/* * 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) 1994-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tkCanvPs.c,v 1.1.1.1 2007/07/10 15:05:17 duncan Exp $ */ #include "tkInt.h" #include "tkCanvas.h" #include "tkPort.h" /* * See tkCanvas.h for key data structures used to implement canvases. */ /* * The following definition is used in generating postscript for images * and windows. */ typedef struct TkColormapData { /* Hold color information for a window */ int separated; /* Whether to use separate color bands */ int color; /* Whether window is color or black/white */ int ncolors; /* Number of color values stored */ XColor *colors; /* Pixel value -> RGB mappings */ int red_mask, green_mask, blue_mask; /* Masks and shifts for each */ int red_shift, green_shift, blue_shift; /* color band */ } TkColormapData; /* * 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. */ int prolog; /* Non-zero means output should contain the file prolog.ps in the header. */ } 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, "-prolog", (char *) NULL, (char *) NULL, "", Tk_Offset(TkPostscriptInfo, prolog), 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. */ CONST char **argv; /* Argument strings. Caller has * already parsed this command enough * to know that argv[1] is * "postscript". */ { TkPostscriptInfo psInfo; Tk_PostscriptInfo oldInfoPtr; int result; Tk_Item *itemPtr; #define STRING_LENGTH 400 char string[STRING_LENGTH+1]; CONST char *p; time_t now; size_t length; Tk_Window tkwin = canvasPtr->tkwin; 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; char psenccmd[]="::tk::ensure_psenc_is_loaded"; /* *---------------------------------------------------------------- * Initialize the data structure describing Postscript generation, * then process all the arguments to fill the data structure in. *---------------------------------------------------------------- */ result = Tcl_EvalEx(interp,psenccmd,-1,TCL_EVAL_GLOBAL); if (result != TCL_OK) { return result; } oldInfoPtr = canvasPtr->psInfo; canvasPtr->psInfo = (Tk_PostscriptInfo) &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; psInfo.prolog = 1; Tcl_InitHashTable(&psInfo.fontTable, TCL_STRING_KEYS); result = Tk_ConfigureWidget(interp, 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(tkwin); } if (psInfo.height == -1) { psInfo.height = Tk_Height(tkwin); } psInfo.x2 = psInfo.x + psInfo.width; psInfo.y2 = psInfo.y + psInfo.height; if (psInfo.pageXString != NULL) { if (GetPostscriptPoints(interp, psInfo.pageXString, &psInfo.pageX) != TCL_OK) { goto cleanup; } } if (psInfo.pageYString != NULL) { if (GetPostscriptPoints(interp, psInfo.pageYString, &psInfo.pageY) != TCL_OK) { goto cleanup; } } if (psInfo.pageWidthString != NULL) { if (GetPostscriptPoints(interp, psInfo.pageWidthString, &psInfo.scale) != TCL_OK) { goto cleanup; } psInfo.scale /= psInfo.width; } else if (psInfo.pageHeightString != NULL) { if (GetPostscriptPoints(interp, psInfo.pageHeightString, &psInfo.scale) != TCL_OK) { goto cleanup; } psInfo.scale /= psInfo.height; } else { psInfo.scale = (72.0/25.4)*WidthMMOfScreen(Tk_Screen(tkwin)); psInfo.scale /= WidthOfScreen(Tk_Screen(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(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(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(interp)) { Tcl_AppendResult(interp, "can't specify -file in a", " safe interpreter", (char *) NULL); result = TCL_ERROR; goto cleanup; } p = Tcl_TranslateFileName(interp, psInfo.fileName, &buffer); if (p == NULL) { goto cleanup; } psInfo.chan = Tcl_OpenFileChannel(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(interp, psInfo.channelName, &mode); if (psInfo.chan == (Tcl_Channel) NULL) { result = TCL_ERROR; goto cleanup; } if ((mode & TCL_WRITABLE) == 0) { Tcl_AppendResult(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)(interp, (Tk_Canvas) canvasPtr, itemPtr, 