Initial revision

1 files changed, 1163 insertions, 0 deletions

diff --git a/generic/tkCanvPs.c b/generic/tkCanvPs.c
new file mode 100644
index 0000000..9bad194
--- /dev/null
+++ b/generic/tkCanvPs.c
@@ -0,0 +1,1163 @@
+/* 
+ * tkCanvPs.c --
+ *
+ *	This module provides Postscript output support for canvases,
+ *	including the "postscript" widget command plus a few utility
+ *	procedures used for generating Postscript.
+ *
+ * Copyright (c) 1991-1994 The Regents of the University of California.
+ * Copyright (c) 1994-1996 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tkCanvPs.c 1.57 97/10/28 18:08:39
+ */
+
+#include "tkInt.h"
+#include "tkCanvas.h"
+#include "tkPort.h"
+
+/*
+ * See tkCanvas.h for key data structures used to implement canvases.
+ */
+
+/*
+ * One of the following structures is created to keep track of Postscript
+ * output being generated.  It consists mostly of information provided on
+ * the widget command line.
+ */
+
+typedef struct TkPostscriptInfo {
+    int x, y, width, height;	/* Area to print, in canvas pixel
+				 * coordinates. */
+    int x2, y2;			/* x+width and y+height. */
+    char *pageXString;		/* String value of "-pagex" option or NULL. */
+    char *pageYString;		/* String value of "-pagey" option or NULL. */
+    double pageX, pageY;	/* Postscript coordinates (in points)
+				 * corresponding to pageXString and
+				 * pageYString. Don't forget that y-values
+				 * grow upwards for Postscript! */
+    char *pageWidthString;	/* Printed width of output. */
+    char *pageHeightString;	/* Printed height of output. */
+    double scale;		/* Scale factor for conversion: each pixel
+				 * maps into this many points. */
+    Tk_Anchor pageAnchor;	/* How to anchor bbox on Postscript page. */
+    int rotate;			/* Non-zero means output should be rotated
+				 * on page (landscape mode). */
+    char *fontVar;		/* If non-NULL, gives name of global variable
+				 * containing font mapping information.
+				 * Malloc'ed. */
+    char *colorVar;		/* If non-NULL, give name of global variable
+				 * containing color mapping information.
+				 * Malloc'ed. */
+    char *colorMode;		/* Mode for handling colors:  "monochrome",
+				 * "gray", or "color".  Malloc'ed. */
+    int colorLevel;		/* Numeric value corresponding to colorMode:
+				 * 0 for mono, 1 for gray, 2 for color. */
+    char *fileName;		/* Name of file in which to write Postscript;
+				 * NULL means return Postscript info as
+				 * result. Malloc'ed. */
+    char *channelName;		/* If -channel is specified, the name of
+                                 * the channel to use. */
+    Tcl_Channel chan;		/* Open channel corresponding to fileName. */
+    Tcl_HashTable fontTable;	/* Hash table containing names of all font
+				 * families used in output.  The hash table
+				 * values are not used. */
+    int prepass;		/* Non-zero means that we're currently in
+				 * the pre-pass that collects font information,
+				 * so the Postscript generated isn't
+				 * relevant. */
+} TkPostscriptInfo;
+
+/*
+ * The table below provides a template that's used to process arguments
+ * to the canvas "postscript" command and fill in TkPostscriptInfo
+ * structures.
+ */
+
+static Tk_ConfigSpec configSpecs[] = {
+    {TK_CONFIG_STRING, "-colormap", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, colorVar), 0},
+    {TK_CONFIG_STRING, "-colormode", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, colorMode), 0},
+    {TK_CONFIG_STRING, "-file", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, fileName), 0},
+    {TK_CONFIG_STRING, "-channel", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, channelName), 0},
+    {TK_CONFIG_STRING, "-fontmap", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, fontVar), 0},
+    {TK_CONFIG_PIXELS, "-height", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, height), 0},
+    {TK_CONFIG_ANCHOR, "-pageanchor", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, pageAnchor), 0},
+    {TK_CONFIG_STRING, "-pageheight", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, pageHeightString), 0},
+    {TK_CONFIG_STRING, "-pagewidth", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, pageWidthString), 0},
+    {TK_CONFIG_STRING, "-pagex", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, pageXString), 0},
+    {TK_CONFIG_STRING, "-pagey", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, pageYString), 0},
+    {TK_CONFIG_BOOLEAN, "-rotate", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, rotate), 0},
+    {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, width), 0},
+    {TK_CONFIG_PIXELS, "-x", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, x), 0},
+    {TK_CONFIG_PIXELS, "-y", (char *) NULL, (char *) NULL,
+	"", Tk_Offset(TkPostscriptInfo, y), 0},
+    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
+	(char *) NULL, 0, 0}
+};
+
+/*
+ * Forward declarations for procedures defined later in this file:
+ */
+
+static int		GetPostscriptPoints _ANSI_ARGS_((Tcl_Interp *interp,
+			    char *string, double *doublePtr));
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TkCanvPostscriptCmd --
+ *
+ *	This procedure is invoked to process the "postscript" options
+ *	of the widget command for canvas widgets. See the user
+ *	documentation for details on what it does.
+ *
+ * Results:
+ *	A standard Tcl result.
+ *
+ * Side effects:
+ *	See the user documentation.
