/[dtapublic]/projs/dtats/trunk/shared_source/c_tk_base_7_5_w_mods/tkcanvbmap.c

Diff of /projs/dtats/trunk/shared_source/c_tk_base_7_5_w_mods/tkcanvbmap.c

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-revision 69 by dashley,
Sat Nov  5 10:54:17 2016 UTC
+revision 71 by dashley,
Sat Nov  5 11:07:06 2016 UTC
 Line 1
  /* $Header$ */
  /*
   * tkCanvBmap.c --
   *
   *      This file implements bitmap items for canvas widgets.
   *
   * Copyright (c) 1992-1994 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: tkcanvbmap.c,v 1.1.1.1 2001/06/13 04:56:16 dtashley Exp $
   */
  #include <stdio.h>
  #include "tkInt.h"
  #include "tkPort.h"
  #include "tkCanvas.h"
  /*
   * The structure below defines the record for each bitmap item.
   */
  typedef struct BitmapItem  {
      Tk_Item header;             /* Generic stuff that's the same for all
                                   * types.  MUST BE FIRST IN STRUCTURE. */
      double x, y;                /* Coordinates of positioning point for
                                   * bitmap. */
      Tk_Anchor anchor;           /* Where to anchor bitmap relative to
                                   * (x,y). */
      Pixmap bitmap;              /* Bitmap to display in window. */
      Pixmap activeBitmap;        /* Bitmap to display in window. */
      Pixmap disabledBitmap;      /* Bitmap to display in window. */
      XColor *fgColor;            /* Foreground color to use for bitmap. */
      XColor *activeFgColor;      /* Foreground color to use for bitmap. */
      XColor *disabledFgColor;    /* Foreground color to use for bitmap. */
      XColor *bgColor;            /* Background color to use for bitmap. */
      XColor *activeBgColor;      /* Background color to use for bitmap. */
      XColor *disabledBgColor;    /* Background color to use for bitmap. */
      GC gc;                      /* Graphics context to use for drawing
                                   * bitmap on screen. */
  } BitmapItem;
  /*
   * 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_ConfigSpec configSpecs[] = {
      {TK_CONFIG_COLOR, "-activebackground", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, activeBgColor), TK_CONFIG_NULL_OK},
      {TK_CONFIG_BITMAP, "-activebitmap", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, activeBitmap), TK_CONFIG_NULL_OK},
      {TK_CONFIG_COLOR, "-activeforeground", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, activeFgColor), TK_CONFIG_NULL_OK},
      {TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
          "center", Tk_Offset(BitmapItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_COLOR, "-background", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, bgColor), TK_CONFIG_NULL_OK},
      {TK_CONFIG_BITMAP, "-bitmap", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, bitmap), TK_CONFIG_NULL_OK},
      {TK_CONFIG_COLOR, "-disabledbackground", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, disabledBgColor),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_BITMAP, "-disabledbitmap", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, disabledBitmap),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_COLOR, "-disabledforeground", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(BitmapItem, disabledFgColor),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_COLOR, "-foreground", (char *) NULL, (char *) NULL,
          "black", Tk_Offset(BitmapItem, fgColor), 0},
      {TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
          &stateOption},
      {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
          (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
      {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
          (char *) NULL, 0, 0}
  };
  /*
   * Prototypes for procedures defined in this file:
   */
  static int              BitmapCoords _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
                              Tcl_Obj *CONST argv[]));
  static int              BitmapToArea _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double *rectPtr));
  static double           BitmapToPoint _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double *coordPtr));
  static int              BitmapToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
  static void             ComputeBitmapBbox _ANSI_ARGS_((Tk_Canvas canvas,
                              BitmapItem *bmapPtr));
  static int              ConfigureBitmap _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
                              Tcl_Obj *CONST argv[], int flags));
  static int              CreateBitmap _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, struct Tk_Item *itemPtr,
                              int argc, Tcl_Obj *CONST argv[]));
  static void             DeleteBitmap _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, Display *display));
  static void             DisplayBitmap _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, Display *display, Drawable dst,
                              int x, int y, int width, int height));
  static void             ScaleBitmap _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double originX, double originY,
                              double scaleX, double scaleY));
  static void             TranslateBitmap _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double deltaX, double deltaY));
  /*
   * The structures below defines the bitmap item type in terms of
   * procedures that can be invoked by generic item code.
