/[dtapublic]/projs/ets/trunk/src/c_tk_base_7_5_w_mods/tkcanvtext.c

Diff of /projs/ets/trunk/src/c_tk_base_7_5_w_mods/tkcanvtext.c

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-projs/trunk/shared_source/c_tk_base_7_5_w_mods/tkcanvtext.c
revision 69 by dashley,
Sat Nov  5 10:54:17 2016 UTC
+projs/ets/trunk/src/c_tk_base_7_5_w_mods/tkcanvtext.c
revision 220 by dashley,
Sun Jul 22 15:58:07 2018 UTC
 Line 1
  /* $Header$ */
  /*
   * tkCanvText.c --
   *
   *      This file implements text items for canvas widgets.
   *
   * 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: tkcanvtext.c,v 1.1.1.1 2001/06/13 04:57:44 dtashley Exp $
   */
  #include <stdio.h>
  #include "tkInt.h"
  #include "tkCanvas.h"
  #include "tkPort.h"
  #include "default.h"
  /*
   * The structure below defines the record for each text item.
   */
  typedef struct TextItem  {
      Tk_Item header;             /* Generic stuff that's the same for all
                                   * types.  MUST BE FIRST IN STRUCTURE. */
      Tk_CanvasTextInfo *textInfoPtr;
                                  /* Pointer to a structure containing
                                   * information about the selection and
                                   * insertion cursor.  The structure is owned
                                   * by (and shared with) the generic canvas
                                   * code. */
      /*
       * Fields that are set by widget commands other than "configure".
       */
      double x, y;                /* Positioning point for text. */
      int insertPos;              /* Character index of character just before
                                   * which the insertion cursor is displayed. */
      /*
       * Configuration settings that are updated by Tk_ConfigureWidget.
       */
      Tk_Anchor anchor;           /* Where to anchor text relative to (x,y). */
      Tk_TSOffset tsoffset;
      XColor *color;              /* Color for text. */
      XColor *activeColor;        /* Color for text. */
      XColor *disabledColor;      /* Color for text. */
      Tk_Font tkfont;             /* Font for drawing text. */
      Tk_Justify justify;         /* Justification mode for text. */
      Pixmap stipple;             /* Stipple bitmap for text, or None. */
      Pixmap activeStipple;       /* Stipple bitmap for text, or None. */
      Pixmap disabledStipple;     /* Stipple bitmap for text, or None. */
      char *text;                 /* Text for item (malloc-ed). */
      int width;                  /* Width of lines for word-wrap, pixels.
                                   * Zero means no word-wrap. */
      /*
       * Fields whose values are derived from the current values of the
       * configuration settings above.
       */
      int numChars;               /* Length of text in characters. */
      int numBytes;               /* Length of text in bytes. */
      Tk_TextLayout textLayout;   /* Cached text layout information. */
      int leftEdge;               /* Pixel location of the left edge of the
                                   * text item; where the left border of the
                                   * text layout is drawn. */
      int rightEdge;              /* Pixel just to right of right edge of
                                   * area of text item.  Used for selecting up
                                   * to end of line. */
      GC gc;                      /* Graphics context for drawing text. */
      GC selTextGC;               /* Graphics context for selected text. */
      GC cursorOffGC;             /* If not None, this gives a graphics context
                                   * to use to draw the insertion cursor when
                                   * it's off.  Used if the selection and
                                   * insertion cursor colors are the same.  */
  } TextItem;
  /*
   * Information used for parsing configuration specs:
   */
  static Tk_CustomOption stateOption = {
      (Tk_OptionParseProc *) TkStateParseProc,
      TkStatePrintProc, (ClientData) 2
  };
  static Tk_CustomOption tagsOption = {
      (Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
      Tk_CanvasTagsPrintProc, (ClientData) NULL
  };
  static Tk_CustomOption offsetOption = {
      (Tk_OptionParseProc *) TkOffsetParseProc,
      TkOffsetPrintProc, (ClientData) (TK_OFFSET_RELATIVE)
  };
  static Tk_ConfigSpec configSpecs[] = {
      {TK_CONFIG_COLOR, "-activefill", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(TextItem, activeColor), TK_CONFIG_NULL_OK},
      {TK_CONFIG_BITMAP, "-activestipple", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(TextItem, activeStipple), TK_CONFIG_NULL_OK},
      {TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
          "center", Tk_Offset(TextItem, anchor),
          TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_COLOR, "-disabledfill", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(TextItem, disabledColor), TK_CONFIG_NULL_OK},
      {TK_CONFIG_BITMAP, "-disabledstipple", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(TextItem, disabledStipple), TK_CONFIG_NULL_OK},
      {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
          "black", Tk_Offset(TextItem, color), TK_CONFIG_NULL_OK},
      {TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL,
          DEF_CANVTEXT_FONT, Tk_Offset(TextItem, tkfont), 0},
      {TK_CONFIG_JUSTIFY, "-justify", (char *) NULL, (char *) NULL,
          "left", Tk_Offset(TextItem, justify),
          TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_CUSTOM, "-offset", (char *) NULL, (char *) NULL,
          "0,0", Tk_Offset(TextItem, tsoffset),
          TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
      {TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
          &stateOption},
      {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK},
      {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
          (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
      {TK_CONFIG_STRING, "-text", (char *) NULL, (char *) NULL,
          "", Tk_Offset(TextItem, text), 0},
      {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
          "0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
          (char *) NULL, 0, 0}
  };
  /*
   * Prototypes for procedures defined in this file:
   */
  static void             ComputeTextBbox _ANSI_ARGS_((Tk_Canvas canvas,
                              TextItem *textPtr));
  static int              ConfigureText _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
                              Tcl_Obj *CONST argv[], int flags));
  static int              CreateText _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, struct Tk_Item *itemPtr,
                              int argc, Tcl_Obj *CONST argv[]));
  static void             DeleteText _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, Display *display));
  static void             DisplayCanvText _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, Display *display, Drawable dst,
                              int x, int y, int width, int height));
  static int              GetSelText _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, int offset, char *buffer,
                              int maxBytes));
  static int              GetTextIndex _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr,
                              Tcl_Obj *obj, int *indexPtr));
  static void             ScaleText _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double originX, double originY,
                              double scaleX, double scaleY));
  static void             SetTextCursor _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, int index));
  static int              TextCoords _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr,
                              int argc, Tcl_Obj *CONST argv[]));
  static void             TextDeleteChars _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, int first, int last));
  static void             TextInsert _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, int beforeThis, char *string));
  static int              TextToArea _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double *rectPtr));
  static double           TextToPoint _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double *pointPtr));
  static int              TextToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
  static void             TranslateText _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double deltaX, double deltaY));
  /*
   * The structures below defines the rectangle and oval item types
   * by means of procedures that can be invoked by generic item code.