+ *
+ *--------------------------------------------------------------
+ */
+
+    /* ARGSUSED */
+int
+TkCanvPostscriptCmd(canvasPtr, interp, argc, argv)
+    TkCanvas *canvasPtr;		/* Information about canvas widget. */
+    Tcl_Interp *interp;			/* Current interpreter. */
+    int argc;				/* Number of arguments. */
+    char **argv;			/* Argument strings.  Caller has
+					 * already parsed this command enough
+					 * to know that argv[1] is
+					 * "postscript". */
+{
+    TkPostscriptInfo psInfo, *oldInfoPtr;
+    int result;
+    Tk_Item *itemPtr;
+#define STRING_LENGTH 400
+    char string[STRING_LENGTH+1], *p;
+    time_t now;
+    size_t length;
+    int deltaX = 0, deltaY = 0;		/* Offset of lower-left corner of
+					 * area to be marked up, measured
+					 * in canvas units from the positioning
+					 * point on the page (reflects
+					 * anchor position).  Initial values
+					 * needed only to stop compiler
+					 * warnings. */
+    Tcl_HashSearch search;
+    Tcl_HashEntry *hPtr;
+    Tcl_DString buffer;
+
+    /*
+     *----------------------------------------------------------------
+     * Initialize the data structure describing Postscript generation,
+     * then process all the arguments to fill the data structure in.
+     *----------------------------------------------------------------
+     */
+
+    oldInfoPtr = canvasPtr->psInfoPtr;
+    canvasPtr->psInfoPtr = &psInfo;
+    psInfo.x = canvasPtr->xOrigin;
+    psInfo.y = canvasPtr->yOrigin;
+    psInfo.width = -1;
+    psInfo.height = -1;
+    psInfo.pageXString = NULL;
+    psInfo.pageYString = NULL;
+    psInfo.pageX = 72*4.25;
+    psInfo.pageY = 72*5.5;
+    psInfo.pageWidthString = NULL;
+    psInfo.pageHeightString = NULL;
+    psInfo.scale = 1.0;
+    psInfo.pageAnchor = TK_ANCHOR_CENTER;
+    psInfo.rotate = 0;
+    psInfo.fontVar = NULL;
+    psInfo.colorVar = NULL;
+    psInfo.colorMode = NULL;
+    psInfo.colorLevel = 0;
+    psInfo.fileName = NULL;
+    psInfo.channelName = NULL;
+    psInfo.chan = NULL;
+    psInfo.prepass = 0;
+    Tcl_InitHashTable(&psInfo.fontTable, TCL_STRING_KEYS);
+    result = Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin,
+	    configSpecs, argc-2, argv+2, (char *) &psInfo,
+	    TK_CONFIG_ARGV_ONLY);
+    if (result != TCL_OK) {
+	goto cleanup;
+    }
+
+    if (psInfo.width == -1) {
+	psInfo.width = Tk_Width(canvasPtr->tkwin);
+    }
+    if (psInfo.height == -1) {
+	psInfo.height = Tk_Height(canvasPtr->tkwin);
+    }
+    psInfo.x2 = psInfo.x + psInfo.width;
+    psInfo.y2 = psInfo.y + psInfo.height;
+
+    if (psInfo.pageXString != NULL) {
+	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageXString,
+		&psInfo.pageX) != TCL_OK) {
+	    goto cleanup;
+	}
+    }
+    if (psInfo.pageYString != NULL) {
+	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageYString,
+		&psInfo.pageY) != TCL_OK) {
+	    goto cleanup;
+	}
+    }
+    if (psInfo.pageWidthString != NULL) {
+	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageWidthString,
+		&psInfo.scale) != TCL_OK) {
+	    goto cleanup;
+	}
+	psInfo.scale /= psInfo.width;
+    } else if (psInfo.pageHeightString != NULL) {
+	if (GetPostscriptPoints(canvasPtr->interp, psInfo.pageHeightString,
+		&psInfo.scale) != TCL_OK) {
+	    goto cleanup;
+	}
+	psInfo.scale /= psInfo.height;
+    } else {
+	psInfo.scale = (72.0/25.4)*WidthMMOfScreen(Tk_Screen(canvasPtr->tkwin));
+	psInfo.scale /= WidthOfScreen(Tk_Screen(canvasPtr->tkwin));
+    }
+    switch (psInfo.pageAnchor) {
+	case TK_ANCHOR_NW:
+	case TK_ANCHOR_W:
+	case TK_ANCHOR_SW:
+	    deltaX = 0;
+	    break;
+	case TK_ANCHOR_N:
+	case TK_ANCHOR_CENTER:
+	case TK_ANCHOR_S:
+	    deltaX = -psInfo.width/2;
+	    break;
+	case TK_ANCHOR_NE:
+	case TK_ANCHOR_E:
+	case TK_ANCHOR_SE:
+	    deltaX = -psInfo.width;
+	    break;
+    }
+    switch (psInfo.pageAnchor) {
+	case TK_ANCHOR_NW:
+	case TK_ANCHOR_N:
+	case TK_ANCHOR_NE:
+	    deltaY = - psInfo.height;
+	    break;
+	case TK_ANCHOR_W:
+	case TK_ANCHOR_CENTER:
+	case TK_ANCHOR_E:
+	    deltaY = -psInfo.height/2;
+	    break;
+	case TK_ANCHOR_SW:
+	case TK_ANCHOR_S:
+	case TK_ANCHOR_SE:
+	    deltaY = 0;
+	    break;
+    }
+
+    if (psInfo.colorMode == NULL) {
+	psInfo.colorLevel = 2;
+    } else {
+	length = strlen(psInfo.colorMode);
+	if (strncmp(psInfo.colorMode, "monochrome", length) == 0) {
+	    psInfo.colorLevel = 0;
+	} else if (strncmp(psInfo.colorMode, "gray", length) == 0) {
+	    psInfo.colorLevel = 1;
+	} else if (strncmp(psInfo.colorMode, "color", length) == 0) {
+	    psInfo.colorLevel = 2;
+	} else {
+	    Tcl_AppendResult(canvasPtr->interp, "bad color mode \"",
+		    psInfo.colorMode, "\": must be monochrome, ",
+		    "gray, or color", (char *) NULL);
+	    goto cleanup;
+	}
+    }
+
+    if (psInfo.fileName != NULL) {
+
+        /*
+         * Check that -file and -channel are not both specified.