   */
  Tk_ItemType tkBitmapType = {
      "bitmap",                           /* name */
      sizeof(BitmapItem),                 /* itemSize */
      CreateBitmap,                       /* createProc */
      configSpecs,                        /* configSpecs */
      ConfigureBitmap,                    /* configureProc */
      BitmapCoords,                       /* coordProc */
      DeleteBitmap,                       /* deleteProc */
      DisplayBitmap,                      /* displayProc */
      TK_CONFIG_OBJS,                     /* flags */
      BitmapToPoint,                      /* pointProc */
      BitmapToArea,                       /* areaProc */
      BitmapToPostscript,                 /* postscriptProc */
      ScaleBitmap,                        /* scaleProc */
      TranslateBitmap,                    /* translateProc */
      (Tk_ItemIndexProc *) NULL,          /* indexProc */
      (Tk_ItemCursorProc *) NULL,         /* icursorProc */
      (Tk_ItemSelectionProc *) NULL,      /* selectionProc */
      (Tk_ItemInsertProc *) NULL,         /* insertProc */
      (Tk_ItemDCharsProc *) NULL,         /* dTextProc */
      (Tk_ItemType *) NULL,               /* nextPtr */
  };
  /*
   *--------------------------------------------------------------
   *
   * CreateBitmap --
   *
   *      This procedure is invoked to create a new bitmap
   *      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 bitmap item is created.
   *
   *--------------------------------------------------------------
   */
  static int
  CreateBitmap(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. */
  {
      BitmapItem *bmapPtr = (BitmapItem *) 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;
      }
      /*
       * Initialize item's record.
       */
      bmapPtr->anchor = TK_ANCHOR_CENTER;
      bmapPtr->bitmap = None;
      bmapPtr->activeBitmap = None;
      bmapPtr->disabledBitmap = None;
      bmapPtr->fgColor = NULL;
      bmapPtr->activeFgColor = NULL;
      bmapPtr->disabledFgColor = NULL;
      bmapPtr->bgColor = NULL;
      bmapPtr->activeBgColor = NULL;
      bmapPtr->disabledBgColor = NULL;
      bmapPtr->gc = None;
      /*
       * Process the arguments to fill in the item record.
       */
      if ((BitmapCoords(interp, canvas, itemPtr, i, argv) != TCL_OK)) {
          goto error;
      }
      if (ConfigureBitmap(interp, canvas, itemPtr, argc-i, argv+i, 0) == TCL_OK) {
          return TCL_OK;
      }
      error:
      DeleteBitmap(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
      return TCL_ERROR;
  }
  /*
   *--------------------------------------------------------------
   *
   * BitmapCoords --
   *
   *      This procedure is invoked to process the "coords" widget
   *      command on bitmap 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
  BitmapCoords(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, ... */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      if (argc == 0) {
          Tcl_Obj *obj = Tcl_NewObj();
          Tcl_Obj *subobj = Tcl_NewDoubleObj(bmapPtr->x);
          Tcl_ListObjAppendElement(interp, obj, subobj);
          subobj = Tcl_NewDoubleObj(bmapPtr->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], &bmapPtr->x) != TCL_OK)
                  || (Tk_CanvasGetCoordFromObj(interp, canvas, argv[1], &bmapPtr->y)
                      != TCL_OK)) {
              return TCL_ERROR;
          }
          ComputeBitmapBbox(canvas, bmapPtr);
      } 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;
  }
  /*
   *--------------------------------------------------------------
   *
   * ConfigureBitmap --
   *
   *      This procedure is invoked to configure various aspects
   *      of a bitmap item, such as its anchor position.
   *
   * 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 may be set for itemPtr.
   *
   *--------------------------------------------------------------
   */
  static int
  ConfigureBitmap(interp, canvas, itemPtr, argc, argv, flags)
      Tcl_Interp *interp;         /* Used for error reporting. */
      Tk_Canvas canvas;           /* Canvas containing itemPtr. */
      Tk_Item *itemPtr;           /* Bitmap 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. */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      XGCValues gcValues;
      GC newGC;
      Tk_Window tkwin;
      unsigned long mask;
      XColor *fgColor;
      XColor *bgColor;
      Pixmap bitmap;
      Tk_State state;
      tkwin = Tk_CanvasTkwin(canvas);
      if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, (char **) argv,
              (char *) bmapPtr, flags|TK_CONFIG_OBJS) != TCL_OK) {
          return TCL_ERROR;
      }
      /*
       * A few of the options require additional processing, such as those
       * that determine the graphics context.
