1 files changed, 102 insertions, 0 deletions
diff --git a/gs/base/gdevstc3.c b/gs/base/gdevstc3.c
new file mode 100644
index 000000000..d40617c22
--- /dev/null
+++ b/gs/base/gdevstc3.c
@@ -0,0 +1,102 @@
+/* Copyright (C) 2001-2006 Artifex Software, Inc.
+   All Rights Reserved.
+  
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied, modified
+   or distributed except as expressly authorized under the terms of that
+   license.  Refer to licensing information at http://www.artifex.com/
+   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
+   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
+*/
+
+/* $Id$*/
+/* Epson Stylus-Color Printer-Driver */
+
+/***
+     This file holds the sample-implementation of a RGB-algorithm for
+     the stcolor-driver. It is available via
+
+          gs -sDEVICE=stcolor -sDithering=gsrgb ...
+
+     Actually this is no dithering-algorithm, it lets ghostscript do the job.
+     This achieved, by requesting BYTE-Values between 0 and 1 to be delivered,
+     which causes a depth of 1-Bit by default.
+
+ ***/
+
+/*
+ * gdevstc.h holds all the includes and the driver-specific definitions, so
+ * it is the only include you need. To add a new algorthim, STC_MODI in
+ * gdevstc.h should be extended. (see the instructions there)
+ */
+
+#include "gdevstc.h"
+
+/*
+ * the routine required.
+ */
+
+/*ARGSUSED*/
+int 
+stc_gsrgb(stcolor_device *sdev,int npixel,byte *ip,byte *buf,byte *out)
+{
+
+   int   error = 0;
+
+/*
+ * There are basically 3 Types of calls:
+ * npixel < 0    => initialize buf, if this is required
+ *                  (happens only if requested)
+ * npixel > 0    => process next scanline, if the flag STC_WHITE is set, then
+ *                  in == NULL signals, that the basic-driver has decided
+ *                  that this scanline is white. (Useful for really dithering
+ *                  drivers)
+ */
+
+/* ============================================================= */
+   if(npixel > 0) {  /* npixel >  0 -> scanline-processing       */
+/* ============================================================= */
+
+      int p;
+
+/*
+ *    simply merge the color-values into a single byte 
+ *    (RED, GREEN, BLUE are defined in gdevstc.h)
+ */
+      for(p = 0; p < npixel; ++p,++out) { /* loop over pixels */
+
+         *out = 0;
+         if(*ip++) *out |= RED;
+         if(*ip++) *out |= GREEN;
+         if(*ip++) *out |= BLUE;
+
+      }                                   /* loop over pixels */
+
+/* ============================================================= */
+   } else {          /* npixel <= 0 -> initialisation            */
+/* ============================================================= */
+/*
+ * besides buffer-Initialisation, one may check the parameters in
+ * the algorithm-table of the driver.
+ */
+
+/*    we didn't check for the white-calls above, so they would cause errors */
+      if(sdev->stc.dither->flags & STC_WHITE)              error = -1;
+
+/*    if we're not setup for bytes, this is an error too */
+      if((sdev->stc.dither->flags & STC_TYPE) != STC_BYTE) error = -2;
+
+/*    and rgb-mode is the only supported mode */
+      if(sdev->color_info.num_components != 3)             error = -3;
+
+/*    we can't deal with ghostscript-data directly. */
+      if(sdev->stc.dither->flags & STC_DIRECT)             error = -4;
+
+/* ============================================================= */
+   } /* scanline-processing or initialisation */
+/* ============================================================= */
+
+   return error;
+}