+         */
+
+        if (psInfo.channelName != NULL) {
+            Tcl_AppendResult(canvasPtr->interp, "can't specify both -file",
+                    " and -channel", (char *) NULL);
+            result = TCL_ERROR;
+            goto cleanup;
+        }
+
+        /*
+         * Check that we are not in a safe interpreter. If we are, disallow
+         * the -file specification.
+         */
+
+        if (Tcl_IsSafe(canvasPtr->interp)) {
+            Tcl_AppendResult(canvasPtr->interp, "can't specify -file in a",
+                    " safe interpreter", (char *) NULL);
+            result = TCL_ERROR;
+            goto cleanup;
+        }
+        
+	p = Tcl_TranslateFileName(canvasPtr->interp, psInfo.fileName, &buffer);
+	if (p == NULL) {
+	    goto cleanup;
+	}
+	psInfo.chan = Tcl_OpenFileChannel(canvasPtr->interp, p, "w", 0666);
+	Tcl_DStringFree(&buffer);
+	if (psInfo.chan == NULL) {
+	    goto cleanup;
+	}
+    }
+
+    if (psInfo.channelName != NULL) {
+        int mode;
+        
+        /*
+         * Check that the channel is found in this interpreter and that it
+         * is open for writing.
+         */
+
+        psInfo.chan = Tcl_GetChannel(canvasPtr->interp, psInfo.channelName,
+                &mode);
+        if (psInfo.chan == (Tcl_Channel) NULL) {
+            result = TCL_ERROR;
+            goto cleanup;
+        }
+        if ((mode & TCL_WRITABLE) == 0) {
+            Tcl_AppendResult(canvasPtr->interp, "channel \"",
+                    psInfo.channelName, "\" wasn't opened for writing",
+                    (char *) NULL);
+            result = TCL_ERROR;
+            goto cleanup;
+        }
+    }
+    
+    /*
+     *--------------------------------------------------------
+     * Make a pre-pass over all of the items, generating Postscript
+     * and then throwing it away.  The purpose of this pass is just
+     * to collect information about all the fonts in use, so that
+     * we can output font information in the proper form required
+     * by the Document Structuring Conventions.
+     *--------------------------------------------------------
+     */
+
+    psInfo.prepass = 1;
+    for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
+	    itemPtr = itemPtr->nextPtr) {
+	if ((itemPtr->x1 >= psInfo.x2) || (itemPtr->x2 < psInfo.x)
+		|| (itemPtr->y1 >= psInfo.y2) || (itemPtr->y2 < psInfo.y)) {
+	    continue;
+	}
+	if (itemPtr->typePtr->postscriptProc == NULL) {
+	    continue;
+	}
+	result = (*itemPtr->typePtr->postscriptProc)(canvasPtr->interp,
+		(Tk_Canvas) canvasPtr, itemPtr, 1);
+	Tcl_ResetResult(canvasPtr->interp);
+	if (result != TCL_OK) {
+	    /*
+	     * An error just occurred.  Just skip out of this loop.
+	     * There's no need to report the error now;  it can be
+	     * reported later (errors can happen later that don't
+	     * happen now, so we still have to check for errors later
+	     * anyway).
+	     */
+	    break;
+	}
+    }
+    psInfo.prepass = 0;
+
+    /*
+     *--------------------------------------------------------
+     * Generate the header and prolog for the Postscript.