1); Tcl_ResetResult(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. *-------------------------------------------------------- */ if (psInfo.prolog) { Tcl_AppendResult(interp, "%!PS-Adobe-3.0 EPSF-3.0\n", "%%Creator: Tk Canvas Widget\n", (char *) NULL); #ifdef HAVE_PW_GECOS if (!Tcl_IsSafe(interp)) { struct passwd *pwPtr = getpwuid(getuid()); /* INTL: Native. */ Tcl_AppendResult(interp, "%%For: ", (pwPtr != NULL) ? pwPtr->pw_gecos : "Unknown", "\n", (char *) NULL); endpwent(); } #endif /* HAVE_PW_GECOS */ Tcl_AppendResult(interp, "%%Title: Window ", Tk_PathName(tkwin), "\n", (char *) NULL); time(&now); Tcl_AppendResult(interp, "%%CreationDate: ", ctime(&now), (char *) NULL); /* INTL: Native. */ 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(interp, "%%BoundingBox: ", string, "\n", (char *) NULL); Tcl_AppendResult(interp, "%%Pages: 1\n", "%%DocumentData: Clean7Bit\n", (char *) NULL); Tcl_AppendResult(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(interp, p, Tcl_GetHashKey(&psInfo.fontTable, hPtr), "\n", (char *) NULL); p = "%%+ font "; } Tcl_AppendResult(interp, "%%EndComments\n\n", (char *) NULL); /* * Insert the prolog */ Tcl_AppendResult(interp, Tcl_GetVar(interp,"::tk::ps_preamable", TCL_GLOBAL_ONLY), (char *) NULL); if (psInfo.chan != NULL) { Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -1); Tcl_ResetResult(canvasPtr->interp); } /* *----------------------------------------------------------- * Document setup: set the color level and include fonts. *----------------------------------------------------------- */ sprintf(string, "/CL %d def\n", psInfo.colorLevel); Tcl_AppendResult(interp, "%%BeginSetup\n", string, (char *) NULL); for (hPtr = Tcl_FirstHashEntry(&psInfo.fontTable, &search); hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) { Tcl_AppendResult(interp, "%%IncludeResource: font ", Tcl_GetHashKey(&psInfo.fontTable, hPtr), "\n", (char *) NULL); } Tcl_AppendResult(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(interp, "%%Page: 1 1\n", "save\n", (char *) NULL); sprintf(string, "%.1f %.1f translate\n", psInfo.pageX, psInfo.pageY); Tcl_AppendResult(interp, string, (char *) NULL); if (psInfo.rotate) { Tcl_AppendResult(interp, "90 rotate\n", (char *) NULL); } sprintf(string, "%.4g %.4g scale\n", psInfo.scale, psInfo.scale); Tcl_AppendResult(interp, string, (char *) NULL); sprintf(string, "%d %d translate\n", deltaX - psInfo.x, deltaY); Tcl_AppendResult(interp, string, (char *) NULL); sprintf(string, "%d %.15g moveto %d %.15g lineto %d %.15g lineto %d %.15g", psInfo.x, Tk_PostscriptY((double) psInfo.y, (Tk_PostscriptInfo) &psInfo), psInfo.x2, Tk_PostscriptY((double) psInfo.y, (Tk_PostscriptInfo) &psInfo), psInfo.x2, Tk_PostscriptY((double) psInfo.y2, (Tk_PostscriptInfo) &psInfo), psInfo.x, Tk_PostscriptY((double) psInfo.y2, (Tk_PostscriptInfo) &psInfo)); Tcl_AppendResult(interp, string, " lineto closepath clip newpath\n", (char *) NULL); } if (psInfo.chan != NULL) { Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -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; } if (itemPtr->state == TK_STATE_HIDDEN) { continue; } Tcl_AppendResult(interp, "gsave\n", (char *) NULL); result = (*itemPtr->typePtr->postscriptProc)(interp, (Tk_Canvas) canvasPtr, itemPtr, 0); if (result != TCL_OK) { char msg[64 + TCL_INTEGER_SPACE]; sprintf(msg, "\n (generating Postscript for item %d)", itemPtr->id); Tcl_AddErrorInfo(interp, msg); goto cleanup; } Tcl_AppendResult(interp, "grestore\n", (char *) NULL); if (psInfo.chan != NULL) { Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -1); Tcl_ResetResult(interp); } } /* *--------------------------------------------------------------------- * Output page-end information, such as commands to print the page * and document trailer stuff. *--------------------------------------------------------------------- */ if (psInfo.prolog) { Tcl_AppendResult(interp, "restore showpage\n\n", "%%Trailer\nend\n%%EOF\n", (char *) NULL); } if (psInfo.chan != NULL) { Tcl_Write(psInfo.chan, Tcl_GetStringResult(interp), -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(interp, psInfo.chan); } if (psInfo.channelName != NULL) { ckfree(psInfo.channelName); } Tcl_DeleteHashTable(&psInfo.fontTable); canvasPtr->psInfo = (Tk_PostscriptInfo) oldInfoPtr; return result; } /* *-------------------------------------------------------------- * * Tk_PostscriptColor -- * * 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 the interp's result. * If no error occurs, then additional Postscript will be * appended to the interp's result. * * Side effects: * None. * *-------------------------------------------------------------- */ int Tk_PostscriptColor(interp, psInfo, colorPtr) Tcl_Interp *interp; Tk_PostscriptInfo psInfo; /* Postscript info. */ XColor *colorPtr; /* Information about color. */ { TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo; 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) { CONST 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_PostscriptFont -- * * 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 the interp's result. * If no error occurs, then additional Postscript will be * appended to the interp's result. * * Side effects: * The Postscript font name is entered into psInfoPtr->fontTable * if it wasn't already there. * *-------------------------------------------------------------- */ int Tk_PostscriptFont(interp, psInfo, tkfont) Tcl_Interp *interp; Tk_PostscriptInfo psInfo; /* Postscript Info. */ Tk_Font tkfont; /* Information about font in which text * is to be printed. */ { TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo; char *end; char pointString[TCL_INTEGER_SPACE]; 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) { CONST char *list; int argc; double size; CONST char **argv; CONST 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_PostscriptBitmap -- * * 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 the interp's result. * If no error occurs, then additional Postscript will be * appended to the interp's result. * * Side effects: * None. * *-------------------------------------------------------------- */ int Tk_PostscriptBitmap(interp, tkwin, psInfo, bitmap, startX, startY, width, height) Tcl_Interp *interp; Tk_Window tkwin; Tk_PostscriptInfo psInfo; /* Postscript info. */ 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. */ { TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo; 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(tkwin), bitmap, &dummyRoot, (int *) &dummyX, (int *) &dummyY, (unsigned int *) &totalWidth, (unsigned int *) &totalHeight, &dummyBorderwidth, &dummyDepth); imagePtr = XGetImage(Tk_Display(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_PostscriptStipple -- * * 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 the interp's result. * If no error occurs, then additional Postscript will be * appended to the interp's result. * * Side effects: * None. * *-------------------------------------------------------------- */ int Tk_PostscriptStipple(interp, tkwin, psInfo, bitmap) Tcl_Interp *interp; Tk_Window tkwin; Tk_PostscriptInfo psInfo; /* Interpreter for returning Postscript * or error message. */ Pixmap bitmap; /* Bitmap to use for stippling. */ { TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo; int width, height; char string[TCL_INTEGER_SPACE * 2]; 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(tkwin), 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_PostscriptBitmap(interp, tkwin, psInfo, bitmap, 0, 0, width, height) != TCL_OK) { return TCL_ERROR; } Tcl_AppendResult(interp, " StippleFill\n", (char *) NULL); return TCL_OK; } /* *-------------------------------------------------------------- * * Tk_PostscriptY -- * * Given a y-coordinate in local 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_PostscriptY(y, psInfo) double y; /* Y-coordinate in canvas coords. */ Tk_PostscriptInfo