From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- image/decoders/iccjpeg.h | 67 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 image/decoders/iccjpeg.h (limited to 'image/decoders/iccjpeg.h') diff --git a/image/decoders/iccjpeg.h b/image/decoders/iccjpeg.h new file mode 100644 index 000000000..474df719c --- /dev/null +++ b/image/decoders/iccjpeg.h @@ -0,0 +1,67 @@ +/* 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 /* 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 -- cgit v1.2.3