       */
      state = itemPtr->state;
      if (bmapPtr->activeFgColor!=NULL ||
              bmapPtr->activeBgColor!=NULL ||
              bmapPtr->activeBitmap!=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;
      }
      if (state==TK_STATE_HIDDEN) {
          ComputeBitmapBbox(canvas, bmapPtr);
          return TCL_OK;
      }
      fgColor = bmapPtr->fgColor;
      bgColor = bmapPtr->bgColor;
      bitmap = bmapPtr->bitmap;
      if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
          if (bmapPtr->activeFgColor!=NULL) {
              fgColor = bmapPtr->activeFgColor;
          }
          if (bmapPtr->activeBgColor!=NULL) {
              bgColor = bmapPtr->activeBgColor;
          }
          if (bmapPtr->activeBitmap!=None) {
              bitmap = bmapPtr->activeBitmap;
          }
      } else if (state==TK_STATE_DISABLED) {
          if (bmapPtr->disabledFgColor!=NULL) {
              fgColor = bmapPtr->disabledFgColor;
          }
          if (bmapPtr->disabledBgColor!=NULL) {
              bgColor = bmapPtr->disabledBgColor;
          }
          if (bmapPtr->disabledBitmap!=None) {
              bitmap = bmapPtr->disabledBitmap;
          }
      }
      if (state==TK_STATE_DISABLED || bitmap == None) {
          ComputeBitmapBbox(canvas, bmapPtr);
          return TCL_OK;
      }
      gcValues.foreground = fgColor->pixel;
      mask = GCForeground;
      if (bgColor != NULL) {
          gcValues.background = bgColor->pixel;
          mask |= GCBackground;
      } else {
          gcValues.clip_mask = bitmap;
          mask |= GCClipMask;
      }
      if (bitmap == None) {
          newGC = None;
      } else {
          newGC = Tk_GetGC(tkwin, mask, &gcValues);
      }
      if (bmapPtr->gc != None) {
          Tk_FreeGC(Tk_Display(tkwin), bmapPtr->gc);
      }
      bmapPtr->gc = newGC;
      ComputeBitmapBbox(canvas, bmapPtr);
      return TCL_OK;
  }
  /*
   *--------------------------------------------------------------
   *
   * DeleteBitmap --
   *
   *      This procedure is called to clean up the data structure
   *      associated with a bitmap item.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Resources associated with itemPtr are released.
   *
   *--------------------------------------------------------------
   */
  static void
  DeleteBitmap(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. */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      if (bmapPtr->bitmap != None) {
          Tk_FreeBitmap(display, bmapPtr->bitmap);
      }
      if (bmapPtr->activeBitmap != None) {
          Tk_FreeBitmap(display, bmapPtr->activeBitmap);
      }
      if (bmapPtr->disabledBitmap != None) {
          Tk_FreeBitmap(display, bmapPtr->disabledBitmap);
      }
      if (bmapPtr->fgColor != NULL) {
          Tk_FreeColor(bmapPtr->fgColor);
      }
      if (bmapPtr->activeFgColor != NULL) {
          Tk_FreeColor(bmapPtr->activeFgColor);
      }
      if (bmapPtr->disabledFgColor != NULL) {
          Tk_FreeColor(bmapPtr->disabledFgColor);
      }
      if (bmapPtr->bgColor != NULL) {
          Tk_FreeColor(bmapPtr->bgColor);
      }
      if (bmapPtr->activeBgColor != NULL) {
          Tk_FreeColor(bmapPtr->activeBgColor);
      }
      if (bmapPtr->disabledBgColor != NULL) {
          Tk_FreeColor(bmapPtr->disabledBgColor);
      }
      if (bmapPtr->gc != NULL) {
          Tk_FreeGC(display, bmapPtr->gc);
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * ComputeBitmapBbox --
   *
   *      This procedure is invoked to compute the bounding box of
   *      all the pixels that may be drawn as part of a bitmap item.
   *      This procedure is where the child bitmap's placement is
   *      computed.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The fields x1, y1, x2, and y2 are updated in the header
   *      for itemPtr.
