ENH: Final -hopefully- change to jpeg lib. In order to match ITK structure, and be...

[gdcm.git] / src / gdcmjpeg / jclossy.c

diff --git a/src/gdcmjpeg/jclossy.c b/src/gdcmjpeg/jclossy.c
new file mode 100644 (file)
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--- /dev/null
+++ b/src/gdcmjpeg/jclossy.c
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+/*
+ * jclossy.c
+ *
+ * Copyright (C) 1998, 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 the control logic for the lossy JPEG compressor.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jlossy.h"
+
+
+/*
+ * Initialize for a processing pass.
+ */
+
+METHODDEF(void)
+start_pass (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
+{
+  j_lossy_c_ptr lossyc = (j_lossy_c_ptr) cinfo->codec;
+
+  (*lossyc->fdct_start_pass) (cinfo);
+  (*lossyc->coef_start_pass) (cinfo, pass_mode);
+}
+
+
+/*
+ * Initialize the lossy compression codec.
+ * This is called only once, during master selection.
+ */
+
+GLOBAL(void)
+jinit_lossy_c_codec (j_compress_ptr cinfo)
+{
+  j_lossy_c_ptr lossyc;
+
+  /* Create subobject in permanent pool */
+  lossyc = (j_lossy_c_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+        SIZEOF(jpeg_lossy_c_codec));
+  cinfo->codec = (struct jpeg_c_codec *) lossyc;
+
+  /* Initialize sub-modules */
+
+  /* Forward DCT */
+  jinit_forward_dct(cinfo);
+  /* Entropy encoding: either Huffman or arithmetic coding. */
+  if (cinfo->arith_code) {
+    jinit_arith_encoder(cinfo);
+  } else {
+    if (cinfo->process == JPROC_PROGRESSIVE) {
+#ifdef C_PROGRESSIVE_SUPPORTED
+      jinit_phuff_encoder(cinfo);
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    } else
+      jinit_shuff_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));
+
+  /* Initialize method pointers.
+   *
+   * Note: entropy_start_pass and entropy_finish_pass are assigned in
+   * jcshuff.c or jcphuff.c and compress_data is assigned in jccoefct.c.
+   */
+  lossyc->pub.start_pass = start_pass;
+}