michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  * iccprofile.h
michael@0:  *
michael@0:  * This file provides code to read and write International Color Consortium
michael@0:  * (ICC) device profiles embedded in JFIF JPEG image files.  The ICC has
michael@0:  * defined a standard format for including such data in JPEG "APP2" markers.
michael@0:  * The code given here does not know anything about the internal structure
michael@0:  * of the ICC profile data; it just knows how to put the profile data into
michael@0:  * a JPEG file being written, or get it back out when reading.
michael@0:  *
michael@0:  * This code depends on new features added to the IJG JPEG library as of
michael@0:  * IJG release 6b; it will not compile or work with older IJG versions.
michael@0:  *
michael@0:  * NOTE: this code would need surgery to work on 16-bit-int machines
michael@0:  * with ICC profiles exceeding 64K bytes in size.  See iccprofile.c
michael@0:  * for details.
michael@0:  */
michael@0: 
michael@0: #include <stdio.h>		/* needed to define "FILE", "NULL" */
michael@0: #include "jpeglib.h"
michael@0: 
michael@0: /*
michael@0:  * Reading a JPEG file that may contain an ICC profile requires two steps:
michael@0:  *
michael@0:  * 1. After jpeg_create_decompress() but before jpeg_read_header(),
michael@0:  *    call setup_read_icc_profile().  This routine tells the IJG library
michael@0:  *    to save in memory any APP2 markers it may find in the file.
michael@0:  *
michael@0:  * 2. After jpeg_read_header(), call read_icc_profile() to find out
michael@0:  *    whether there was a profile and obtain it if so.
michael@0:  */
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Prepare for reading an ICC profile
michael@0:  */
michael@0: 
michael@0: extern void setup_read_icc_profile JPP((j_decompress_ptr cinfo));
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * See if there was an ICC profile in the JPEG file being read;
michael@0:  * if so, reassemble and return the profile data.
michael@0:  *
michael@0:  * TRUE is returned if an ICC profile was found, FALSE if not.
michael@0:  * If TRUE is returned, *icc_data_ptr is set to point to the
michael@0:  * returned data, and *icc_data_len is set to its length.
michael@0:  *
michael@0:  * IMPORTANT: the data at **icc_data_ptr has been allocated with malloc()
michael@0:  * and must be freed by the caller with free() when the caller no longer
michael@0:  * needs it.  (Alternatively, we could write this routine to use the
michael@0:  * IJG library's memory allocator, so that the data would be freed implicitly
michael@0:  * at jpeg_finish_decompress() time.  But it seems likely that many apps
michael@0:  * will prefer to have the data stick around after decompression finishes.)
michael@0:  */
michael@0: 
michael@0: extern boolean read_icc_profile JPP((j_decompress_ptr cinfo,
michael@0: 				     JOCTET **icc_data_ptr,
michael@0: 				     unsigned int *icc_data_len));