jpg_enc.c

一个用于jpg数据编解压缩的库

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

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer Software License
 * 
 * IMAGE POWER JPEG-2000 PUBLIC LICENSE
 * ************************************
 * 
 * WHEREAS:
 * 
 * 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
 * the right to use, copy, modify, merge, publish, distribute, sublicense,
 * 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.
 * 
 * B.  Redistributions in binary form must reproduce the above copyright
 * notice, and this list of conditions, and the following disclaimer in
 * the documentation and/or other materials provided with the distribution.
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 * C.  Neither the name of Image Power, Inc. nor any other contributor
 * (including, but not limited to, the University of British Columbia and
 * Michael David Adams) may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * D.  User agrees that it shall not commence any action against Image Power,
 * Inc., the University of British Columbia, Michael David Adams, or any
 * other contributors (collectively "Licensors") for infringement of any
 * intellectual property rights ("IPR") held by the User in respect of any
 * technology that User owns or has a right to license or sublicense and
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 * E.  If User commences an infringement action against any Licensor(s) then
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 * 
 * F.  This software is for use only in hardware or software products that
 * are compliant with ISO/IEC 15444-1 (i.e., JPEG-2000 Part 1).  No license
 * or right to this Software is granted for products that do not comply
 * with ISO/IEC 15444-1.  The JPEG-2000 Part 1 standard can be purchased
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 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.
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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 "jpg_jpeglib.h"
#include "jpg_cod.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_src_t;


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)
{
	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;

	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, 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;
}

static void jpg_finish_input(j_compress_ptr cinfo, struct jpg_src_s *sinfo)
{
}

/******************************************************************************\
* Code for save operation.
\******************************************************************************/

/* Save an image to a stream in the the JPG format. */

int jpg_encode(jas_image_t *image, jas_stream_t *out, char *optstr)
{
	JDIMENSION numscanlines;
	struct jpeg_compress_struct cinfo;
	struct jpeg_error_mgr jerr;
	uint_fast32_t width;
	uint_fast32_t height;
	int numcmpts;
	jpg_src_t src_mgr_buf;
	jpg_src_t *src_mgr = &src_mgr_buf;
	FILE *output_file;
	int cmptno;

	output_file = 0;

	width = jas_image_width(image);
	height = jas_image_height(image);
	numcmpts = jas_image_numcmpts(image);

	for (cmptno = 0; cmptno < numcmpts; ++cmptno) {
		if (jas_image_cmptwidth(image, cmptno) != width ||
		  jas_image_cmptheight(image, cmptno) != height ||
		  jas_image_cmpttlx(image, cmptno) != 0 ||
		  jas_image_cmpttly(image, cmptno) != 0 ||
		  jas_image_cmpthstep(image, cmptno) != 1 ||
		  jas_image_cmptvstep(image, cmptno) != 1 ||
		  jas_image_cmptprec(image, cmptno) != 8 ||
		  jas_image_cmptsgnd(image, cmptno) != false) {
			fprintf(stderr, "The JPG encoder cannot handle an image with this geometry.\n");
			return -1;
		}
	}

	if (!(output_file = tmpfile())) {
		goto error;
	}

	/* Create a JPEG compression object. */
	cinfo.err = jpeg_std_error(&jerr);
	jpeg_create_compress(&cinfo);

	/* Specify data destination for compression */
	jpeg_stdio_dest(&cinfo, output_file);

	cinfo.in_color_space = (numcmpts == 3) ? JCS_RGB : JCS_GRAYSCALE;
	cinfo.image_width = width;
	cinfo.image_height = height;
	cinfo.input_components = numcmpts;
	jpeg_set_defaults(&cinfo);

	src_mgr->error = 0;
	src_mgr->image = image;
	src_mgr->data = jas_matrix_create(1, width);
	src_mgr->buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo,
	  JPOOL_IMAGE, (JDIMENSION) width * cinfo.input_components,
	  (JDIMENSION) 1);
	src_mgr->buffer_height = 1;

	/* Read the input file header to obtain file size & colorspace. */
	jpg_start_input(&cinfo, src_mgr);

	/* Now that we know input colorspace, fix colorspace-dependent defaults */
	jpeg_default_colorspace(&cinfo);

	/* Start compressor */
	jpeg_start_compress(&cinfo, TRUE);

	/* Process data */
	while (cinfo.next_scanline < cinfo.image_height) {
		if ((numscanlines = jpg_get_pixel_rows(&cinfo, src_mgr)) <= 0) {
			break;
		}
		jpeg_write_scanlines(&cinfo, src_mgr->buffer, numscanlines);
	}

	/* Finish compression and release memory */
	jpg_finish_input(&cinfo, src_mgr);
	jpeg_finish_compress(&cinfo);
	jpeg_destroy_compress(&cinfo);

	rewind(output_file);
	jpg_copyfiletostream(out, output_file);
	fclose(output_file);
	output_file = 0;

	return 0;

error:
	if (output_file) {
		fclose(output_file);
	}
	return -1;
}