mirror of https://gitee.com/openkylin/gimp.git
264 lines
8.9 KiB
C
264 lines
8.9 KiB
C
/* jpeg-icc.c
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/* This code was originally copied from the jpegicc tool as found in
|
|
* the lcms source code. This code comes with the following copyright
|
|
* notice:
|
|
*
|
|
* Little cms
|
|
* Copyright (C) 1998-2004 Marti Maria
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person
|
|
* obtaining a copy of this software and associated documentation
|
|
* files (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use, copy,
|
|
* modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
* of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*/
|
|
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <jpeglib.h>
|
|
|
|
#include <glib.h>
|
|
|
|
#include "jpeg-icc.h"
|
|
|
|
|
|
/*
|
|
* Since an ICC profile can be larger than the maximum size of a JPEG
|
|
* marker (64K), we need provisions to split it into multiple markers.
|
|
* The format defined by the ICC specifies one or more APP2 markers
|
|
* containing the following data:
|
|
*
|
|
* Identifying string ASCII "ICC_PROFILE\0" (12 bytes)
|
|
* Marker sequence number 1 for first APP2, 2 for next, etc (1 byte)
|
|
* Number of markers Total number of APP2's used (1 byte)
|
|
* Profile data (remainder of APP2 data)
|
|
|
|
* Decoders should use the marker sequence numbers to reassemble the
|
|
* profile, rather than assuming that the APP2 markers appear in the
|
|
* correct sequence.
|
|
*/
|
|
|
|
#define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */
|
|
#define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */
|
|
#define MAX_BYTES_IN_MARKER 65533 /* maximum data len of a JPEG marker */
|
|
#define MAX_DATA_BYTES_IN_MARKER (MAX_BYTES_IN_MARKER - ICC_OVERHEAD_LEN)
|
|
|
|
|
|
/*
|
|
* 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.)
|
|
*/
|
|
|
|
void
|
|
jpeg_icc_write_profile (j_compress_ptr cinfo,
|
|
const guchar *icc_data_ptr,
|
|
guint icc_data_len)
|
|
{
|
|
unsigned int num_markers; /* total number of markers we'll write */
|
|
int cur_marker = 1; /* per spec, counting starts at 1 */
|
|
unsigned int length; /* number of bytes to write in this marker */
|
|
|
|
/* Calculate the number of markers we'll need, rounding up of course */
|
|
num_markers = icc_data_len / MAX_DATA_BYTES_IN_MARKER;
|
|
if (num_markers * MAX_DATA_BYTES_IN_MARKER != icc_data_len)
|
|
num_markers++;
|
|
|
|
while (icc_data_len > 0) {
|
|
/* length of profile to put in this marker */
|
|
length = icc_data_len;
|
|
if (length > MAX_DATA_BYTES_IN_MARKER)
|
|
length = MAX_DATA_BYTES_IN_MARKER;
|
|
icc_data_len -= length;
|
|
|
|
/* Write the JPEG marker header (APP2 code and marker length) */
|
|
jpeg_write_m_header(cinfo, ICC_MARKER,
|
|
(unsigned int) (length + ICC_OVERHEAD_LEN));
|
|
|
|
/* Write the marker identifying string "ICC_PROFILE" (null-terminated).
|
|
* We code it in this less-than-transparent way so that the code works
|
|
* even if the local character set is not ASCII.
|
|
*/
|
|
jpeg_write_m_byte(cinfo, 0x49);
|
|
jpeg_write_m_byte(cinfo, 0x43);
|
|
jpeg_write_m_byte(cinfo, 0x43);
|
|
jpeg_write_m_byte(cinfo, 0x5F);
|
|
jpeg_write_m_byte(cinfo, 0x50);
|
|
jpeg_write_m_byte(cinfo, 0x52);
|
|
jpeg_write_m_byte(cinfo, 0x4F);
|
|
jpeg_write_m_byte(cinfo, 0x46);
|
|
jpeg_write_m_byte(cinfo, 0x49);
|
|
jpeg_write_m_byte(cinfo, 0x4C);
|
|
jpeg_write_m_byte(cinfo, 0x45);
|
|
jpeg_write_m_byte(cinfo, 0x0);
|
|
|
|
/* Add the sequencing info */
|
|
jpeg_write_m_byte(cinfo, cur_marker);
|
|
jpeg_write_m_byte(cinfo, (int) num_markers);
|
|
|
|
/* Add the profile data */
|
|
while (length--) {
|
|
jpeg_write_m_byte(cinfo, *icc_data_ptr);
|
|
icc_data_ptr++;
|
|
}
|
|
cur_marker++;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Handy subroutine to test whether a saved marker is an ICC profile marker.