   *
   *--------------------------------------------------------------
   */
          /* ARGSUSED */
  static void
  ComputeBitmapBbox(canvas, bmapPtr)
      Tk_Canvas canvas;                   /* Canvas that contains item. */
      BitmapItem *bmapPtr;                /* Item whose bbox is to be
                                           * recomputed. */
  {
      int width, height;
      int x, y;
      Pixmap bitmap;
      Tk_State state = bmapPtr->header.state;
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      bitmap = bmapPtr->bitmap;
      if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)bmapPtr) {
          if (bmapPtr->activeBitmap!=None) {
              bitmap = bmapPtr->activeBitmap;
          }
      } else if (state==TK_STATE_DISABLED) {
          if (bmapPtr->disabledBitmap!=None) {
              bitmap = bmapPtr->disabledBitmap;
          }
      }
      x = (int) (bmapPtr->x + ((bmapPtr->x >= 0) ? 0.5 : - 0.5));
      y = (int) (bmapPtr->y + ((bmapPtr->y >= 0) ? 0.5 : - 0.5));
      if (state==TK_STATE_HIDDEN || bitmap == None) {
          bmapPtr->header.x1 = bmapPtr->header.x2 = x;
          bmapPtr->header.y1 = bmapPtr->header.y2 = y;
          return;
      }
      /*
       * Compute location and size of bitmap, using anchor information.
       */
      Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bmapPtr->bitmap,
              &width, &height);
      switch (bmapPtr->anchor) {
          case TK_ANCHOR_N:
              x -= width/2;
              break;
          case TK_ANCHOR_NE:
              x -= width;
              break;
          case TK_ANCHOR_E:
              x -= width;
              y -= height/2;
              break;
          case TK_ANCHOR_SE:
              x -= width;
              y -= height;
              break;
          case TK_ANCHOR_S:
              x -= width/2;
              y -= height;
              break;
          case TK_ANCHOR_SW:
              y -= height;
              break;
          case TK_ANCHOR_W:
              y -= height/2;
              break;
          case TK_ANCHOR_NW:
              break;
          case TK_ANCHOR_CENTER:
              x -= width/2;
              y -= height/2;
              break;
      }
      /*
       * Store the information in the item header.
       */
      bmapPtr->header.x1 = x;
      bmapPtr->header.y1 = y;
      bmapPtr->header.x2 = x + width;
      bmapPtr->header.y2 = y + height;
  }
  /*
   *--------------------------------------------------------------
   *
   * DisplayBitmap --
   *
   *      This procedure is invoked to draw a bitmap item in a given
   *      drawable.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      ItemPtr is drawn in drawable using the transformation
   *      information in canvas.
   *
   *--------------------------------------------------------------
   */
  static void
  DisplayBitmap(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). */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      int bmapX, bmapY, bmapWidth, bmapHeight;
      short drawableX, drawableY;
      XColor *fgColor;
      XColor *bgColor;
      Pixmap bitmap;
      Tk_State state = itemPtr->state;
      /*
       * If the area being displayed doesn't cover the whole bitmap,
       * then only redisplay the part of the bitmap that needs
       * redisplay.
       */
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      fgColor = bmapPtr->fgColor;
      bgColor = bmapPtr->bgColor;
      bitmap = bmapPtr->bitmap;
      if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
          if (bmapPtr->activeFgColor!=NULL) {
              fgColor = bmapPtr->activeFgColor;
          }
          if (bmapPtr->activeBgColor!=NULL) {
              bgColor = bmapPtr->activeBgColor;
          }
          if (bmapPtr->activeBitmap!=None) {
              bitmap = bmapPtr->activeBitmap;
          }
      } else if (state==TK_STATE_DISABLED) {
          if (bmapPtr->disabledFgColor!=NULL) {
              fgColor = bmapPtr->disabledFgColor;
          }
          if (bmapPtr->disabledBgColor!=NULL) {
              bgColor = bmapPtr->disabledBgColor;
          }
          if (bmapPtr->disabledBitmap!=None) {
              bitmap = bmapPtr->disabledBitmap;
          }
      }
      if (bitmap != None) {
          if (x > bmapPtr->header.x1) {
              bmapX = x - bmapPtr->header.x1;
              bmapWidth = bmapPtr->header.x2 - x;
          } else {
              bmapX = 0;
              if ((x+width) < bmapPtr->header.x2) {
                  bmapWidth = x + width - bmapPtr->header.x1;
              } else {
                  bmapWidth = bmapPtr->header.x2 - bmapPtr->header.x1;
              }
          }
          if (y > bmapPtr->header.y1) {
              bmapY = y - bmapPtr->header.y1;
              bmapHeight = bmapPtr->header.y2 - y;
          } else {
              bmapY = 0;
              if ((y+height) < bmapPtr->header.y2) {
                  bmapHeight = y + height - bmapPtr->header.y1;
              } else {
                  bmapHeight = bmapPtr->header.y2 - bmapPtr->header.y1;
              }
          }
          Tk_CanvasDrawableCoords(canvas,
                  (double) (bmapPtr->header.x1 + bmapX),
                  (double) (bmapPtr->header.y1 + bmapY),
                  &drawableX, &drawableY);
          /*
           * Must modify the mask origin within the graphics context
           * to line up with the bitmap's origin (in order to make
           * bitmaps with "-background {}" work right).
