jpg_enc.c

用C语言实现的JPEG编码

/*
 * Copyright (c) 2001-2003 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer Software License
 * 
 * IMAGE POWER JPEG-2000 PUBLIC LICENSE
 * ************************************
 * 
 * GRANT:
 * 
 * Permission is hereby granted, free of charge, to any person (the "User")
 * obtaining a copy of this software and associated documentation, to deal
 * in the JasPer Software without restriction, including without limitation
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 * and/or sell copies of the JasPer Software (in source and binary forms),
 * and to permit persons to whom the JasPer Software is furnished to do so,
 * provided further that the License Conditions below are met.
 * 
 * License Conditions
 * ******************
 * 
 * A.  Redistributions of source code must retain the above copyright notice,
 * and this list of conditions, and the following disclaimer.
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 * B.  Redistributions in binary form must reproduce the above copyright
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 * C.  Neither the name of Image Power, Inc. nor any other contributor
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 * Michael David Adams) may be used to endorse or promote products derived
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 * D.  User agrees that it shall not commence any action against Image Power,
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 * MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
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 * __END_OF_JASPER_LICENSE__
 */

/******************************************************************************\
* Includes.
\******************************************************************************/

#include <assert.h>
#include "jasper/jas_types.h"

#include "jasper/jas_tvp.h"
#include "jasper/jas_stream.h"
#include "jasper/jas_image.h"
#include "jasper/jas_string.h"
#include "jasper/jas_debug.h"

#include "jpg_jpeglib.h"
#include "jpg_cod.h"
#include "jpg_enc.h"

/******************************************************************************\
* Types.
\******************************************************************************/

typedef struct jpg_src_s {

	/* Output buffer. */
	JSAMPARRAY buffer;

	/* Height of output buffer. */
	JDIMENSION buffer_height;

	/* The current row. */
	JDIMENSION row;

	/* The image used to hold the decompressed sample data. */
	jas_image_t *image;

	/* The row buffer. */
	jas_matrix_t *data;

	/* The error indicator.  If this is nonzero, something has gone wrong
	  during decompression. */
	int error;

	jpg_enc_t *enc;

} jpg_src_t;

typedef struct {
	int qual;
} jpg_encopts_t;

typedef enum {
	OPT_QUAL
} jpg_optid_t;

jas_taginfo_t jpg_opttab[] = {
	{OPT_QUAL, "quality"},
	{-1, 0}
};

/******************************************************************************\
* Local prototypes.
\******************************************************************************/

static int jpg_copyfiletostream(jas_stream_t *out, FILE *in);
static void jpg_start_input(j_compress_ptr cinfo, struct jpg_src_s *sinfo);
static JDIMENSION jpg_get_pixel_rows(j_compress_ptr cinfo, struct jpg_src_s *sinfo);
static void jpg_finish_input(j_compress_ptr cinfo, struct jpg_src_s *sinfo);
static int tojpgcs(int colorspace);
static int jpg_parseencopts(char *optstr, jpg_encopts_t *encopts);

/******************************************************************************\
*
\******************************************************************************/

static int jpg_copyfiletostream(jas_stream_t *out, FILE *in)
{
	int c;
	while ((c = fgetc(in)) != EOF) {
		if (jas_stream_putc(out, c) == EOF) {
			return -1;
		}
	}
	return 0;
}

static void jpg_start_input(j_compress_ptr cinfo, struct jpg_src_s *sinfo)
{
	/* Avoid compiler warnings about unused parameters. */
	cinfo = 0;

	sinfo->row = 0;
}

static JDIMENSION jpg_get_pixel_rows(j_compress_ptr cinfo, struct jpg_src_s *sinfo)
{
	JSAMPLE *bufptr;
	int i;
	int cmptno;
	int width;
	int *cmpts;

	cmpts = sinfo->enc->cmpts;

	width = jas_image_width(sinfo->image);

	if (sinfo->error) {
		return 0;
	}
	for (cmptno = 0; cmptno < cinfo->input_components; ++cmptno) {
		if (jas_image_readcmpt(sinfo->image, cmpts[cmptno], 0, sinfo->row, width, 1, sinfo->data)) {
			;
		}
		bufptr = (sinfo->buffer[0]) + cmptno;
		for (i = 0; i < width; ++i) {
			*bufptr = jas_matrix_get(sinfo->data, 0, i);
			bufptr += cinfo->input_components;
		}
	}
	++sinfo->row;
	return 1;
}