Initial commit

neo/renderer/jpeg-6/jcinit.cpp

@@ -0,0 +1,72 @@
+/*
+ * jcinit.c
+ *
+ * Copyright (C) 1991-1995, 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 ) {
+        ERREXIT( cinfo, JERR_ARITH_NOTIMPL );
+    } else {
+        if ( cinfo->progressive_mode ) {
+#ifdef C_PROGRESSIVE_SUPPORTED
+            jinit_phuff_encoder( cinfo );
+#else
+            ERREXIT( cinfo, JERR_NOT_COMPILED );
+#endif
+        } else {
+            jinit_huff_encoder( cinfo );
+        }
+    }
+
+    /* Need a full-image coefficient buffer in any multi-pass mode. */
+    jinit_c_coef_controller( cinfo,
+                            ( 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 );
+}