+     *--------------------------------------------------------
+     */
+
+    Tcl_AppendResult(canvasPtr->interp, "%!PS-Adobe-3.0 EPSF-3.0\n",
+	    "%%Creator: Tk Canvas Widget\n", (char *) NULL);
+#if !(defined(__WIN32__) || defined(MAC_TCL))
+    if (!Tcl_IsSafe(interp)) {
+	struct passwd *pwPtr = getpwuid(getuid());
+	Tcl_AppendResult(canvasPtr->interp, "%%For: ",
+		(pwPtr != NULL) ? pwPtr->pw_gecos : "Unknown", "\n",
+		(char *) NULL);
+	endpwent();
+    }
+#endif /* __WIN32__ || MAC_TCL */
+    Tcl_AppendResult(canvasPtr->interp, "%%Title: Window ",
+	    Tk_PathName(canvasPtr->tkwin), "\n", (char *) NULL);
+    time(&now);
+    Tcl_AppendResult(canvasPtr->interp, "%%CreationDate: ",
+	    ctime(&now), (char *) NULL);
+    if (!psInfo.rotate) {
+	sprintf(string, "%d %d %d %d",
+		(int) (psInfo.pageX + psInfo.scale*deltaX),
+		(int) (psInfo.pageY + psInfo.scale*deltaY),
+		(int) (psInfo.pageX + psInfo.scale*(deltaX + psInfo.width)
+			+ 1.0),
+		(int) (psInfo.pageY + psInfo.scale*(deltaY + psInfo.height)
+			+ 1.0));
+    } else {
+	sprintf(string, "%d %d %d %d",
+		(int) (psInfo.pageX - psInfo.scale*(deltaY + psInfo.height)),
+		(int) (psInfo.pageY + psInfo.scale*deltaX),
+		(int) (psInfo.pageX - psInfo.scale*deltaY + 1.0),
+		(int) (psInfo.pageY + psInfo.scale*(deltaX + psInfo.width)
+			+ 1.0));
+    }
+    Tcl_AppendResult(canvasPtr->interp, "%%BoundingBox: ", string,
+	    "\n", (char *) NULL);
+    Tcl_AppendResult(canvasPtr->interp, "%%Pages: 1\n", 
+	    "%%DocumentData: Clean7Bit\n", (char *) NULL);
+    Tcl_AppendResult(canvasPtr->interp, "%%Orientation: ",
+	    psInfo.rotate ? "Landscape\n" : "Portrait\n", (char *) NULL);
+    p = "%%DocumentNeededResources: font ";
+    for (hPtr = Tcl_FirstHashEntry(&psInfo.fontTable, &search);
+	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
+	Tcl_AppendResult(canvasPtr->interp, p,
+		Tcl_GetHashKey(&psInfo.fontTable, hPtr),
+		"\n", (char *) NULL);
+	p = "%%+ font ";
+    }
+    Tcl_AppendResult(canvasPtr->interp, "%%EndComments\n\n", (char *) NULL);
+
+    /*
+     * Read a standard prolog file in a native way and insert it into
+     * the Postscript.
+     */
+
+    if (TkGetNativeProlog(canvasPtr->interp) != TCL_OK) {
+	result = TCL_ERROR;
+	goto cleanup;
+    }
+    if (psInfo.chan != NULL) {
+	Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
+	Tcl_ResetResult(canvasPtr->interp);
+    }
+
+    /*
+     *-----------------------------------------------------------
+     * Document setup:  set the color level and include fonts.
+     *-----------------------------------------------------------
+     */
+
+    sprintf(string, "/CL %d def\n", psInfo.colorLevel);
+    Tcl_AppendResult(canvasPtr->interp, "%%BeginSetup\n", string,
+	    (char *) NULL);
+    for (hPtr = Tcl_FirstHashEntry(&psInfo.fontTable, &search);
+	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
+	Tcl_AppendResult(canvasPtr->interp, "%%IncludeResource: font ",
+		Tcl_GetHashKey(&psInfo.fontTable, hPtr), "\n", (char *) NULL);
+    }
+    Tcl_AppendResult(canvasPtr->interp, "%%EndSetup\n\n", (char *) NULL);
+
+    /*
+     *-----------------------------------------------------------
+     * Page setup:  move to page positioning point, rotate if
+     * needed, set scale factor, offset for proper anchor position,
+     * and set clip region.
+     *-----------------------------------------------------------
+     */
+
+    Tcl_AppendResult(canvasPtr->interp, "%%Page: 1 1\n", "save\n",
+	    (char *) NULL);
+    sprintf(string, "%.1f %.1f translate\n", psInfo.pageX, psInfo.pageY);
+    Tcl_AppendResult(canvasPtr->interp, string, (char *) NULL);
+    if (psInfo.rotate) {
+	Tcl_AppendResult(canvasPtr->interp, "90 rotate\n", (char *) NULL);
+    }
+    sprintf(string, "%.4g %.4g scale\n", psInfo.scale, psInfo.scale);
+    Tcl_AppendResult(canvasPtr->interp, string, (char *) NULL);
+    sprintf(string, "%d %d translate\n", deltaX - psInfo.x, deltaY);
+    Tcl_AppendResult(canvasPtr->interp, string, (char *) NULL);
+    sprintf(string, "%d %.15g moveto %d %.15g lineto %d %.15g lineto %d %.15g",
+	    psInfo.x, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y),
+	    psInfo.x2, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y),
+	    psInfo.x2, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y2),
+	    psInfo.x, Tk_CanvasPsY((Tk_Canvas) canvasPtr, (double) psInfo.y2));
+    Tcl_AppendResult(canvasPtr->interp, string,
+	" lineto closepath clip newpath\n", (char *) NULL);
+    if (psInfo.chan != NULL) {
+	Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
+	Tcl_ResetResult(canvasPtr->interp);
+    }
+
+    /*
+     *---------------------------------------------------------------------
+     * Iterate through all the items, having each relevant one draw itself.
+     * Quit if any of the items returns an error.