   */
  Tk_ItemType tkTextType = {
      "text",                     /* name */
      sizeof(TextItem),           /* itemSize */
      CreateText,                 /* createProc */
      configSpecs,                /* configSpecs */
      ConfigureText,              /* configureProc */
      TextCoords,                 /* coordProc */
      DeleteText,                 /* deleteProc */
      DisplayCanvText,            /* displayProc */
      TK_CONFIG_OBJS,             /* flags */
      TextToPoint,                /* pointProc */
      TextToArea,                 /* areaProc */
      TextToPostscript,           /* postscriptProc */
      ScaleText,                  /* scaleProc */
      TranslateText,              /* translateProc */
      (Tk_ItemIndexProc *) GetTextIndex,/* indexProc */
      SetTextCursor,              /* icursorProc */
      GetSelText,                 /* selectionProc */
      TextInsert,                 /* insertProc */
      TextDeleteChars,            /* dTextProc */
      (Tk_ItemType *) NULL,       /* nextPtr */
  };
  /*
   *--------------------------------------------------------------
   *
   * CreateText --
   *
   *      This procedure is invoked to create a new text item
   *      in a canvas.
   *
   * Results:
   *      A standard Tcl return value.  If an error occurred in
   *      creating the item then an error message is left in
   *      the interp's result;  in this case itemPtr is left uninitialized
   *      so it can be safely freed by the caller.
   *
   * Side effects:
   *      A new text item is created.
   *
   *--------------------------------------------------------------
   */
  static int
  CreateText(interp, canvas, itemPtr, argc, argv)
      Tcl_Interp *interp;         /* Interpreter for error reporting. */
      Tk_Canvas canvas;           /* Canvas to hold new item. */
      Tk_Item *itemPtr;           /* Record to hold new item; header has been
                                   * initialized by caller. */
      int argc;                   /* Number of arguments in argv. */
      Tcl_Obj *CONST argv[];      /* Arguments describing rectangle. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      int i;
      if (argc==1) {
          i = 1;
      } else {
          char *arg = Tcl_GetStringFromObj(argv[1], NULL);
          if ((argc>1) && (arg[0] == '-')
                  && (arg[1] >= 'a') && (arg[1] <= 'z')) {
              i = 1;
          } else {
              i = 2;
          }
      }
      if (argc < i) {
          Tcl_AppendResult(interp, "wrong # args: should be \"",
                  Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
                  itemPtr->typePtr->name, " x y ?options?\"", (char *) NULL);
          return TCL_ERROR;
      }
      /*
       * Carry out initialization that is needed in order to clean up after
       * errors during the the remainder of this procedure.
       */
      textPtr->textInfoPtr = Tk_CanvasGetTextInfo(canvas);
      textPtr->insertPos  = 0;
      textPtr->anchor     = TK_ANCHOR_CENTER;
      textPtr->tsoffset.flags = 0;
      textPtr->tsoffset.xoffset = 0;
      textPtr->tsoffset.yoffset = 0;
      textPtr->color      = NULL;
      textPtr->activeColor = NULL;
      textPtr->disabledColor = NULL;
      textPtr->tkfont     = NULL;
      textPtr->justify    = TK_JUSTIFY_LEFT;
      textPtr->stipple    = None;
      textPtr->activeStipple = None;
      textPtr->disabledStipple = None;
      textPtr->text       = NULL;
      textPtr->width      = 0;
      textPtr->numChars   = 0;
      textPtr->numBytes   = 0;
      textPtr->textLayout = NULL;
      textPtr->leftEdge   = 0;
      textPtr->rightEdge  = 0;
      textPtr->gc         = None;
      textPtr->selTextGC  = None;
      textPtr->cursorOffGC = None;
      /*
       * Process the arguments to fill in the item record.
       */
      if ((TextCoords(interp, canvas, itemPtr, i, argv) != TCL_OK)) {
          goto error;
      }
      if (ConfigureText(interp, canvas, itemPtr, argc-i, argv+i, 0) == TCL_OK) {
          return TCL_OK;
      }
      error:
      DeleteText(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
      return TCL_ERROR;
  }
  /*
   *--------------------------------------------------------------
   *
   * TextCoords --
   *
   *      This procedure is invoked to process the "coords" widget
   *      command on text items.  See the user documentation for
   *      details on what it does.
   *
   * Results:
   *      Returns TCL_OK or TCL_ERROR, and sets the interp's result.
   *
   * Side effects:
   *      The coordinates for the given item may be changed.
