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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /image/decoders/iccjpeg.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* 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