+     *---------------------------------------------------------------------
+     */
+
+    result = TCL_OK;
+    for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
+	    itemPtr = itemPtr->nextPtr) {
+	if ((itemPtr->x1 >= psInfo.x2) || (itemPtr->x2 < psInfo.x)
+		|| (itemPtr->y1 >= psInfo.y2) || (itemPtr->y2 < psInfo.y)) {
+	    continue;
+	}
+	if (itemPtr->typePtr->postscriptProc == NULL) {
+	    continue;
+	}
+	Tcl_AppendResult(canvasPtr->interp, "gsave\n", (char *) NULL);
+	result = (*itemPtr->typePtr->postscriptProc)(canvasPtr->interp,
+		(Tk_Canvas) canvasPtr, itemPtr, 0);
+	if (result != TCL_OK) {
+	    char msg[100];
+
+	    sprintf(msg, "\n    (generating Postscript for item %d)",
+		    itemPtr->id);
+	    Tcl_AddErrorInfo(canvasPtr->interp, msg);
+	    goto cleanup;
+	}
+	Tcl_AppendResult(canvasPtr->interp, "grestore\n", (char *) NULL);
+	if (psInfo.chan != NULL) {
+	    Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
+	    Tcl_ResetResult(canvasPtr->interp);
+	}
+    }
+
+    /*
+     *---------------------------------------------------------------------
+     * Output page-end information, such as commands to print the page
+     * and document trailer stuff.
+     *---------------------------------------------------------------------
+     */
+
+    Tcl_AppendResult(canvasPtr->interp, "restore showpage\n\n",
+	    "%%Trailer\nend\n%%EOF\n", (char *) NULL);
+    if (psInfo.chan != NULL) {
+	Tcl_Write(psInfo.chan, canvasPtr->interp->result, -1);
+	Tcl_ResetResult(canvasPtr->interp);
+    }
+
+    /*
+     * Clean up psInfo to release malloc'ed stuff.
+     */
+
+    cleanup:
+    if (psInfo.pageXString != NULL) {
+	ckfree(psInfo.pageXString);
+    }
+    if (psInfo.pageYString != NULL) {
+	ckfree(psInfo.pageYString);
+    }
+    if (psInfo.pageWidthString != NULL) {
+	ckfree(psInfo.pageWidthString);
+    }
+    if (psInfo.pageHeightString != NULL) {
+	ckfree(psInfo.pageHeightString);
+    }
+    if (psInfo.fontVar != NULL) {
+	ckfree(psInfo.fontVar);
+    }
+    if (psInfo.colorVar != NULL) {
+	ckfree(psInfo.colorVar);
+    }
+    if (psInfo.colorMode != NULL) {
+	ckfree(psInfo.colorMode);
+    }
+    if (psInfo.fileName != NULL) {
+	ckfree(psInfo.fileName);
+    }
+    if ((psInfo.chan != NULL) && (psInfo.channelName == NULL)) {
+	Tcl_Close(canvasPtr->interp, psInfo.chan);
+    }
+    if (psInfo.channelName != NULL) {
+        ckfree(psInfo.channelName);
+    }
+    Tcl_DeleteHashTable(&psInfo.fontTable);
+    canvasPtr->psInfoPtr = oldInfoPtr;
+    return result;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_CanvasPsColor --
+ *
+ *	This procedure is called by individual canvas items when
+ *	they want to set a color value for output.  Given information
+ *	about an X color, this procedure will generate Postscript
+ *	commands to set up an appropriate color in Postscript.
+ *
+ * Results:
+ *	Returns a standard Tcl return value.  If an error occurs
+ *	then an error message will be left in interp->result.
+ *	If no error occurs, then additional Postscript will be
+ *	appended to interp->result.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+int
+Tk_CanvasPsColor(interp, canvas, colorPtr)
+    Tcl_Interp *interp;			/* Interpreter for returning Postscript
+					 * or error message. */
+    Tk_Canvas canvas;			/* Information about canvas. */
+    XColor *colorPtr;			/* Information about color. */
+{
+    TkCanvas *canvasPtr = (TkCanvas *) canvas;
+    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
+    int tmp;
+    double red, green, blue;
+    char string[200];
+
+    if (psInfoPtr->prepass) {
+	return TCL_OK;
+    }
+
+    /*
+     * If there is a color map defined, then look up the color's name
+     * in the map and use the Postscript commands found there, if there
+     * are any.
+     */
+
+    if (psInfoPtr->colorVar != NULL) {
+	char *cmdString;
+
+	cmdString = Tcl_GetVar2(interp, psInfoPtr->colorVar,
+		Tk_NameOfColor(colorPtr), 0);
+	if (cmdString != NULL) {
+	    Tcl_AppendResult(interp, cmdString, "\n", (char *) NULL);
+	    return TCL_OK;
+	}
+    }
+
+    /*
+     * No color map entry for this color.  Grab the color's intensities
+     * and output Postscript commands for them.  Special note:  X uses
+     * a range of 0-65535 for intensities, but most displays only use
+     * a range of 0-255, which maps to (0, 256, 512, ... 65280) in the
+     * X scale.  This means that there's no way to get perfect white,
+     * since the highest intensity is only 65280 out of 65535.  To
+     * work around this problem, rescale the X intensity to a 0-255
+     * scale and use that as the basis for the Postscript colors.  This
+     * scheme still won't work if the display only uses 4 bits per color,
+     * but most diplays use at least 8 bits.
+     */
+
+    tmp = colorPtr->red;
+    red = ((double) (tmp >> 8))/255.0;
+    tmp = colorPtr->green;
+    green = ((double) (tmp >> 8))/255.0;
+    tmp = colorPtr->blue;
+    blue = ((double) (tmp >> 8))/255.0;
+    sprintf(string, "%.3f %.3f %.3f setrgbcolor AdjustColor\n",
+	    red, green, blue);
+    Tcl_AppendResult(interp, string, (char *) NULL);
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_CanvasPsFont --
+ *
+ *	This procedure is called by individual canvas items when
+ *	they want to output text.  Given information about an X
+ *	font, this procedure will generate Postscript commands
+ *	to set up an appropriate font in Postscript.