   *
   *--------------------------------------------------------------
   */
  static int
  TextCoords(interp, canvas, itemPtr, argc, argv)
      Tcl_Interp *interp;         /* Used for error reporting. */
      Tk_Canvas canvas;           /* Canvas containing item. */
      Tk_Item *itemPtr;           /* Item whose coordinates are to be read or
                                   * modified. */
      int argc;                   /* Number of coordinates supplied in argv. */
      Tcl_Obj *CONST argv[];      /* Array of coordinates: x1, y1, x2, y2, ... */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      if (argc == 0) {
          Tcl_Obj *obj = Tcl_NewObj();
          Tcl_Obj *subobj = Tcl_NewDoubleObj(textPtr->x);
          Tcl_ListObjAppendElement(interp, obj, subobj);
          subobj = Tcl_NewDoubleObj(textPtr->y);
          Tcl_ListObjAppendElement(interp, obj, subobj);
          Tcl_SetObjResult(interp, obj);
      } else if (argc < 3) {
          if (argc==1) {
              if (Tcl_ListObjGetElements(interp, argv[0], &argc,
                      (Tcl_Obj ***) &argv) != TCL_OK) {
                  return TCL_ERROR;
              } else if (argc != 2) {
                  char buf[64 + TCL_INTEGER_SPACE];
                  sprintf(buf, "wrong # coordinates: expected 2, got %d", argc);
                  Tcl_SetResult(interp, buf, TCL_VOLATILE);
                  return TCL_ERROR;
              }
          }
          if ((Tk_CanvasGetCoordFromObj(interp, canvas, argv[0], &textPtr->x) != TCL_OK)
                  || (Tk_CanvasGetCoordFromObj(interp, canvas, argv[1],
                      &textPtr->y) != TCL_OK)) {
              return TCL_ERROR;
          }
          ComputeTextBbox(canvas, textPtr);
      } else {
          char buf[64 + TCL_INTEGER_SPACE];
          sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", argc);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
          return TCL_ERROR;
      }
      return TCL_OK;
  }
  /*
   *--------------------------------------------------------------
   *
   * ConfigureText --
   *
   *      This procedure is invoked to configure various aspects
   *      of a text item, such as its border and background colors.
   *
   * Results:
   *      A standard Tcl result code.  If an error occurs, then
   *      an error message is left in the interp's result.
   *
   * Side effects:
   *      Configuration information, such as colors and stipple
   *      patterns, may be set for itemPtr.
   *
   *--------------------------------------------------------------
   */
  static int
  ConfigureText(interp, canvas, itemPtr, argc, argv, flags)
      Tcl_Interp *interp;         /* Interpreter for error reporting. */
      Tk_Canvas canvas;           /* Canvas containing itemPtr. */
      Tk_Item *itemPtr;           /* Rectangle item to reconfigure. */
      int argc;                   /* Number of elements in argv.  */
      Tcl_Obj *CONST argv[];      /* Arguments describing things to configure. */
      int flags;                  /* Flags to pass to Tk_ConfigureWidget. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      XGCValues gcValues;
      GC newGC, newSelGC;
      unsigned long mask;
      Tk_Window tkwin;
      Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
      XColor *selBgColorPtr;
      XColor *color;
      Pixmap stipple;
      Tk_State state;
      tkwin = Tk_CanvasTkwin(canvas);
      if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, (char **) argv,
              (char *) textPtr, flags|TK_CONFIG_OBJS) != TCL_OK) {
          return TCL_ERROR;
      }
      /*
       * A few of the options require additional processing, such as
       * graphics contexts.
       */
      state = itemPtr->state;
      if (textPtr->activeColor != NULL ||
              textPtr->activeStipple != None) {
          itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
      } else {
          itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
      }
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      color = textPtr->color;
      stipple = textPtr->stipple;
      if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
          if (textPtr->activeColor!=NULL) {
              color = textPtr->activeColor;
          }
          if (textPtr->activeStipple!=None) {
              stipple = textPtr->activeStipple;
          }
      } else if (state==TK_STATE_DISABLED) {
          if (textPtr->disabledColor!=NULL) {
              color = textPtr->disabledColor;
          }
          if (textPtr->disabledStipple!=None) {
              stipple = textPtr->disabledStipple;
          }
      }
      newGC = newSelGC = None;
      if (textPtr->tkfont != NULL) {
          gcValues.font = Tk_FontId(textPtr->tkfont);
          mask = GCFont;
          if (color != NULL) {
              gcValues.foreground = color->pixel;
              mask |= GCForeground;
              if (stipple != None) {
                  gcValues.stipple = stipple;
                  gcValues.fill_style = FillStippled;
                  mask |= GCStipple|GCFillStyle;
              }
              newGC = Tk_GetGC(tkwin, mask, &gcValues);
          }
          mask &= ~(GCTile|GCFillStyle|GCStipple);
          if (stipple != None) {
              gcValues.stipple = stipple;
              gcValues.fill_style = FillStippled;
              mask |= GCStipple|GCFillStyle;
          }
          gcValues.foreground = textInfoPtr->selFgColorPtr->pixel;
          newSelGC = Tk_GetGC(tkwin, mask|GCForeground, &gcValues);
      }
      if (textPtr->gc != None) {
          Tk_FreeGC(Tk_Display(tkwin), textPtr->gc);
      }
      textPtr->gc = newGC;
      if (textPtr->selTextGC != None) {
          Tk_FreeGC(Tk_Display(tkwin), textPtr->selTextGC);
      }
      textPtr->selTextGC = newSelGC;
      selBgColorPtr = Tk_3DBorderColor(textInfoPtr->selBorder);
      if (Tk_3DBorderColor(textInfoPtr->insertBorder)->pixel
              == selBgColorPtr->pixel) {
          if (selBgColorPtr->pixel == BlackPixelOfScreen(Tk_Screen(tkwin))) {
              gcValues.foreground = WhitePixelOfScreen(Tk_Screen(tkwin));
          } else {
              gcValues.foreground = BlackPixelOfScreen(Tk_Screen(tkwin));
          }
          newGC = Tk_GetGC(tkwin, GCForeground, &gcValues);
      } else {
          newGC = None;
      }
      if (textPtr->cursorOffGC != None) {
          Tk_FreeGC(Tk_Display(tkwin), textPtr->cursorOffGC);
      }
      textPtr->cursorOffGC = newGC;
      /*
       * If the text was changed, move the selection and insertion indices
       * to keep them inside the item.
