You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.7 KiB
74 lines
2.7 KiB
4 years ago
|
/*
|
||
|
|
* iccprofile.h
|
||
|
|
*
|
||
|
|
* This file provides code to read and write International Color Consortium
|
||
|
|
* (ICC) device profiles embedded in JFIF JPEG image files. The ICC has
|
||
|
|
* defined a standard format for including such data in JPEG "APP2" markers.
|
||
|
|
* The code given here does not know anything about the internal structure
|
||
|
|
* of the ICC profile data; it just knows how to put the profile data into
|
||
|
|
* a JPEG file being written, or get it back out when reading.
|
||
|
|
*
|
||
|
|
* This code depends on new features added to the IJG JPEG library as of
|
||
|
|
* IJG release 6b; it will not compile or work with older IJG versions.
|
||
|
|
*
|
||
|
|
* NOTE: this code would need surgery to work on 16-bit-int machines
|
||
|
|
* with ICC profiles exceeding 64K bytes in size. See iccprofile.c
|
||
|
|
* for details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h> /* needed to define "FILE", "NULL" */
|
||
|
|
#include "jpeglib.h"
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This routine writes the given ICC profile data into a JPEG file.
|
||
|
|
* It *must* be called AFTER calling jpeg_start_compress() and BEFORE
|
||
|
|
* the first call to jpeg_write_scanlines().
|
||
|
|
* (This ordering ensures that the APP2 marker(s) will appear after the
|
||
|
|
* SOI and JFIF or Adobe markers, but before all else.)
|
||
|
|
*/
|
||
|
|
|
||
|
|
extern void write_icc_profile JPP((j_compress_ptr cinfo,
|
||
|
|
const JOCTET *icc_data_ptr,
|
||
|
|
unsigned int icc_data_len));
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Reading a JPEG file that may contain an ICC profile requires two steps:
|
||
|
|
*
|
||
|
|
* 1. After jpeg_create_decompress() but before jpeg_read_header(),
|
||
|
|
* call setup_read_icc_profile(). This routine tells the IJG library
|
||
|
|
* to save in memory any APP2 markers it may find in the file.
|
||
|
|
*
|
||
|
|
* 2. After jpeg_read_header(), call read_icc_profile() to find out
|
||
|
|
* whether there was a profile and obtain it if so.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Prepare for reading an ICC profile
|
||
|
|
*/
|
||
|
|
|
||
|
|
extern void setup_read_icc_profile JPP((j_decompress_ptr cinfo));
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* See if there was an ICC profile in the JPEG file being read;
|
||
|
|
* if so, reassemble and return the profile data.
|
||
|
|
*
|
||
|
|
* TRUE is returned if an ICC profile was found, FALSE if not.
|
||
|
|
* If TRUE is returned, *icc_data_ptr is set to point to the
|
||
|
|
* returned data, and *icc_data_len is set to its length.
|
||
|
|
*
|
||
|
|
* IMPORTANT: the data at **icc_data_ptr has been allocated with malloc()
|
||
|
|
* and must be freed by the caller with free() when the caller no longer
|
||
|
|
* needs it. (Alternatively, we could write this routine to use the
|
||
|
|
* IJG library's memory allocator, so that the data would be freed implicitly
|
||
|
|
* at jpeg_finish_decompress() time. But it seems likely that many apps
|
||
|
|
* will prefer to have the data stick around after decompression finishes.)
|
||
|
|
*/
|
||
|
|
|
||
|
|
extern boolean read_icc_profile JPP((j_decompress_ptr cinfo,
|
||
|
|
JOCTET **icc_data_ptr,
|
||
|
|
unsigned int *icc_data_len));
|