psInfo; /* Postscript info */ { TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo; return psInfoPtr->y2 - y; } /* *-------------------------------------------------------------- * * Tk_PostscriptPath -- * * Given an array of points for a path, generate Postscript * commands to create the path. * * Results: * Postscript commands get appended to what's in the interp's result. * * Side effects: * None. * *-------------------------------------------------------------- */ void Tk_PostscriptPath(interp, psInfo, coordPtr, numPoints) Tcl_Interp *interp; Tk_PostscriptInfo psInfo; /* 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 = (TkPostscriptInfo *) psInfo; char buffer[200]; if (psInfoPtr->prepass) { return; } sprintf(buffer, "%.15g %.15g moveto\n", coordPtr[0], Tk_PostscriptY(coordPtr[1], psInfo)); Tcl_AppendResult(interp, buffer, (char *) NULL); for (numPoints--, coordPtr += 2; numPoints > 0; numPoints--, coordPtr += 2) { sprintf(buffer, "%.15g %.15g lineto\n", coordPtr[0], Tk_PostscriptY(coordPtr[1], psInfo)); 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 * the interp's 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; } /* *-------------------------------------------------------------- * * TkImageGetColor -- * * This procedure converts a pixel value to three floating * point numbers, representing the amount of red, green, and * blue in that pixel on the screen. It makes use of colormap * data passed as an argument, and should work for all Visual * types. * * This implementation is bogus on Windows because the colormap * data is never filled in. Instead all postscript generated * data coming through here is expected to be RGB color data. * To handle lower bit-depth images properly, XQueryColors * must be implemented for Windows. * * Results: * Returns red, green, and blue color values in the range * 0 to 1. There are no error returns. * * Side effects: * None. * *-------------------------------------------------------------- */ #ifdef WIN32 #include /* * We could just define these instead of pulling in windows.h. #define GetRValue(rgb) ((BYTE)(rgb)) #define GetGValue(rgb) ((BYTE)(((WORD)(rgb)) >> 8)) #define GetBValue(rgb) ((BYTE)((rgb)>>16)) */ #else #define GetRValue(rgb) ((rgb & cdata->red_mask) >> cdata->red_shift) #define GetGValue(rgb) ((rgb & cdata->green_mask) >> cdata->green_shift) #define GetBValue(rgb) ((rgb & cdata->blue_mask) >> cdata->blue_shift) #endif #if defined(WIN32) || defined(MAC_OSX_TK) static void TkImageGetColor(cdata, pixel, red, green, blue) TkColormapData *cdata; /* Colormap data */ unsigned long pixel; /* Pixel value to look up */ double *red, *green, *blue; /* Color data to return */ { *red = (double) GetRValue(pixel) / 255.0; *green = (double) GetGValue(pixel) / 255.0; *blue = (double) GetBValue(pixel) / 255.0; } #else static void TkImageGetColor(cdata, pixel, red, green, blue) TkColormapData *cdata; /* Colormap data */ unsigned long pixel; /* Pixel value to look up */ double *red, *green, *blue; /* Color data to return */ { if (cdata->separated) { int r = GetRValue(pixel); int g = GetGValue(pixel); int b = GetBValue(pixel); *red = cdata->colors[r].red / 65535.0; *green = cdata->colors[g].green / 65535.0; *blue = cdata->colors[b].blue / 65535.0; } else { *red = cdata->colors[pixel].red / 65535.0; *green = cdata->colors[pixel].green / 65535.0; *blue = cdata->colors[pixel].blue / 65535.0; } } #endif /* *-------------------------------------------------------------- * * TkPostscriptImage -- * * This procedure is called to output the contents of an * image in Postscript, using a format appropriate for the * current color mode (i.e. one bit per pixel in monochrome, * one byte per pixel in gray, and three bytes per pixel in * color). * * 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 TkPostscriptImage(interp, tkwin, psInfo, ximage, x, y, width, height) Tcl_Interp *interp; Tk_Window tkwin; Tk_PostscriptInfo psInfo; /* postscript