       */
      textPtr->numBytes = strlen(textPtr->text);
      textPtr->numChars = Tcl_NumUtfChars(textPtr->text, textPtr->numBytes);
      if (textInfoPtr->selItemPtr == itemPtr) {
          if (textInfoPtr->selectFirst >= textPtr->numChars) {
              textInfoPtr->selItemPtr = NULL;
          } else {
              if (textInfoPtr->selectLast >= textPtr->numChars) {
                  textInfoPtr->selectLast = textPtr->numChars - 1;
              }
              if ((textInfoPtr->anchorItemPtr == itemPtr)
                      && (textInfoPtr->selectAnchor >= textPtr->numChars)) {
                  textInfoPtr->selectAnchor = textPtr->numChars - 1;
              }
          }
      }
      if (textPtr->insertPos >= textPtr->numChars) {
          textPtr->insertPos = textPtr->numChars;
      }
      ComputeTextBbox(canvas, textPtr);
      return TCL_OK;
  }
  /*
   *--------------------------------------------------------------
   *
   * DeleteText --
   *
   *      This procedure is called to clean up the data structure
   *      associated with a text item.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Resources associated with itemPtr are released.
   *
   *--------------------------------------------------------------
   */
  static void
  DeleteText(canvas, itemPtr, display)
      Tk_Canvas canvas;           /* Info about overall canvas widget. */
      Tk_Item *itemPtr;           /* Item that is being deleted. */
      Display *display;           /* Display containing window for canvas. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      if (textPtr->color != NULL) {
          Tk_FreeColor(textPtr->color);
      }
      if (textPtr->activeColor != NULL) {
          Tk_FreeColor(textPtr->activeColor);
      }
      if (textPtr->disabledColor != NULL) {
          Tk_FreeColor(textPtr->disabledColor);
      }
      Tk_FreeFont(textPtr->tkfont);
      if (textPtr->stipple != None) {
          Tk_FreeBitmap(display, textPtr->stipple);
      }
      if (textPtr->activeStipple != None) {
          Tk_FreeBitmap(display, textPtr->activeStipple);
      }
      if (textPtr->disabledStipple != None) {
          Tk_FreeBitmap(display, textPtr->disabledStipple);
      }
      if (textPtr->text != NULL) {
          ckfree(textPtr->text);
      }
      Tk_FreeTextLayout(textPtr->textLayout);
      if (textPtr->gc != None) {
          Tk_FreeGC(display, textPtr->gc);
      }
      if (textPtr->selTextGC != None) {
          Tk_FreeGC(display, textPtr->selTextGC);
      }
      if (textPtr->cursorOffGC != None) {
          Tk_FreeGC(display, textPtr->cursorOffGC);
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * ComputeTextBbox --
   *
   *      This procedure is invoked to compute the bounding box of
   *      all the pixels that may be drawn as part of a text item.
   *      In addition, it recomputes all of the geometry information
   *      used to display a text item or check for mouse hits.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The fields x1, y1, x2, and y2 are updated in the header
   *      for itemPtr, and the linePtr structure is regenerated
   *      for itemPtr.
   *
   *--------------------------------------------------------------
   */
  static void
  ComputeTextBbox(canvas, textPtr)
      Tk_Canvas canvas;           /* Canvas that contains item. */
      TextItem *textPtr;          /* Item whose bbox is to be recomputed. */
  {
      Tk_CanvasTextInfo *textInfoPtr;
      int leftX, topY, width, height, fudge;
      Tk_State state = textPtr->header.state;
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      Tk_FreeTextLayout(textPtr->textLayout);
      textPtr->textLayout = Tk_ComputeTextLayout(textPtr->tkfont,
              textPtr->text, textPtr->numChars, textPtr->width,
              textPtr->justify, 0, &width, &height);
      if (state == TK_STATE_HIDDEN || textPtr->color == NULL) {
          width = height = 0;
      }
      /*
       * Use overall geometry information to compute the top-left corner
       * of the bounding box for the text item.
       */
      leftX = (int) (textPtr->x + 0.5);
      topY = (int) (textPtr->y + 0.5);
      switch (textPtr->anchor) {
          case TK_ANCHOR_NW:
          case TK_ANCHOR_N:
          case TK_ANCHOR_NE:
              break;
          case TK_ANCHOR_W:
          case TK_ANCHOR_CENTER:
          case TK_ANCHOR_E:
              topY -= height / 2;
              break;
          case TK_ANCHOR_SW:
          case TK_ANCHOR_S:
          case TK_ANCHOR_SE:
              topY -= height;
              break;
      }
      switch (textPtr->anchor) {
          case TK_ANCHOR_NW:
          case TK_ANCHOR_W:
          case TK_ANCHOR_SW:
              break;
          case TK_ANCHOR_N:
          case TK_ANCHOR_CENTER:
          case TK_ANCHOR_S:
              leftX -= width / 2;
              break;
          case TK_ANCHOR_NE:
          case TK_ANCHOR_E:
          case TK_ANCHOR_SE:
              leftX -= width;
              break;
      }
      textPtr->leftEdge  = leftX;
      textPtr->rightEdge = leftX + width;
      /*
       * Last of all, update the bounding box for the item.  The item's
       * bounding box includes the bounding box of all its lines, plus
       * an extra fudge factor for the cursor border (which could
       * potentially be quite large).
       */
      textInfoPtr = textPtr->textInfoPtr;
      fudge = (textInfoPtr->insertWidth + 1) / 2;
      if (textInfoPtr->selBorderWidth > fudge) {
          fudge = textInfoPtr->selBorderWidth;
      }
      textPtr->header.x1 = leftX - fudge;
      textPtr->header.y1 = topY;
      textPtr->header.x2 = leftX + width + fudge;
      textPtr->header.y2 = topY + height;
  }
  /*
   *--------------------------------------------------------------
   *
   * DisplayCanvText --
   *
   *      This procedure is invoked to draw a text item in a given
   *      drawable.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      ItemPtr is drawn in drawable using the transformation
   *      information in canvas.