|
|
*/
|
|
|
|
static boolean
|
|
marker_is_icc (jpeg_saved_marker_ptr marker)
|
|
{
|
|
return
|
|
marker->marker == ICC_MARKER &&
|
|
marker->data_length >= ICC_OVERHEAD_LEN &&
|
|
/* verify the identifying string */
|
|
GETJOCTET(marker->data[0]) == 0x49 &&
|
|
GETJOCTET(marker->data[1]) == 0x43 &&
|
|
GETJOCTET(marker->data[2]) == 0x43 &&
|
|
GETJOCTET(marker->data[3]) == 0x5F &&
|
|
GETJOCTET(marker->data[4]) == 0x50 &&
|
|
GETJOCTET(marker->data[5]) == 0x52 &&
|
|
GETJOCTET(marker->data[6]) == 0x4F &&
|
|
GETJOCTET(marker->data[7]) == 0x46 &&
|
|
GETJOCTET(marker->data[8]) == 0x49 &&
|
|
GETJOCTET(marker->data[9]) == 0x4C &&
|
|
GETJOCTET(marker->data[10]) == 0x45 &&
|
|
GETJOCTET(marker->data[11]) == 0x0;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* NOTE: if the file contains invalid ICC APP2 markers, we just silently
|
|
* return FALSE. You might want to issue an error message instead.
|
|
*/
|
|
|
|
gboolean
|
|
jpeg_icc_read_profile (j_decompress_ptr cinfo,
|
|
guchar **icc_data_ptr,
|
|
guint *icc_data_len)
|
|
{
|
|
jpeg_saved_marker_ptr marker;
|
|
int num_markers = 0;
|
|
int seq_no;
|
|
JOCTET *icc_data;
|
|
unsigned int total_length;
|
|
#define MAX_SEQ_NO 255 /* sufficient since marker numbers are bytes */
|
|
char marker_present[MAX_SEQ_NO+1]; /* 1 if marker found */
|
|
unsigned int data_length[MAX_SEQ_NO+1]; /* size of profile data in marker */
|
|
unsigned int data_offset[MAX_SEQ_NO+1]; /* offset for data in marker */
|
|
|
|
*icc_data_ptr = NULL; /* avoid confusion if FALSE return */
|
|
*icc_data_len = 0;
|
|
|
|
/* This first pass over the saved markers discovers whether there are
|
|
* any ICC markers and verifies the consistency of the marker numbering.
|
|
*/
|
|
|
|
for (seq_no = 1; seq_no <= MAX_SEQ_NO; seq_no++)
|
|
marker_present[seq_no] = 0;
|
|
|
|
for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
|
|
if (marker_is_icc(marker)) {
|
|
if (num_markers == 0)
|
|
num_markers = GETJOCTET(marker->data[13]);
|
|
else if (num_markers != GETJOCTET(marker->data[13]))
|
|
return FALSE; /* inconsistent num_markers fields */
|
|
seq_no = GETJOCTET(marker->data[12]);
|
|
if (seq_no <= 0 || seq_no > num_markers)
|
|
return FALSE; /* bogus sequence number */
|
|
if (marker_present[seq_no])
|
|
return FALSE; /* duplicate sequence numbers */
|
|
marker_present[seq_no] = 1;
|
|
data_length[seq_no] = marker->data_length - ICC_OVERHEAD_LEN;
|
|
}
|
|
}
|
|
|
|
if (num_markers == 0)
|
|
return FALSE;
|
|
|
|
/* Check for missing markers, count total space needed,
|
|
* compute offset of each marker's part of the data.
|
|
*/
|
|
|
|
total_length = 0;
|
|
for (seq_no = 1; seq_no <= num_markers; seq_no++) {
|
|
if (marker_present[seq_no] == 0)
|
|
return FALSE; /* missing sequence number */
|
|
data_offset[seq_no] = total_length;
|
|
total_length += data_length[seq_no];
|
|
}
|
|
|
|
if (total_length <= 0)
|
|
return FALSE; /* found only empty markers? */
|
|
|
|
/* Allocate space for assembled data */
|
|
icc_data = g_try_malloc (total_length * sizeof(JOCTET));
|
|
if (icc_data == NULL)
|
|
return FALSE; /* oops, out of memory */
|
|
|
|
/* and fill it in */
|
|
for (marker = cinfo->marker_list; marker != NULL; marker = marker->next) {
|
|
if (marker_is_icc(marker)) {
|
|
JOCTET FAR *src_ptr;
|
|
JOCTET *dst_ptr;
|
|
unsigned int length;
|
|
seq_no = GETJOCTET(marker->data[12]);
|
|
dst_ptr = icc_data + data_offset[seq_no];
|
|
src_ptr = marker->data + ICC_OVERHEAD_LEN;
|
|
length = data_length[seq_no];
|
|
while (length--) {
|
|
*dst_ptr++ = *src_ptr++;
|
|
}
|
|
}
|
|
}
|
|
|
|
*icc_data_ptr = icc_data;
|
|
*icc_data_len = total_length;
|
|
|
|
return TRUE;
|
|
}
|