+ *
+ * Results:
+ *	Returns a standard Tcl return value.  If an error occurs
+ *	then an error message will be left in interp->result.
+ *	If no error occurs, then additional Postscript will be
+ *	appended to the interp->result.
+ *
+ * Side effects:
+ *	The Postscript font name is entered into psInfoPtr->fontTable
+ *	if it wasn't already there.
+ *
+ *--------------------------------------------------------------
+ */
+
+int
+Tk_CanvasPsFont(interp, canvas, tkfont)
+    Tcl_Interp *interp;			/* Interpreter for returning Postscript
+					 * or error message. */
+    Tk_Canvas canvas;			/* Information about canvas. */
+    Tk_Font tkfont;			/* Information about font in which text
+					 * is to be printed. */
+{
+    TkCanvas *canvasPtr = (TkCanvas *) canvas;
+    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
+    char *end;
+    char pointString[20];
+    Tcl_DString ds;
+    int i, points;
+
+    /*
+     * First, look up the font's name in the font map, if there is one.
+     * If there is an entry for this font, it consists of a list
+     * containing font name and size.  Use this information.
+     */
+
+    Tcl_DStringInit(&ds);
+    
+    if (psInfoPtr->fontVar != NULL) {
+	char *list, **argv;
+	int argc;
+	double size;
+	char *name;
+
+	name = Tk_NameOfFont(tkfont);
+	list = Tcl_GetVar2(interp, psInfoPtr->fontVar, name, 0);
+	if (list != NULL) {
+	    if (Tcl_SplitList(interp, list, &argc, &argv) != TCL_OK) {
+		badMapEntry:
+		Tcl_ResetResult(interp);
+		Tcl_AppendResult(interp, "bad font map entry for \"", name,
+			"\": \"", list, "\"", (char *) NULL);
+		return TCL_ERROR;
+	    }
+	    if (argc != 2) {
+		goto badMapEntry;
+	    }
+	    size = strtod(argv[1], &end);
+	    if ((size <= 0) || (*end != 0)) {
+		goto badMapEntry;
+	    }
+
+	    Tcl_DStringAppend(&ds, argv[0], -1);
+	    points = (int) size;
+	    
+	    ckfree((char *) argv);
+	    goto findfont;
+	}
+    } 
+
+    points = Tk_PostscriptFontName(tkfont, &ds);
+
+    findfont:
+    sprintf(pointString, "%d", points);
+    Tcl_AppendResult(interp, "/", Tcl_DStringValue(&ds), " findfont ",
+	    pointString, " scalefont ", (char *) NULL);
+    if (strncasecmp(Tcl_DStringValue(&ds), "Symbol", 7) != 0) {
+	Tcl_AppendResult(interp, "ISOEncode ", (char *) NULL);
+    }
+    Tcl_AppendResult(interp, "setfont\n", (char *) NULL);
+    Tcl_CreateHashEntry(&psInfoPtr->fontTable, Tcl_DStringValue(&ds), &i);
+    Tcl_DStringFree(&ds);
+
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_CanvasPsBitmap --
+ *
+ *	This procedure is called to output the contents of a
+ *	sub-region of a bitmap in proper image data format for
+ *	Postscript (i.e. data between angle brackets, one bit
+ *	per pixel).
+ *
+ * Results:
+ *	Returns a standard Tcl return value.  If an error occurs
+ *	then an error message will be left in interp->result.
+ *	If no error occurs, then additional Postscript will be
+ *	appended to interp->result.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+int
+Tk_CanvasPsBitmap(interp, canvas, bitmap, startX, startY, width, height)
+    Tcl_Interp *interp;			/* Interpreter for returning Postscript
+					 * or error message. */
+    Tk_Canvas canvas;			/* Information about canvas. */
+    Pixmap bitmap;			/* Bitmap for which to generate
+					 * Postscript. */
+    int startX, startY;			/* Coordinates of upper-left corner
+					 * of rectangular region to output. */
+    int width, height;			/* Height of rectangular region. */
+{
+    TkCanvas *canvasPtr = (TkCanvas *) canvas;
+    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
+    XImage *imagePtr;
+    int charsInLine, x, y, lastX, lastY, value, mask;
+    unsigned int totalWidth, totalHeight;
+    char string[100];
+    Window dummyRoot;
+    int dummyX, dummyY;
+    unsigned dummyBorderwidth, dummyDepth;
+
+    if (psInfoPtr->prepass) {
+	return TCL_OK;
+    }
+
+    /*
+     * The following call should probably be a call to Tk_SizeOfBitmap
+     * instead, but it seems that we are occasionally invoked by custom
+     * item types that create their own bitmaps without registering them
+     * with Tk.  XGetGeometry is a bit slower than Tk_SizeOfBitmap, but
+     * it shouldn't matter here.