   *
   *--------------------------------------------------------------
   */
  static void
  DisplayCanvText(canvas, itemPtr, display, drawable, x, y, width, height)
      Tk_Canvas canvas;           /* Canvas that contains item. */
      Tk_Item *itemPtr;           /* Item to be displayed. */
      Display *display;           /* Display on which to draw item. */
      Drawable drawable;          /* Pixmap or window in which to draw item. */
      int x, y, width, height;    /* Describes region of canvas that must be
                                   * redisplayed (not used). */
  {
      TextItem *textPtr;
      Tk_CanvasTextInfo *textInfoPtr;
      int selFirstChar, selLastChar;
      short drawableX, drawableY;
      Pixmap stipple;
      Tk_State state = itemPtr->state;
      textPtr = (TextItem *) itemPtr;
      textInfoPtr = textPtr->textInfoPtr;
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      stipple = textPtr->stipple;
      if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
          if (textPtr->activeStipple!=None) {
              stipple = textPtr->activeStipple;
          }
      } else if (state==TK_STATE_DISABLED) {
          if (textPtr->disabledStipple!=None) {
              stipple = textPtr->disabledStipple;
          }
      }
      if (textPtr->gc == None) {
          return;
      }
      /*
       * If we're stippling, then modify the stipple offset in the GC.  Be
       * sure to reset the offset when done, since the GC is supposed to be
       * read-only.
       */
      if (stipple != None) {
          Tk_CanvasSetOffset(canvas, textPtr->gc, &textPtr->tsoffset);
      }
      selFirstChar = -1;
      selLastChar = 0;            /* lint. */
      if (textInfoPtr->selItemPtr == itemPtr) {
          selFirstChar = textInfoPtr->selectFirst;
          selLastChar = textInfoPtr->selectLast;
          if (selLastChar > textPtr->numChars) {
              selLastChar = textPtr->numChars - 1;
          }
          if ((selFirstChar >= 0) && (selFirstChar <= selLastChar)) {
              int xFirst, yFirst, hFirst;
              int xLast, yLast;
              /*
               * Draw a special background under the selection.
               */
              Tk_CharBbox(textPtr->textLayout, selFirstChar, &xFirst, &yFirst,
                      NULL, &hFirst);
              Tk_CharBbox(textPtr->textLayout, selLastChar, &xLast, &yLast,
                      NULL, NULL);
              /*
               * If the selection spans the end of this line, then display
               * selection background all the way to the end of the line.
               * However, for the last line we only want to display up to the
               * last character, not the end of the line.
               */
              x = xFirst;
              height = hFirst;
              for (y = yFirst ; y <= yLast; y += height) {
                  if (y == yLast) {
                      width = xLast - x;
                  } else {
                      width = textPtr->rightEdge - textPtr->leftEdge - x;
                  }
                  Tk_CanvasDrawableCoords(canvas,
                          (double) (textPtr->leftEdge + x
                                  - textInfoPtr->selBorderWidth),
                          (double) (textPtr->header.y1 + y),
                          &drawableX, &drawableY);
                  Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
                          textInfoPtr->selBorder, drawableX, drawableY,
                          width + 2 * textInfoPtr->selBorderWidth,
                          height, textInfoPtr->selBorderWidth, TK_RELIEF_RAISED);
                  x = 0;
              }
          }
      }
      /*
       * If the insertion point should be displayed, then draw a special
       * background for the cursor before drawing the text.  Note:  if
       * we're the cursor item but the cursor is turned off, then redraw
       * background over the area of the cursor.  This guarantees that
       * the selection won't make the cursor invisible on mono displays,
       * where both are drawn in the same color.
       */
      if ((textInfoPtr->focusItemPtr == itemPtr) && (textInfoPtr->gotFocus)) {
          if (Tk_CharBbox(textPtr->textLayout, textPtr->insertPos,
                  &x, &y, NULL, &height)) {
              Tk_CanvasDrawableCoords(canvas,
                      (double) (textPtr->leftEdge + x
                              - (textInfoPtr->insertWidth / 2)),
                      (double) (textPtr->header.y1 + y),
                      &drawableX, &drawableY);
              if (textInfoPtr->cursorOn) {
                  Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
                          textInfoPtr->insertBorder,
                          drawableX, drawableY,
                          textInfoPtr->insertWidth, height,
                          textInfoPtr->insertBorderWidth, TK_RELIEF_RAISED);
              } else if (textPtr->cursorOffGC != None) {
                  /*
                   * Redraw the background over the area of the cursor,
                   * even though the cursor is turned off.  This
                   * guarantees that the selection won't make the cursor
                   * invisible on mono displays, where both may be drawn
                   * in the same color.
                   */
                  XFillRectangle(display, drawable, textPtr->cursorOffGC,
                          drawableX, drawableY,
                          (unsigned) textInfoPtr->insertWidth,
                          (unsigned) height);
              }
          }
      }
      /*
       * Display the text in two pieces: draw the entire text item, then
       * draw the selected text on top of it.  The selected text then
       * will only need to be drawn if it has different attributes (such
       * as foreground color) than regular text.
       */
      Tk_CanvasDrawableCoords(canvas, (double) textPtr->leftEdge,
              (double) textPtr->header.y1, &drawableX, &drawableY);
      Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
              drawableX, drawableY, 0, -1);
      if ((selFirstChar >= 0) && (textPtr->selTextGC != textPtr->gc)) {
          Tk_DrawTextLayout(display, drawable, textPtr->selTextGC,
              textPtr->textLayout, drawableX, drawableY, selFirstChar,
              selLastChar + 1);
      }
      if (stipple != None) {
          XSetTSOrigin(display, textPtr->gc, 0, 0);
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * TextInsert --
   *
   *      Insert characters into a text item at a given position.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The text in the given item is modified.  The cursor and
   *      selection positions are also modified to reflect the
   *      insertion.