           */
          XSetClipOrigin(display, bmapPtr->gc, drawableX - bmapX,
                  drawableY - bmapY);
          XCopyPlane(display, bitmap, drawable,
                  bmapPtr->gc, bmapX, bmapY, (unsigned int) bmapWidth,
                  (unsigned int) bmapHeight, drawableX, drawableY, 1);
          XSetClipOrigin(display, bmapPtr->gc, 0, 0);
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * BitmapToPoint --
   *
   *      Computes the distance from a given point to a given
   *      rectangle, in canvas units.
   *
   * Results:
   *      The return value is 0 if the point whose x and y coordinates
   *      are coordPtr[0] and coordPtr[1] is inside the bitmap.  If the
   *      point isn't inside the bitmap then the return value is the
   *      distance from the point to the bitmap.
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
          /* ARGSUSED */
  static double
  BitmapToPoint(canvas, itemPtr, coordPtr)
      Tk_Canvas canvas;           /* Canvas containing item. */
      Tk_Item *itemPtr;           /* Item to check against point. */
      double *coordPtr;           /* Pointer to x and y coordinates. */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      double x1, x2, y1, y2, xDiff, yDiff;
      x1 = bmapPtr->header.x1;
      y1 = bmapPtr->header.y1;
      x2 = bmapPtr->header.x2;
      y2 = bmapPtr->header.y2;
      /*
       * Point is outside rectangle.
       */
      if (coordPtr[0] < x1) {
          xDiff = x1 - coordPtr[0];
      } else if (coordPtr[0] > x2)  {
          xDiff = coordPtr[0] - x2;
      } else {
          xDiff = 0;
      }
      if (coordPtr[1] < y1) {
          yDiff = y1 - coordPtr[1];
      } else if (coordPtr[1] > y2)  {
          yDiff = coordPtr[1] - y2;
      } else {
          yDiff = 0;
      }
      return hypot(xDiff, yDiff);
  }
  /*
   *--------------------------------------------------------------
   *
   * BitmapToArea --
   *
   *      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.
   *
   *--------------------------------------------------------------
   */
          /* ARGSUSED */
  static int
  BitmapToArea(canvas, itemPtr, rectPtr)
      Tk_Canvas canvas;           /* Canvas containing item. */
      Tk_Item *itemPtr;           /* Item to check against rectangle. */
      double *rectPtr;            /* Pointer to array of four coordinates
                                   * (x1, y1, x2, y2) describing rectangular
                                   * area.  */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      if ((rectPtr[2] <= bmapPtr->header.x1)
              || (rectPtr[0] >= bmapPtr->header.x2)
              || (rectPtr[3] <= bmapPtr->header.y1)
              || (rectPtr[1] >= bmapPtr->header.y2)) {
          return -1;
      }
      if ((rectPtr[0] <= bmapPtr->header.x1)
              && (rectPtr[1] <= bmapPtr->header.y1)
              && (rectPtr[2] >= bmapPtr->header.x2)
              && (rectPtr[3] >= bmapPtr->header.y2)) {
          return 1;
      }
      return 0;
  }
  /*
   *--------------------------------------------------------------
   *
   * ScaleBitmap --
   *
   *      This procedure is invoked to rescale a bitmap item in a
   *      canvas.  It is one of the standard item procedures for
   *      bitmap items, and is invoked by the generic canvas code.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The item referred to by itemPtr is rescaled so that the
   *      following transformation is applied to all point coordinates:
   *              x' = originX + scaleX*(x-originX)
   *              y' = originY + scaleY*(y-originY)
   *
   *--------------------------------------------------------------
   */
  static void
  ScaleBitmap(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 item. */
      double scaleX;                      /* Amount to scale in X direction. */
      double scaleY;                      /* Amount to scale in Y direction. */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      bmapPtr->x = originX + scaleX*(bmapPtr->x - originX);
      bmapPtr->y = originY + scaleY*(bmapPtr->y - originY);
      ComputeBitmapBbox(canvas, bmapPtr);
  }
  /*
   *--------------------------------------------------------------
   *
   * TranslateBitmap --
   *
   *      This procedure is called to move an item by a given amount.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The position of the item is offset by (xDelta, yDelta), and
   *      the bounding box is updated in the generic part of the item
   *      structure.