+     */
+
+    XGetGeometry(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap, &dummyRoot,
+	    (int *) &dummyX, (int *) &dummyY, (unsigned int *) &totalWidth,
+	    (unsigned int *) &totalHeight, &dummyBorderwidth, &dummyDepth);
+    imagePtr = XGetImage(Tk_Display(canvasPtr->tkwin), bitmap, 0, 0,
+	    totalWidth, totalHeight, 1, XYPixmap);
+    Tcl_AppendResult(interp, "<", (char *) NULL);
+    mask = 0x80;
+    value = 0;
+    charsInLine = 0;
+    lastX = startX + width - 1;
+    lastY = startY + height - 1;
+    for (y = lastY; y >= startY; y--) {
+	for (x = startX; x <= lastX; x++) {
+	    if (XGetPixel(imagePtr, x, y)) {
+		value |= mask;
+	    }
+	    mask >>= 1;
+	    if (mask == 0) {
+		sprintf(string, "%02x", value);
+		Tcl_AppendResult(interp, string, (char *) NULL);
+		mask = 0x80;
+		value = 0;
+		charsInLine += 2;
+		if (charsInLine >= 60) {
+		    Tcl_AppendResult(interp, "\n", (char *) NULL);
+		    charsInLine = 0;
+		}
+	    }
+	}
+	if (mask != 0x80) {
+	    sprintf(string, "%02x", value);
+	    Tcl_AppendResult(interp, string, (char *) NULL);
+	    mask = 0x80;
+	    value = 0;
+	    charsInLine += 2;
+	}
+    }
+    Tcl_AppendResult(interp, ">", (char *) NULL);
+    XDestroyImage(imagePtr);
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_CanvasPsStipple --
+ *
+ *	This procedure is called by individual canvas items when
+ *	they have created a path that they'd like to be filled with
+ *	a stipple pattern.  Given information about an X bitmap,
+ *	this procedure will generate Postscript commands to fill
+ *	the current clip region using a stipple pattern defined by the
+ *	bitmap.
+ *
+ * Results:
+ *	Returns a standard Tcl return value.  If an error occurs
+ *	then an error message will be left in interp->result.
+ *	If no error occurs, then additional Postscript will be
+ *	appended to interp->result.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+int
+Tk_CanvasPsStipple(interp, canvas, bitmap)
+    Tcl_Interp *interp;			/* Interpreter for returning Postscript
+					 * or error message. */
+    Tk_Canvas canvas;			/* Information about canvas. */
+    Pixmap bitmap;			/* Bitmap to use for stippling. */
+{
+    TkCanvas *canvasPtr = (TkCanvas *) canvas;
+    TkPostscriptInfo *psInfoPtr = canvasPtr->psInfoPtr;
+    int width, height;
+    char string[100];
+    Window dummyRoot;
+    int dummyX, dummyY;
+    unsigned dummyBorderwidth, dummyDepth;
+
+    if (psInfoPtr->prepass) {
+	return TCL_OK;
+    }
+
+    /*
+     * The following call should probably be a call to Tk_SizeOfBitmap
+     * instead, but it seems that we are occasionally invoked by custom
+     * item types that create their own bitmaps without registering them
+     * with Tk.  XGetGeometry is a bit slower than Tk_SizeOfBitmap, but
+     * it shouldn't matter here.
+     */
+
+    XGetGeometry(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap, &dummyRoot,
+	    (int *) &dummyX, (int *) &dummyY, (unsigned *) &width,
+	    (unsigned *) &height, &dummyBorderwidth, &dummyDepth);
+    sprintf(string, "%d %d ", width, height);
+    Tcl_AppendResult(interp, string, (char *) NULL);
+    if (Tk_CanvasPsBitmap(interp, (Tk_Canvas) canvasPtr, bitmap, 0, 0,
+	    width, height) != TCL_OK) {
+	return TCL_ERROR;
+    }
+    Tcl_AppendResult(interp, " StippleFill\n", (char *) NULL);
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_CanvasPsY --
+ *
+ *	Given a y-coordinate in canvas coordinates, this procedure
+ *	returns a y-coordinate to use for Postscript output.
+ *
+ * Results:
+ *	Returns the Postscript coordinate that corresponds to
+ *	"y".
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+double
+Tk_CanvasPsY(canvas, y)
+    Tk_Canvas canvas;			/* Token for canvas on whose behalf
+					 * Postscript is being generated. */
+    double y;				/* Y-coordinate in canvas coords. */
+{
+    TkPostscriptInfo *psInfoPtr = ((TkCanvas *) canvas)->psInfoPtr;
+
+    return psInfoPtr->y2 - y;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_CanvasPsPath --
+ *
+ *	Given an array of points for a path, generate Postscript
+ *	commands to create the path.
+ *
+ * Results:
+ *	Postscript commands get appended to what's in interp->result.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+void
+Tk_CanvasPsPath(interp, canvas, coordPtr, numPoints)
+    Tcl_Interp *interp;			/* Put generated Postscript in this
+					 * interpreter's result field. */
+    Tk_Canvas canvas;			/* Canvas on whose behalf Postscript
+					 * is being generated. */
+    double *coordPtr;			/* Pointer to first in array of
+					 * 2*numPoints coordinates giving
+					 * points for path. */
+    int numPoints;			/* Number of points at *coordPtr. */
+{
+    TkPostscriptInfo *psInfoPtr = ((TkCanvas *) canvas)->psInfoPtr;
+    char buffer[200];
+
+    if (psInfoPtr->prepass) {
+	return;
+    }
+    sprintf(buffer, "%.15g %.15g moveto\n", coordPtr[0],
+	    Tk_CanvasPsY(canvas, coordPtr[1]));
+    Tcl_AppendResult(interp, buffer, (char *) NULL);
+    for (numPoints--, coordPtr += 2; numPoints > 0;
+	    numPoints--, coordPtr += 2) {
+	sprintf(buffer, "%.15g %.15g lineto\n", coordPtr[0],
+		Tk_CanvasPsY(canvas, coordPtr[1]));
+	Tcl_AppendResult(interp, buffer, (char *) NULL);
+    }
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * GetPostscriptPoints --
+ *
+ *	Given a string, returns the number of Postscript points
+ *	corresponding to that string.