   *
   *--------------------------------------------------------------
   */
  static void
  TextInsert(canvas, itemPtr, index, string)
      Tk_Canvas canvas;           /* Canvas containing text item. */
      Tk_Item *itemPtr;           /* Text item to be modified. */
      int index;                  /* Character index before which string is
                                   * to be inserted. */
      char *string;               /* New characters to be inserted. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      int byteIndex, byteCount, charsAdded;
      char *new, *text;
      Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
      string = Tcl_GetStringFromObj((Tcl_Obj *) string, &byteCount);
      text = textPtr->text;
      if (index < 0) {
          index = 0;
      }
      if (index > textPtr->numChars) {
          index = textPtr->numChars;
      }
      byteIndex = Tcl_UtfAtIndex(text, index) - text;
      byteCount = strlen(string);
      if (byteCount == 0) {
          return;
      }
      new = (char *) ckalloc((unsigned) textPtr->numBytes + byteCount + 1);
      memcpy(new, text, (size_t) byteIndex);
      strcpy(new + byteIndex, string);
      strcpy(new + byteIndex + byteCount, text + byteIndex);
      ckfree(text);
      textPtr->text = new;
      charsAdded = Tcl_NumUtfChars(string, byteCount);
      textPtr->numChars += charsAdded;
      textPtr->numBytes += byteCount;
      /*
       * Inserting characters invalidates indices such as those for the
       * selection and cursor.  Update the indices appropriately.
       */
      if (textInfoPtr->selItemPtr == itemPtr) {
          if (textInfoPtr->selectFirst >= index) {
              textInfoPtr->selectFirst += charsAdded;
          }
          if (textInfoPtr->selectLast >= index) {
              textInfoPtr->selectLast += charsAdded;
          }
          if ((textInfoPtr->anchorItemPtr == itemPtr)
                  && (textInfoPtr->selectAnchor >= index)) {
              textInfoPtr->selectAnchor += charsAdded;
          }
      }
      if (textPtr->insertPos >= index) {
          textPtr->insertPos += charsAdded;
      }
      ComputeTextBbox(canvas, textPtr);
  }
  /*
   *--------------------------------------------------------------
   *
   * TextDeleteChars --
   *
   *      Delete one or more characters from a text item.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Characters between "first" and "last", inclusive, get
   *      deleted from itemPtr, and things like the selection
   *      position get updated.
   *
   *--------------------------------------------------------------
   */
  static void
  TextDeleteChars(canvas, itemPtr, first, last)
      Tk_Canvas canvas;           /* Canvas containing itemPtr. */
      Tk_Item *itemPtr;           /* Item in which to delete characters. */
      int first;                  /* Character index of first character to
                                   * delete. */
      int last;                   /* Character index of last character to
                                   * delete (inclusive). */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      int byteIndex, byteCount, charsRemoved;
      char *new, *text;
      Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
      text = textPtr->text;
      if (first < 0) {
          first = 0;
      }
      if (last >= textPtr->numChars) {
          last = textPtr->numChars - 1;
      }
      if (first > last) {
          return;
      }
      charsRemoved = last + 1 - first;
      byteIndex = Tcl_UtfAtIndex(text, first) - text;
      byteCount = Tcl_UtfAtIndex(text + byteIndex, charsRemoved)
          - (text + byteIndex);
      new = (char *) ckalloc((unsigned) (textPtr->numBytes + 1 - byteCount));
      memcpy(new, text, (size_t) byteIndex);
      strcpy(new + byteIndex, text + byteIndex + byteCount);
      ckfree(text);
      textPtr->text = new;
      textPtr->numChars -= charsRemoved;
      textPtr->numBytes -= byteCount;
      /*
       * Update indexes for the selection and cursor to reflect the
       * renumbering of the remaining characters.
       */
      if (textInfoPtr->selItemPtr == itemPtr) {
          if (textInfoPtr->selectFirst > first) {
              textInfoPtr->selectFirst -= charsRemoved;
              if (textInfoPtr->selectFirst < first) {
                  textInfoPtr->selectFirst = first;
              }
          }
          if (textInfoPtr->selectLast >= first) {
              textInfoPtr->selectLast -= charsRemoved;
              if (textInfoPtr->selectLast < first - 1) {
                  textInfoPtr->selectLast = first - 1;
              }
          }
          if (textInfoPtr->selectFirst > textInfoPtr->selectLast) {
              textInfoPtr->selItemPtr = NULL;
          }
          if ((textInfoPtr->anchorItemPtr == itemPtr)
                  && (textInfoPtr->selectAnchor > first)) {
              textInfoPtr->selectAnchor -= charsRemoved;
              if (textInfoPtr->selectAnchor < first) {
                  textInfoPtr->selectAnchor = first;
              }
          }
      }
      if (textPtr->insertPos > first) {
          textPtr->insertPos -= charsRemoved;
          if (textPtr->insertPos < first) {
              textPtr->insertPos = first;
          }
      }
      ComputeTextBbox(canvas, textPtr);
      return;
  }
  /*
   *--------------------------------------------------------------
   *
   * TextToPoint --
   *
   *      Computes the distance from a given point to a given
   *      text item, in canvas units.
   *
   * Results:
   *      The return value is 0 if the point whose x and y coordinates
   *      are pointPtr[0] and pointPtr[1] is inside the text item.  If
   *      the point isn't inside the text item then the return value
   *      is the distance from the point to the text item.
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
  static double
  TextToPoint(canvas, itemPtr, pointPtr)
      Tk_Canvas canvas;           /* Canvas containing itemPtr. */
      Tk_Item *itemPtr;           /* Item to check against point. */
      double *pointPtr;           /* Pointer to x and y coordinates. */
  {
      TextItem *textPtr;
      Tk_State state = itemPtr->state;
      double value;
      if (state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      textPtr = (TextItem *) itemPtr;
      value =  (double) Tk_DistanceToTextLayout(textPtr->textLayout,
              (int) pointPtr[0] - textPtr->leftEdge,
              (int) pointPtr[1] - textPtr->header.y1);
      if ((state == TK_STATE_HIDDEN) || (textPtr->color == NULL) ||
              (textPtr->text == NULL) || (*textPtr->text == 0)) {
          value = 1.0e36;
      }
      return value;
  }
  /*
   *--------------------------------------------------------------
   *
   * TextToArea --
   *
   *      This procedure is called to determine whether an item
   *      lies entirely inside, entirely outside, or overlapping
   *      a given rectangle.
   *
   * Results:
   *      -1 is returned if the item is entirely outside the area
   *      given by rectPtr, 0 if it overlaps, and 1 if it is entirely
   *      inside the given area.
