FINISH_OUTPUT 5
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#define CH_JPEG_FINISH_DECOMPRESS 6
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#define CH_JPEG_FINISHED 0
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/*
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* return values from jpeg processing fns
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* NOTE: CH_JPEG_FINISHED is also used as a return value!
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*/
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#define CH_JPEG_SUCCESS 1
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#define CH_JPEG_NEED_DATA 2
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#define CH_JPEG_ERROR 3
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#endif
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