Revised ix for 687718 The tiffsep device fails when thesize of gx_color_index is 32 bits

Index: src/gdevtsep.c
===================================================================
RCS file: /cvs/ghostscript/gs/src/gdevtsep.c,v
retrieving revision 1.4
diff -u -r1.4 gdevtsep.c
--- src/gdevtsep.c	20 Sep 2004 21:42:12 -0000	1.4
+++ src/gdevtsep.c	29 Sep 2004 22:57:19 -0000
@@ -381,18 +381,24 @@
 	{ 0 }			/* separation files */
 
 /*
+ * Select the default number of components based upon the number of bits
+ * that we have in a gx_color_index
+ */
+#define NC ((sizeof(gx_color_index) <= 8) ? sizeof(gx_color_index) : 8)
+
+/*
  * TIFF device with CMYK process color model and spot color support.
  */
 private const gx_device_procs spot_cmyk_procs = device_procs;
 
 const tiffsep_device gs_tiffsep_device =
 {   
-    tiffsep_device_body(spot_cmyk_procs, "tiffsep", 8, GX_CINFO_POLARITY_SUBTRACTIVE, 64, MAX_COLOR_VALUE, MAX_COLOR_VALUE, "DeviceCMYK"),
+    tiffsep_device_body(spot_cmyk_procs, "tiffsep", NC, GX_CINFO_POLARITY_SUBTRACTIVE, NC * 8, MAX_COLOR_VALUE, MAX_COLOR_VALUE, "DeviceCMYK"),
     /* devn_params specific parameters */
-    { 8,	/* Bits per color - must match ncomp, depth, etc. above */
+    { 8,		/* Bits per color - must match ncomp, depth, etc. above */
       DeviceCMYKComponents,	/* Names of color model colorants */
       4,			/* Number colorants for CMYK */
-      8,			/* MaxSeparations:  our current limit is 8 bytes */
+      NC,			/* MaxSeparations:  our current limit is 8 bytes */
       {0},			/* SeparationNames */
       {0},			/* SeparationOrder names */
       {0, 1, 2, 3, 4, 5, 6, 7 }	/* Initial component SeparationOrder */
@@ -400,6 +406,8 @@
     { true },			/* equivalent CMYK colors for spot colors */
 };
 
+#undef NC
+
 /*
  * The following procedures are used to map the standard color spaces into
  * the color components for the tiffsep device.
Index: src/gdevpsd.c
===================================================================
RCS file: /cvs/ghostscript/gs/src/gdevpsd.c,v
retrieving revision 1.17
diff -u -r1.17 gdevpsd.c
--- src/gdevpsd.c	15 Sep 2004 11:46:41 -0000	1.17
+++ src/gdevpsd.c	29 Sep 2004 22:57:20 -0000
@@ -245,6 +245,12 @@
 };
 
 /*
+ * Select the default number of components based upon the number of bits
+ * that we have in a gx_color_index
+ */
+#define NC ((sizeof(gx_color_index) <= 8) ? sizeof(gx_color_index) : 8)
+
+/*
  * PSD device with CMYK process color model and spot color support.
  */
 private const gx_device_procs spot_cmyk_procs
@@ -252,7 +258,7 @@
 
 const psd_device gs_psdcmyk_device =
 {   
-    psd_device_body(spot_cmyk_procs, "psdcmyk", 4, GX_CINFO_POLARITY_SUBTRACTIVE, 32, 255, 255, "DeviceCMYK"),
+    psd_device_body(spot_cmyk_procs, "psdcmyk", NC, GX_CINFO_POLARITY_SUBTRACTIVE, NC * 8, 255, 255, "DeviceCMYK"),
     /* devn_params specific parameters */
     { 8,	/* Bits per color - must match ncomp, depth, etc. above */
       DeviceCMYKComponents,	/* Names of color model colorants */
@@ -267,6 +273,8 @@
     psd_DEVICE_CMYK,		/* Color model */
 };
 