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
  static int
  TextToArea(canvas, itemPtr, rectPtr)
      Tk_Canvas canvas;           /* Canvas containing itemPtr. */
      Tk_Item *itemPtr;           /* Item to check against rectangle. */
      double *rectPtr;            /* Pointer to array of four coordinates
                                   * (x1, y1, x2, y2) describing rectangular
                                   * area.  */
  {
      TextItem *textPtr;
      Tk_State state = itemPtr->state;
      if (state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      textPtr = (TextItem *) itemPtr;
      return Tk_IntersectTextLayout(textPtr->textLayout,
              (int) (rectPtr[0] + 0.5) - textPtr->leftEdge,
              (int) (rectPtr[1] + 0.5) - textPtr->header.y1,
              (int) (rectPtr[2] - rectPtr[0] + 0.5),
              (int) (rectPtr[3] - rectPtr[1] + 0.5));
  }
  /*
   *--------------------------------------------------------------
   *
   * ScaleText --
   *
   *      This procedure is invoked to rescale a text item.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Scales the position of the text, but not the size
   *      of the font for the text.
   *
   *--------------------------------------------------------------
   */
          /* ARGSUSED */
  static void
  ScaleText(canvas, itemPtr, originX, originY, scaleX, scaleY)
      Tk_Canvas canvas;           /* Canvas containing rectangle. */
      Tk_Item *itemPtr;           /* Rectangle to be scaled. */
      double originX, originY;    /* Origin about which to scale rect. */
      double scaleX;              /* Amount to scale in X direction. */
      double scaleY;              /* Amount to scale in Y direction. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      textPtr->x = originX + scaleX*(textPtr->x - originX);
      textPtr->y = originY + scaleY*(textPtr->y - originY);
      ComputeTextBbox(canvas, textPtr);
      return;
  }
  /*
   *--------------------------------------------------------------
   *
   * TranslateText --
   *
   *      This procedure is called to move a text item by a
   *      given amount.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The position of the text item is offset by (xDelta, yDelta),
   *      and the bounding box is updated in the generic part of the
   *      item structure.
   *
   *--------------------------------------------------------------
   */
  static void
  TranslateText(canvas, itemPtr, deltaX, deltaY)
      Tk_Canvas canvas;           /* Canvas containing item. */
      Tk_Item *itemPtr;           /* Item that is being moved. */
      double deltaX, deltaY;      /* Amount by which item is to be moved. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      textPtr->x += deltaX;
      textPtr->y += deltaY;
      ComputeTextBbox(canvas, textPtr);
  }
  /*
   *--------------------------------------------------------------
   *
   * GetTextIndex --
   *
   *      Parse an index into a text item and return either its value
   *      or an error.
   *
   * Results:
   *      A standard Tcl result.  If all went well, then *indexPtr is
   *      filled in with the index (into itemPtr) corresponding to
   *      string.  Otherwise an error message is left in
   *      the interp's result.
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
  static int
  GetTextIndex(interp, canvas, itemPtr, obj, indexPtr)
      Tcl_Interp *interp;         /* Used for error reporting. */
      Tk_Canvas canvas;           /* Canvas containing item. */
      Tk_Item *itemPtr;           /* Item for which the index is being
                                   * specified. */
      Tcl_Obj *obj;               /* Specification of a particular character
                                   * in itemPtr's text. */
      int *indexPtr;              /* Where to store converted character
                                   * index. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      size_t length;
      int c;
      TkCanvas *canvasPtr = (TkCanvas *) canvas;
      Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
      char *string = Tcl_GetStringFromObj(obj, (int *) &length);
      c = string[0];
      length = strlen(string);
      if ((c == 'e') && (strncmp(string, "end", length) == 0)) {
          *indexPtr = textPtr->numChars;
      } else if ((c == 'i') && (strncmp(string, "insert", length) == 0)) {
          *indexPtr = textPtr->insertPos;
      } else if ((c == 's') && (strncmp(string, "sel.first", length) == 0)
              && (length >= 5)) {
          if (textInfoPtr->selItemPtr != itemPtr) {
              Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);
              return TCL_ERROR;
          }
          *indexPtr = textInfoPtr->selectFirst;
      } else if ((c == 's') && (strncmp(string, "sel.last", length) == 0)
              && (length >= 5)) {
          if (textInfoPtr->selItemPtr != itemPtr) {
              Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);
              return TCL_ERROR;
          }
          *indexPtr = textInfoPtr->selectLast;
      } else if (c == '@') {
          int x, y;
          double tmp;
          char *end, *p;
          p = string+1;
          tmp = strtod(p, &end);
          if ((end == p) || (*end != ',')) {
              goto badIndex;
          }
          x = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5);
          p = end+1;
          tmp = strtod(p, &end);
          if ((end == p) || (*end != 0)) {
              goto badIndex;
          }
          y = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5);
          *indexPtr = Tk_PointToChar(textPtr->textLayout,
                  x + canvasPtr->scrollX1 - textPtr->leftEdge,
                  y + canvasPtr->scrollY1 - textPtr->header.y1);
      } else if (Tcl_GetIntFromObj((Tcl_Interp *)NULL, obj, indexPtr) == TCL_OK) {
          if (*indexPtr < 0){
              *indexPtr = 0;
          } else if (*indexPtr > textPtr->numChars) {
              *indexPtr = textPtr->numChars;
          }
      } else {
          /*
           * Some of the paths here leave messages in the interp's result,
           * so we have to clear it out before storing our own message.
           */
          badIndex:
          Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
          Tcl_AppendResult(interp, "bad index \"", string, "\"",
                  (char *) NULL);
          return TCL_ERROR;
      }
      return TCL_OK;
  }
  /*
   *--------------------------------------------------------------
   *
   * SetTextCursor --
   *
   *      Set the position of the insertion cursor in this item.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The cursor position will change.
