/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * iccjpeg.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. */ #ifndef mozilla_image_decoders_iccjpeg_h #define mozilla_image_decoders_iccjpeg_h #include <stdio.h> /* needed to define "FILE", "NULL" */ #include "jpeglib.h" /* * 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)); #endif // mozilla_image_decoders_iccjpeg_h