info */ XImage *ximage; /* Image to draw */ int x, y; /* First pixel to output */ int width, height; /* Width and height of area */ { TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo; char buffer[256]; int xx, yy, band, maxRows; double red, green, blue; int bytesPerLine=0, maxWidth=0; int level = psInfoPtr->colorLevel; Colormap cmap; int i, ncolors; Visual *visual; TkColormapData cdata; if (psInfoPtr->prepass) { return TCL_OK; } cmap = Tk_Colormap(tkwin); visual = Tk_Visual(tkwin); /* * Obtain information about the colormap, ie the mapping between * pixel values and RGB values. The code below should work * for all Visual types. */ ncolors = visual->map_entries; cdata.colors = (XColor *) ckalloc(sizeof(XColor) * ncolors); cdata.ncolors = ncolors; if (visual->class == DirectColor || visual->class == TrueColor) { cdata.separated = 1; cdata.red_mask = visual->red_mask; cdata.green_mask = visual->green_mask; cdata.blue_mask = visual->blue_mask; cdata.red_shift = 0; cdata.green_shift = 0; cdata.blue_shift = 0; while ((0x0001 & (cdata.red_mask >> cdata.red_shift)) == 0) cdata.red_shift ++; while ((0x0001 & (cdata.green_mask >> cdata.green_shift)) == 0) cdata.green_shift ++; while ((0x0001 & (cdata.blue_mask >> cdata.blue_shift)) == 0) cdata.blue_shift ++; for (i = 0; i < ncolors; i ++) cdata.colors[i].pixel = ((i << cdata.red_shift) & cdata.red_mask) | ((i << cdata.green_shift) & cdata.green_mask) | ((i << cdata.blue_shift) & cdata.blue_mask); } else { cdata.separated=0; for (i = 0; i < ncolors; i ++) cdata.colors[i].pixel = i; } if (visual->class == StaticGray || visual->class == GrayScale) cdata.color = 0; else cdata.color = 1; XQueryColors(Tk_Display(tkwin), cmap, cdata.colors, ncolors); /* * Figure out which color level to use (possibly lower than the * one specified by the user). For example, if the user specifies * color with monochrome screen, use gray or monochrome mode instead. */ if (!cdata.color && level == 2) { level = 1; } if (!cdata.color && cdata.ncolors == 2) { level = 0; } /* * Check that at least one row of the image can be represented * with a string less than 64 KB long (this is a limit in the * Postscript interpreter). */ switch (level) { case 0: bytesPerLine = (width + 7) / 8; maxWidth = 240000; break; case 1: bytesPerLine = width; maxWidth = 60000; break; case 2: bytesPerLine = 3 * width; maxWidth = 20000; break; } if (bytesPerLine > 60000) { Tcl_ResetResult(interp); sprintf(buffer, "Can't generate Postscript for images more than %d pixels wide", maxWidth); Tcl_AppendResult(interp, buffer, (char *) NULL); ckfree((char *) cdata.colors); return TCL_ERROR; } maxRows = 60000 / bytesPerLine; for (band = height-1; band >= 0; band -= maxRows) { int rows = (band >= maxRows) ? maxRows : band + 1; int lineLen = 0; switch (level) { case 0: sprintf(buffer, "%d %d 1 matrix {\n<", width, rows); Tcl_AppendResult(interp, buffer, (char *) NULL); break; case 1: sprintf(buffer, "%d %d 8 matrix {\n<", width, rows); Tcl_AppendResult(interp, buffer, (char *) NULL); break; case 2: sprintf(buffer, "%d %d 8 matrix {\n<", width, rows); Tcl_AppendResult(interp, buffer, (char *) NULL); break; } for (yy = band; yy > band - rows; yy--) { switch (level) { case 0: { /* * Generate data for image in monochrome mode. * No attempt at dithering is made--instead, just * set a threshold. */ unsigned char mask=0x80; unsigned char data=0x00; for (xx = x; xx< x+width; xx++) { TkImageGetColor(&cdata, XGetPixel(ximage, xx, yy), &red, &green, &blue); if (0.30 * red + 0.59 * green + 0.11 * blue > 0.5) data |= mask; mask >>= 1; if (mask == 0) { sprintf(buffer, "%02X", data); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 2; if (lineLen > 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } mask=0x80; data=0x00; } } if ((width % 8) != 0) { sprintf(buffer, "%02X", data); Tcl_AppendResult(interp, buffer, (char *) NULL); mask=0x80; data=0x00; } break; } case 1: { /* * Generate data in