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authorJörg Frings-Fürst <debian@jff-webhosting.net>2015-05-01 16:24:15 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2015-05-01 16:24:15 +0200
commita30ba67504ffd12c4db499adbb5ce47a7d1f6036 (patch)
tree9ae1a7e3849dda6bbb5c578232f6f2fa5b2e7e7e /jpeg/jcinit.c
parent89e99e8a827859729729dfc92d74be4a8f96f1a4 (diff)
parent094535c010320967639e8e86f974d878e80baa72 (diff)
New release 1.7.0
Diffstat (limited to 'jpeg/jcinit.c')
-rw-r--r--jpeg/jcinit.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/jpeg/jcinit.c b/jpeg/jcinit.c
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+++ b/jpeg/jcinit.c
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+/*
+ * jcinit.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains initialization logic for the JPEG compressor.
+ * This routine is in charge of selecting the modules to be executed and
+ * making an initialization call to each one.
+ *
+ * Logically, this code belongs in jcmaster.c. It's split out because
+ * linking this routine implies linking the entire compression library.
+ * For a transcoding-only application, we want to be able to use jcmaster.c
+ * without linking in the whole library.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Master selection of compression modules.
+ * This is done once at the start of processing an image. We determine
+ * which modules will be used and give them appropriate initialization calls.
+ */
+
+GLOBAL(void)
+jinit_compress_master (j_compress_ptr cinfo)
+{
+ /* Initialize master control (includes parameter checking/processing) */
+ jinit_c_master_control(cinfo, FALSE /* full compression */);
+
+ /* Preprocessing */
+ if (! cinfo->raw_data_in) {
+ jinit_color_converter(cinfo);
+ jinit_downsampler(cinfo);
+ jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
+ }
+ /* Forward DCT */
+ jinit_forward_dct(cinfo);
+ /* Entropy encoding: either Huffman or arithmetic coding. */
+ if (cinfo->arith_code)
+ jinit_arith_encoder(cinfo);
+ else {
+ jinit_huff_encoder(cinfo);
+ }
+
+ /* Need a full-image coefficient buffer in any multi-pass mode. */
+ jinit_c_coef_controller(cinfo,
+ (boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
+ jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
+
+ jinit_marker_writer(cinfo);
+
+ /* We can now tell the memory manager to allocate virtual arrays. */
+ (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
+
+ /* Write the datastream header (SOI) immediately.
+ * Frame and scan headers are postponed till later.
+ * This lets application insert special markers after the SOI.
+ */
+ (*cinfo->marker->write_file_header) (cinfo);
+}