   *
   *--------------------------------------------------------------
   */
          /* ARGSUSED */
  static void
  SetTextCursor(canvas, itemPtr, index)
      Tk_Canvas canvas;           /* Record describing canvas widget. */
      Tk_Item *itemPtr;           /* Text item in which cursor position is to
                                   * be set. */
      int index;                  /* Character index of character just before
                                   * which cursor is to be positioned. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      if (index < 0) {
          textPtr->insertPos = 0;
      } else  if (index > textPtr->numChars) {
          textPtr->insertPos = textPtr->numChars;
      } else {
          textPtr->insertPos = index;
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * GetSelText --
   *
   *      This procedure is invoked to return the selected portion
   *      of a text item.  It is only called when this item has
   *      the selection.
   *
   * Results:
   *      The return value is the number of non-NULL bytes stored
   *      at buffer.  Buffer is filled (or partially filled) with a
   *      NULL-terminated string containing part or all of the selection,
   *      as given by offset and maxBytes.
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
  static int
  GetSelText(canvas, itemPtr, offset, buffer, maxBytes)
      Tk_Canvas canvas;           /* Canvas containing selection. */
      Tk_Item *itemPtr;           /* Text item containing selection. */
      int offset;                 /* Byte offset within selection of first
                                   * character to be returned. */
      char *buffer;               /* Location in which to place selection. */
      int maxBytes;               /* Maximum number of bytes to place at
                                   * buffer, not including terminating NULL
                                   * character. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      int byteCount;
      char *text, *selStart, *selEnd;
      Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
      if ((textInfoPtr->selectFirst < 0) ||
              (textInfoPtr->selectFirst > textInfoPtr->selectLast)) {
          return 0;
      }
      text = textPtr->text;
      selStart = Tcl_UtfAtIndex(text, textInfoPtr->selectFirst);
      selEnd = Tcl_UtfAtIndex(selStart,
              textInfoPtr->selectLast + 1 - textInfoPtr->selectFirst);
      byteCount = selEnd - selStart - offset;
      if (byteCount > maxBytes) {
          byteCount = maxBytes;
      }
      if (byteCount <= 0) {
          return 0;
      }
      memcpy(buffer, selStart + offset, (size_t) byteCount);
      buffer[byteCount] = '\0';
      return byteCount;
  }
  /*
   *--------------------------------------------------------------
   *
   * TextToPostscript --
   *
   *      This procedure is called to generate Postscript for
   *      text items.
   *
   * Results:
   *      The return value is a standard Tcl result.  If an error
   *      occurs in generating Postscript then an error message is
   *      left in the interp's result, replacing whatever used
   *      to be there.  If no error occurs, then Postscript for the
   *      item is appended to the result.
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
  static int
  TextToPostscript(interp, canvas, itemPtr, prepass)
      Tcl_Interp *interp;         /* Leave Postscript or error message here. */
      Tk_Canvas canvas;           /* Information about overall canvas. */
      Tk_Item *itemPtr;           /* Item for which Postscript is wanted. */
      int prepass;                /* 1 means this is a prepass to collect
                                   * font information; 0 means final Postscript
                                   * is being created. */
  {
      TextItem *textPtr = (TextItem *) itemPtr;
      int x, y;
      Tk_FontMetrics fm;
      char *justify;
      char buffer[500];
      XColor *color;
      Pixmap stipple;
      Tk_State state = itemPtr->state;
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      color = textPtr->color;
      stipple = textPtr->stipple;
      if (state == TK_STATE_HIDDEN || textPtr->color == NULL ||
              textPtr->text == NULL || *textPtr->text == 0) {
          return TCL_OK;
      } else if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
          if (textPtr->activeColor!=NULL) {
              color = textPtr->activeColor;
          }
          if (textPtr->activeStipple!=None) {
              stipple = textPtr->activeStipple;
          }
      } else if (state==TK_STATE_DISABLED) {
          if (textPtr->disabledColor!=NULL) {
              color = textPtr->disabledColor;
          }
          if (textPtr->disabledStipple!=None) {
              stipple = textPtr->disabledStipple;
          }
      }
      if (Tk_CanvasPsFont(interp, canvas, textPtr->tkfont) != TCL_OK) {
          return TCL_ERROR;
      }
      if (prepass != 0) {
          return TCL_OK;
      }
      if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) {
          return TCL_ERROR;
      }
      if (stipple != None) {
          Tcl_AppendResult(interp, "/StippleText {\n    ",
                  (char *) NULL);
          Tk_CanvasPsStipple(interp, canvas, stipple);
          Tcl_AppendResult(interp, "} bind def\n", (char *) NULL);
      }
      sprintf(buffer, "%.15g %.15g [\n", textPtr->x,
              Tk_CanvasPsY(canvas, textPtr->y));
      Tcl_AppendResult(interp, buffer, (char *) NULL);
      Tk_TextLayoutToPostscript(interp, textPtr->textLayout);
      x = 0;  y = 0;  justify = NULL;     /* lint. */
      switch (textPtr->anchor) {
          case TK_ANCHOR_NW:      x = 0; y = 0;   break;
          case TK_ANCHOR_N:       x = 1; y = 0;   break;
          case TK_ANCHOR_NE:      x = 2; y = 0;   break;
          case TK_ANCHOR_E:       x = 2; y = 1;   break;
          case TK_ANCHOR_SE:      x = 2; y = 2;   break;
          case TK_ANCHOR_S:       x = 1; y = 2;   break;
          case TK_ANCHOR_SW:      x = 0; y = 2;   break;
          case TK_ANCHOR_W:       x = 0; y = 1;   break;
          case TK_ANCHOR_CENTER:  x = 1; y = 1;   break;
      }
      switch (textPtr->justify) {
          case TK_JUSTIFY_LEFT:   justify = "0";  break;
          case TK_JUSTIFY_CENTER: justify = "0.5";break;
          case TK_JUSTIFY_RIGHT:  justify = "1";  break;
      }
      Tk_GetFontMetrics(textPtr->tkfont, &fm);
      sprintf(buffer, "] %d %g %g %s %s DrawText\n",
              fm.linespace, x / -2.0, y / 2.0, justify,
              ((stipple == None) ? "false" : "true"));
      Tcl_AppendResult(interp, buffer, (char *) NULL);
      return TCL_OK;
  }
  /* $Header$ */
  /* End of tkcanvtext.c */

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