   *
   *--------------------------------------------------------------
   */
  static void
  TranslateBitmap(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. */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      bmapPtr->x += deltaX;
      bmapPtr->y += deltaY;
      ComputeBitmapBbox(canvas, bmapPtr);
  }
  /*
   *--------------------------------------------------------------
   *
   * BitmapToPostscript --
   *
   *      This procedure is called to generate Postscript for
   *      bitmap 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
  BitmapToPostscript(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. */
  {
      BitmapItem *bmapPtr = (BitmapItem *) itemPtr;
      double x, y;
      int width, height, rowsAtOnce, rowsThisTime;
      int curRow;
      char buffer[100 + TCL_DOUBLE_SPACE * 2 + TCL_INTEGER_SPACE * 4];
      if (bmapPtr->bitmap == None) {
          return TCL_OK;
      }
      /*
       * Compute the coordinates of the lower-left corner of the bitmap,
       * taking into account the anchor position for the bitmp.
       */
      x = bmapPtr->x;
      y = Tk_CanvasPsY(canvas, bmapPtr->y);
      Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bmapPtr->bitmap,
              &width, &height);
      switch (bmapPtr->anchor) {
          case TK_ANCHOR_NW:                      y -= height;            break;
          case TK_ANCHOR_N:       x -= width/2.0; y -= height;            break;
          case TK_ANCHOR_NE:      x -= width;     y -= height;            break;
          case TK_ANCHOR_E:       x -= width;     y -= height/2.0;        break;
          case TK_ANCHOR_SE:      x -= width;                             break;
          case TK_ANCHOR_S:       x -= width/2.0;                         break;
          case TK_ANCHOR_SW:                                              break;
          case TK_ANCHOR_W:                       y -= height/2.0;        break;
          case TK_ANCHOR_CENTER:  x -= width/2.0; y -= height/2.0;        break;
      }
      /*
       * Color the background, if there is one.
       */
      if (bmapPtr->bgColor != NULL) {
          sprintf(buffer,
                  "%.15g %.15g moveto %d 0 rlineto 0 %d rlineto %d %s\n",
                  x, y, width, height, -width, "0 rlineto closepath");
          Tcl_AppendResult(interp, buffer, (char *) NULL);
          if (Tk_CanvasPsColor(interp, canvas, bmapPtr->bgColor) != TCL_OK) {
              return TCL_ERROR;
          }
          Tcl_AppendResult(interp, "fill\n", (char *) NULL);
      }
      /*
       * Draw the bitmap, if there is a foreground color.  If the bitmap
       * is very large, then chop it up into multiple bitmaps, each
       * consisting of one or more rows.  This is needed because Postscript
       * can't handle single strings longer than 64 KBytes long.
       */
      if (bmapPtr->fgColor != NULL) {
          if (Tk_CanvasPsColor(interp, canvas, bmapPtr->fgColor) != TCL_OK) {
              return TCL_ERROR;
          }
          if (width > 60000) {
              Tcl_ResetResult(interp);
              Tcl_AppendResult(interp, "can't generate Postscript",
                      " for bitmaps more than 60000 pixels wide",
                      (char *) NULL);
              return TCL_ERROR;
          }
          rowsAtOnce = 60000/width;
          if (rowsAtOnce < 1) {
              rowsAtOnce = 1;
          }
          sprintf(buffer, "%.15g %.15g translate\n", x, y+height);
          Tcl_AppendResult(interp, buffer, (char *) NULL);
          for (curRow = 0; curRow < height; curRow += rowsAtOnce) {
              rowsThisTime = rowsAtOnce;
              if (rowsThisTime > (height - curRow)) {
                  rowsThisTime = height - curRow;
              }
              sprintf(buffer, "0 -%.15g translate\n%d %d true matrix {\n",
                      (double) rowsThisTime, width, rowsThisTime);
              Tcl_AppendResult(interp, buffer, (char *) NULL);
              if (Tk_CanvasPsBitmap(interp, canvas, bmapPtr->bitmap,
 , curRow, width, rowsThisTime) != TCL_OK) {
                  return TCL_ERROR;
              }
              Tcl_AppendResult(interp, "\n} imagemask\n", (char *) NULL);
          }
      }
      return TCL_OK;
  }
  /* End of tkcanvbmap.c */

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