gray mode--in this case, take a * weighted sum of the red, green, and blue values. */ for (xx = x; xx < x+width; xx ++) { TkImageGetColor(&cdata, XGetPixel(ximage, xx, yy), &red, &green, &blue); sprintf(buffer, "%02X", (int) floor(0.5 + 255.0 * (0.30 * red + 0.59 * green + 0.11 * blue))); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 2; if (lineLen > 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } } break; } case 2: { /* * Finally, color mode. Here, just output the red, green, * and blue values directly. */ for (xx = x; xx < x+width; xx++) { TkImageGetColor(&cdata, XGetPixel(ximage, xx, yy), &red, &green, &blue); sprintf(buffer, "%02X%02X%02X", (int) floor(0.5 + 255.0 * red), (int) floor(0.5 + 255.0 * green), (int) floor(0.5 + 255.0 * blue)); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 6; if (lineLen > 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } } break; } } } switch (level) { case 0: sprintf(buffer, ">\n} image\n"); break; case 1: sprintf(buffer, ">\n} image\n"); break; case 2: sprintf(buffer, ">\n} false 3 colorimage\n"); break; } Tcl_AppendResult(interp, buffer, (char *) NULL); sprintf(buffer, "0 %d translate\n", rows); Tcl_AppendResult(interp, buffer, (char *) NULL); } ckfree((char *) cdata.colors); return TCL_OK; } /* *-------------------------------------------------------------- * * Tk_PostscriptPhoto -- * * This procedure is called to output the contents of a * photo image in Postscript, using a format appropriate for * the requested postscript color mode (i.e. one byte per pixel * in gray, and three bytes per pixel in color). * * 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 interpreter's result. * * Side effects: * None. * *-------------------------------------------------------------- */ int Tk_PostscriptPhoto(interp, blockPtr, psInfo, width, height) Tcl_Interp *interp; Tk_PhotoImageBlock *blockPtr; Tk_PostscriptInfo psInfo; int width, height; { TkPostscriptInfo *psInfoPtr = (TkPostscriptInfo *) psInfo; int colorLevel = psInfoPtr->colorLevel; static int codeIncluded = 0; unsigned char *pixelPtr; char buffer[256], cspace[40], decode[40]; int bpc; int xx, yy, lineLen; float red, green, blue; int alpha; int bytesPerLine=0, maxWidth=0; unsigned char opaque = 255; unsigned char *alphaPtr; int alphaOffset, alphaPitch, alphaIncr; if (psInfoPtr->prepass) { codeIncluded = 0; return TCL_OK; } /* * Define the "TkPhoto" function, which is a modified version * of the original "transparentimage" function posted * by ian@five-d.com (Ian Kemmish) to comp.lang.postscript. * For a monochrome colorLevel this is a slightly different * version that uses the imagemask command instead of image. */ if( !codeIncluded && (colorLevel != 0) ) { /* * Color and gray-scale code. */ codeIncluded = !0; Tcl_AppendResult( interp, "/TkPhoto { \n", " gsave \n", " 32 dict begin \n", " /tinteger exch def \n", " /transparent 1 string def \n", " transparent 0 tinteger put \n", " /olddict exch def \n", " olddict /DataSource get dup type /filetype ne { \n", " olddict /DataSource 3 -1 roll \n", " 0 () /SubFileDecode filter put \n", " } { \n", " pop \n", " } ifelse \n", " /newdict olddict maxlength dict def \n", " olddict newdict copy pop \n", " /w newdict /Width get def \n", " /crpp newdict /Decode get length 2 idiv def \n", " /str w string def \n", " /pix w crpp mul string def \n", " /substrlen 2 w log 2 log div floor exp cvi def \n", " /substrs [ \n", " { \n", " substrlen string \n", " 0 1 substrlen 1 sub { \n", " 1 index exch tinteger put \n", " } for \n", " /substrlen substrlen 2 idiv def \n", " substrlen 0 eq {exit} if \n", " } loop \n", " ] def \n", " /h newdict /Height get def \n", " 1 w div 1 h div matrix scale \n", " olddict /ImageMatrix get exch matrix concatmatrix \n", " matrix invertmatrix concat \n", " newdict /Height 1 put \n", " newdict /DataSource pix put \n", " /mat [w 0 0 h 0 0] def \n", " newdict /ImageMatrix mat put \n", " 0 1 h 1 sub { \n", " mat 5 3 -1 roll neg put \n", " olddict /DataSource get str readstring pop pop \n", " /tail str def \n", " /x 0 def \n", " olddict /DataSource get pix readstring pop pop \n", " { \n", " tail transparent search dup /done exch not def \n", " {exch pop exch pop} if \n", " /w1 exch length def \n", " w1 0 ne { \n", " newdict /DataSource ", " pix x crpp mul w1 crpp mul getinterval put \n", " newdict /Width w1 put \n", " mat 4 x neg put \n", " /x x w1 add def \n", " newdict image \n", " /tail tail w1 tail length w1 sub getinterval def \n", " } if \n", " done {exit} if \n", " tail substrs { \n", " anchorsearch {pop} if \n", " } forall \n", " /tail exch def \n", " tail length 0 eq {exit} if \n", " /x w tail length sub def \n", " } loop \n", " } for \n", " end \n", " grestore \n", "} bind def \n\n\n", (char *) NULL); } else if( !codeIncluded && (colorLevel == 0) ) { /* * Monochrome-only code */ codeIncluded = !0; Tcl_AppendResult( interp, "/TkPhoto { \n", " gsave \n", " 32 dict begin \n", " /dummyInteger exch def \n", " /olddict exch def \n", " olddict /DataSource get dup type /filetype ne { \n", " olddict /DataSource 3 -1 roll \n", " 0 () /SubFileDecode filter put \n", " } { \n", " pop \n", " } ifelse \n", " /newdict olddict maxlength dict def \n", " olddict newdict copy pop \n", " /w newdict /Width get def \n", " /pix w 7 add 8 idiv string def \n", " /h newdict /Height get def \n", " 1 w div 1 h div matrix scale \n", " olddict /ImageMatrix get exch matrix concatmatrix \n", " matrix invertmatrix concat \n", " newdict /Height 1 put \n", " newdict /DataSource pix put \n", " /mat [w 0 0 h 0 0] def \n", " newdict /ImageMatrix mat put \n", " 0 1 h 1 sub { \n", " mat 5 3 -1 roll neg put \n", " 0.000 0.000 0.000 setrgbcolor \n", " olddict /DataSource get pix readstring pop pop \n", " newdict /DataSource pix put \n", " newdict imagemask \n", " 1.000 1.000 1.000 setrgbcolor \n", " olddict /DataSource get pix readstring pop pop \n", " newdict /DataSource pix put \n", " newdict imagemask \n", " } for \n", " end \n", " grestore \n", "} bind def \n\n\n", (char *) NULL); } /* * Check that at least one row of the image can be represented * with a string less than 64 KB long (this is a limit in the * Postscript interpreter). */ switch (colorLevel) { case 0: bytesPerLine = (width + 7) / 8; maxWidth = 240000; break; case 1: bytesPerLine = width; maxWidth = 60000; break; case 2: bytesPerLine = 3 * width; maxWidth = 20000; break; } if (bytesPerLine > 60000) { Tcl_ResetResult(interp); sprintf(buffer, "Can't generate Postscript for images more than %d pixels wide", maxWidth); Tcl_AppendResult(interp, buffer, (char *) NULL); return TCL_ERROR; } /* * Set up the postscript code except for the image-data stream. */ switch (colorLevel) { case 0: strcpy( cspace, "/DeviceGray"); strcpy( decode, "[1 0]"); bpc = 1; break; case 1: strcpy( cspace, "/DeviceGray"); strcpy( decode, "[0 1]"); bpc = 8; break; default: strcpy( cspace, "/DeviceRGB"); strcpy( decode, "[0 1 0 1 0 1]"); bpc = 8; break; } Tcl_AppendResult(interp, cspace, " setcolorspace\n\n", (char *) NULL); sprintf(buffer, " /Width %d\n /Height %d\n /BitsPerComponent %d\n", width, height, bpc); Tcl_AppendResult(interp, "<<\n /ImageType 1\n", buffer, " /DataSource currentfile", " /ASCIIHexDecode filter\n", (char *) NULL); sprintf(buffer, " /ImageMatrix [1 0 0 -1 0 %d]\n", height); Tcl_AppendResult(interp, buffer, " /Decode ", decode, "\n>>\n1 TkPhoto\n", (char *) NULL); /* * Check the PhotoImageBlock information. * We assume that: * if pixelSize is 1,2 or 4, the image is R,G,B,A; * if pixelSize is 3, the image is R,G,B and offset[3] is bogus. */ if (blockPtr->pixelSize == 3) { /* * No alpha information: the whole image is opaque. */ alphaPtr = &opaque; alphaPitch = alphaIncr = alphaOffset = 0; } else { /* * Set up alpha handling. */ alphaPtr = blockPtr->pixelPtr; alphaPitch = blockPtr->pitch; alphaIncr = blockPtr->pixelSize; alphaOffset = blockPtr->offset[3]; } for (yy = 0, lineLen=0; yy < height; yy++) { switch (colorLevel) { case 0: { /* * Generate data for image in monochrome mode. * No attempt at dithering is made--instead, just * set a threshold. * To handle transparecies we need to output two lines: * one for the black pixels, one for the white ones. */ unsigned char mask=0x80; unsigned char data=0x00; for (xx = 0; xx< width; xx ++) { pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch) + (xx *blockPtr->pixelSize); red = pixelPtr[blockPtr->offset[0]]; green = pixelPtr[blockPtr->offset[1]]; blue = pixelPtr[blockPtr->offset[2]]; alpha = *(alphaPtr + (yy * alphaPitch) + (xx * alphaIncr) + alphaOffset); /* * If pixel is less than threshold, then it is black. */ if ((alpha != 0) && ( 0.3086 * red + 0.6094 * green + 0.082 * blue < 128)) { data |= mask; } mask >>= 1; if (mask == 0) { sprintf(buffer, "%02X", data); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 2; if (lineLen >= 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } mask=0x80; data=0x00; } } if ((width % 8) != 0) { sprintf(buffer, "%02X", data); Tcl_AppendResult(interp, buffer, (char *) NULL); mask=0x80; data=0x00; } mask=0x80; data=0x00; for (xx = 0; xx< width; xx ++) { pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch) + (xx *blockPtr->pixelSize); red = pixelPtr[blockPtr->offset[0]]; green = pixelPtr[blockPtr->offset[1]]; blue = pixelPtr[blockPtr->offset[2]]; alpha = *(alphaPtr + (yy * alphaPitch) + (xx * alphaIncr) + alphaOffset); /* * If pixel is greater than threshold, then it is white. */ if ((alpha != 0) && ( 0.3086 * red + 0.6094 * green + 0.082 * blue >= 128)) { data |= mask; } mask >>= 1; if (mask == 0) { sprintf(buffer, "%02X", data); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 2; if (lineLen >= 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } mask=0x80; data=0x00; } } if ((width % 8) != 0) { sprintf(buffer, "%02X", data); Tcl_AppendResult(interp, buffer, (char *) NULL); mask=0x80; data=0x00; } break; } case 1: { /* * Generate transparency data. * We must prevent a transparent value of 0 * because of a bug in some HP printers. */ for (xx = 0; xx < width; xx ++) { alpha = *(alphaPtr + (yy * alphaPitch) + (xx * alphaIncr) + alphaOffset); sprintf(buffer, "%02X", alpha | 0x01); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 2; if (lineLen >= 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } } /* * Generate data in gray mode--in this case, take a * weighted sum of the red, green, and blue values. */ for (xx = 0; xx < width; xx ++) { pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch) + (xx *blockPtr->pixelSize); red = pixelPtr[blockPtr->offset[0]]; green = pixelPtr[blockPtr->offset[1]]; blue = pixelPtr[blockPtr->offset[2]]; sprintf(buffer, "%02X", (int) floor(0.5 + ( 0.3086 * red + 0.6094 * green + 0.0820 * blue))); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 2; if (lineLen >= 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } } break; } default: { /* * Generate transparency data. * We must prevent a transparent value of 0 * because of a bug in some HP printers. */ for (xx = 0; xx < width; xx ++) { alpha = *(alphaPtr + (yy * alphaPitch) + (xx * alphaIncr) + alphaOffset); sprintf(buffer, "%02X", alpha | 0x01); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 2; if (lineLen >= 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } } /* * Finally, color mode. Here, just output the red, green, * and blue values directly. */ for (xx = 0; xx < width; xx ++) { pixelPtr = blockPtr->pixelPtr + (yy * blockPtr->pitch) + (xx *blockPtr->pixelSize); sprintf(buffer, "%02X%02X%02X", pixelPtr[blockPtr->offset[0]], pixelPtr[blockPtr->offset[1]], pixelPtr[blockPtr->offset[2]]); Tcl_AppendResult(interp, buffer, (char *) NULL); lineLen += 6; if (lineLen >= 60) { lineLen = 0; Tcl_AppendResult(interp, "\n", (char *) NULL); } } break; } } } Tcl_AppendResult(interp, ">\n", (char *) NULL); return TCL_OK; }