+#undef NC
+
 /*
  * The following procedures are used to map the standard color spaces into
  * the color components for the psdrgb device.
Index: doc/Devices.htm
===================================================================
RCS file: /cvs/ghostscript/gs/doc/Devices.htm,v
retrieving revision 1.81
diff -u -r1.81 Devices.htm
--- doc/Devices.htm	28 Aug 2004 21:52:56 -0000	1.81
+++ doc/Devices.htm	29 Sep 2004 22:57:21 -0000
@@ -335,6 +335,9 @@
 <dd>Produces 32-bit CMYK output (8 bits per component).
 <dt><b><tt>tiffsep</tt></b>
 <dd>
+The tiffsep device is a CMYK device with support for spot colors.
+
+<p>
 The tiffsep device creates multiple output files.  The device creates a single
 32 bit composite CMYK file (tiff32nc format) and multiple tiffgray files.
 A tiffgray file is created for each separation.
@@ -344,8 +347,9 @@
 CMYK data. This data is based upon the CMYK data within the file plus 
 an equivalent CMYK color for each spot colors which is present. The equivalent
 CMYK color for each spot colors is determined using the alternate tint transform
-function specified in Separation and DeviceN color spaces. Since 
-this file is created based upon having color planes for each colorant, the
+function specified in Separation and DeviceN color spaces.  The basic purpose of
+this file is to present the overall appearance of the input data. Since 
+this file is created based upon having separate color planes for each colorant, the
 file will correctly represent the appearance of overprinting with spot colors.
 
 <p>
@@ -366,17 +370,11 @@
 spot color numbers are not affected by the SeparationOrder parameter.
 
 <p>
-The names of spot colors may be specified via the SeparationColorNames device
-parameters.  Or the tiffsep device will automatically recognize spot color
-names if <b><tt>-dMaxSeparations=8</tt></b> is specified on the
-command line.
-
-<p>
-If only a subset of the colorants for a file is desired then the separations
-to be output can be selected via the SeparationOrder
-device parameter.  When colorants are selected via the
-SeparationOrder parameter, the composite CMYK output contains
-the equivalent CMYK data only for the selected colorants.  
+The tiffsep device will automatically recognize spot color names.
+The SeparationColorNames device parameter can also be used to specify
+the names of spot colors. Ghostcript automatically assumes that Cyan, Magenta,
+Yellow, and Black are present as colorants for the tiffsep device. Thus it is
+not necessary to specify these colorants explicitly.
 
 <p>
 The tiffsep device also prints the names of any spot colors
@@ -387,18 +385,41 @@
 the names of spot colors with a document.
 
 <p>
-Ghostscript currently limits the size of a pixel to 64 bits.
+If only a subset of the colorants for a file is desired then the separations
+to be output can be selected via the SeparationOrder
+device parameter.  When colorants are selected via the
+SeparationOrder parameter, the composite CMYK output contains
+the equivalent CMYK data only for the selected colorants. For example, if the
+source file has spot colors named orange, green, and purple, the
+following command line will create separations for the cyan, orange, and
+purple colorants.  The composite CMYK file will only represent the appearance
+of the cyan, orange, and purple colorants.
+
+<blockquote>
+<kbd>gs -sDEVICE=tiffsep -sOutputFile=foo.tif -c "<< SeparationColorNames
+[ /orange /green /purple ] /SeparationOrder [ /cyan /orange /purple ] >>
+setpagedevice" -f foo.ps</kbd>
+</blockquote>
+
+<p>
+Ghostscript currently limits the size of a pixel to 64 bits with most compilers.
+(See the description of gx_color_index in <a href="Drivers.htm#Types">Types</a>.)
 Since the tiffsep device uses 8 bits per colorant,  the device can handle
 a maximum of 8 colorants per pass.  However it is possible to
 handle more than 8 colorants by doing multiple passes.  For each
-pass after the first one, the names of all of the separations need
+pass after the first one, the names of all of the spot colors need
 to be specified via the SeparationColorNames parameter and the
 names of the desired separations need to be specified via the
 SeparationOrder parameter.  It is
 possible to create an overall CMYK composite for more than 8
 colorants by then adding together (via an external application like
 imagemagick) the composite CMYK output files from the individual
-Ghostscript passes.
+Ghostscript passes. For those compilers which only support a 32 bit value
+for gx_color_index, only 4 separations may be generated per pass and the
+SeparationColorNames and SeparationOrder device parameters
+must be used to obtain separations for spot colors.
+
+<p>
 </dl>
 </blockquote>