+ *
+ * Results:
+ *	The return value is a standard Tcl return result.  If
+ *	TCL_OK is returned, then everything went well and the
+ *	screen distance is stored at *doublePtr;  otherwise
+ *	TCL_ERROR is returned and an error message is left in
+ *	interp->result.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+GetPostscriptPoints(interp, string, doublePtr)
+    Tcl_Interp *interp;		/* Use this for error reporting. */
+    char *string;		/* String describing a screen distance. */
+    double *doublePtr;		/* Place to store converted result. */
+{
+    char *end;
+    double d;
+
+    d = strtod(string, &end);
+    if (end == string) {
+	error:
+	Tcl_AppendResult(interp, "bad distance \"", string,
+		"\"", (char *) NULL);
+	return TCL_ERROR;
+    }
+    while ((*end != '\0') && isspace(UCHAR(*end))) {
+	end++;
+    }
+    switch (*end) {
+	case 'c':
+	    d *= 72.0/2.54;
+	    end++;
+	    break;
+	case 'i':
+	    d *= 72.0;
+	    end++;
+	    break;
+	case 'm':
+	    d *= 72.0/25.4;
+	    end++;
+	    break;
+	case 0:
+	    break;
+	case 'p':
+	    end++;
+	    break;
+	default:
+	    goto error;
+    }
+    while ((*end != '\0') && isspace(UCHAR(*end))) {
+	end++;
+    }
+    if (*end != 0) {
+	goto error;
+    }
+    *doublePtr = d;
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TkGetProlog --
+ *
+ *	Locate and load the postscript prolog.
+ *
+ * Results:
+ *	A standard Tcl Result.  If everything is OK the prolog
+ *	will be located in the result string of the interpreter.
+ *
+ * Side effects:
+ *	None.
+ *
+ *--------------------------------------------------------------
+ */
+
+int
+TkGetProlog(interp)
+    Tcl_Interp *interp;		/* Places the prolog in the result. */
+{
+    char *libDir;
+    Tcl_Channel chan;
+    Tcl_DString buffer, buffer2;
+    char *prologPathParts[2];
+    int bufferSize;
+    char *prologBuffer;
+
+    libDir = Tcl_GetVar(interp, "tk_library", TCL_GLOBAL_ONLY);
+    if (libDir == NULL) {
+	Tcl_ResetResult(interp);
+	Tcl_AppendResult(interp, "couldn't find library directory: ",
+		"tk_library variable doesn't exist", (char *) NULL);
+	return TCL_ERROR;
+    }
+    Tcl_TranslateFileName(interp, libDir, &buffer);
+    prologPathParts[0] = buffer.string;
+    prologPathParts[1] = "prolog.ps";
+    Tcl_DStringInit(&buffer2);
+    Tcl_JoinPath(2, prologPathParts, &buffer2);
+    Tcl_DStringFree(&buffer);
+
+    /*
+     * Compute size of file by seeking to the end of the file.  This will
+     * overallocate if we are performing CRLF translation.
+     */
+    
+    chan = Tcl_OpenFileChannel(NULL, buffer2.string, "r", 0);
+    if (chan == NULL) {
+	/*
+	 * We have to set the error message ourselves because the
+	 * interp's result need to be reset.
+	 */
+	Tcl_ResetResult(interp);
+	Tcl_AppendResult(interp, "couldn't open \"", 
+		buffer2.string, "\": ", Tcl_PosixError(interp), (char *) NULL);
+	Tcl_DStringFree(&buffer2);
+	return TCL_ERROR;
+    }
+
+    bufferSize = Tcl_Seek(chan, 0L, SEEK_END);
+    (void) Tcl_Seek(chan, 0L, SEEK_SET);
+    if (bufferSize < 0) {
+	Tcl_ResetResult(interp);
+	Tcl_AppendResult(interp, "error seeking to end of file \"",
+		buffer2.string, "\": ", Tcl_PosixError(interp), (char *) NULL);
+	Tcl_Close(NULL, chan);
+	Tcl_DStringFree(&buffer2);
+	return TCL_ERROR;
+
+    }
+    prologBuffer = (char *) ckalloc((unsigned) bufferSize+1);
+    bufferSize = Tcl_Read(chan, prologBuffer, bufferSize);
+    Tcl_Close(NULL, chan);
+    if (bufferSize < 0) {
+	Tcl_ResetResult(interp);
+	Tcl_AppendResult(interp, "error reading file \"", buffer2.string, 
+		"\": ", Tcl_PosixError(interp), (char *) NULL);
+	Tcl_DStringFree(&buffer2);
+	return TCL_ERROR;
+    }
+    Tcl_DStringFree(&buffer2);
+    prologBuffer[bufferSize] = 0;
+    Tcl_AppendResult(interp, prologBuffer, (char *) NULL);
+    ckfree(prologBuffer);
+    
+    return TCL_OK;
+}