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

Diff of /projs/dtats/trunk/shared_source/c_tk_base_7_5_w_mods/tkcanvimg.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
  /* $Header$ */
  /*
   * tkCanvImg.c --
   *
   *      This file implements image items for canvas widgets.
   *
   * Copyright (c) 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: tkcanvimg.c,v 1.1.1.1 2001/06/13 04:56:24 dtashley Exp $
   */
  #include <stdio.h>
  #include "tkInt.h"
  #include "tkPort.h"
  #include "tkCanvas.h"
  /*
   * The structure below defines the record for each image item.
   */
  typedef struct ImageItem  {
      Tk_Item header;             /* Generic stuff that's the same for all
                                   * types.  MUST BE FIRST IN STRUCTURE. */
      Tk_Canvas canvas;           /* Canvas containing the image. */
      double x, y;                /* Coordinates of positioning point for
                                   * image. */
      Tk_Anchor anchor;           /* Where to anchor image relative to
                                   * (x,y). */
      char *imageString;          /* String describing -image option (malloc-ed).
                                   * NULL means no image right now. */
      char *activeImageString;    /* String describing -activeimage option.
                                   * NULL means no image right now. */
      char *disabledImageString;  /* String describing -disabledimage option.
                                   * NULL means no image right now. */
      Tk_Image image;             /* Image to display in window, or NULL if
                                   * no image at present. */
      Tk_Image activeImage;       /* Image to display in window, or NULL if
                                   * no image at present. */
      Tk_Image disabledImage;     /* Image to display in window, or NULL if
                                   * no image at present. */
  } ImageItem;
  /*
   * 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_STRING, "-activeimage", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(ImageItem, activeImageString),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
          "center", Tk_Offset(ImageItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_STRING, "-disabledimage", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(ImageItem, disabledImageString),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_STRING, "-image", (char *) NULL, (char *) NULL,
          (char *) NULL, Tk_Offset(ImageItem, imageString), TK_CONFIG_NULL_OK},
      {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 void             ImageChangedProc _ANSI_ARGS_((ClientData clientData,
                              int x, int y, int width, int height, int imgWidth,
                              int imgHeight));
  static int              ImageCoords _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
                              Tcl_Obj *CONST argv[]));
  static int              ImageToArea _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double *rectPtr));
  static double           ImageToPoint _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double *coordPtr));
  static int              ImageToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
  static void             ComputeImageBbox _ANSI_ARGS_((Tk_Canvas canvas,
                              ImageItem *imgPtr));
  static int              ConfigureImage _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
                              Tcl_Obj *CONST argv[], int flags));
  static int              CreateImage _ANSI_ARGS_((Tcl_Interp *interp,
                              Tk_Canvas canvas, struct Tk_Item *itemPtr,
                              int argc, Tcl_Obj *CONST argv[]));
  static void             DeleteImage _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, Display *display));
  static void             DisplayImage _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, Display *display, Drawable dst,
                              int x, int y, int width, int height));
  static void             ScaleImage _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double originX, double originY,
                              double scaleX, double scaleY));
  static void             TranslateImage _ANSI_ARGS_((Tk_Canvas canvas,
                              Tk_Item *itemPtr, double deltaX, double deltaY));
  /*
   * The structures below defines the image item type in terms of
   * procedures that can be invoked by generic item code.
   */
  Tk_ItemType tkImageType = {
      "image",                            /* name */
      sizeof(ImageItem),                  /* itemSize */
      CreateImage,                        /* createProc */
      configSpecs,                        /* configSpecs */
      ConfigureImage,                     /* configureProc */
      ImageCoords,                        /* coordProc */
      DeleteImage,                        /* deleteProc */
      DisplayImage,                       /* displayProc */
      TK_CONFIG_OBJS,                     /* flags */
      ImageToPoint,                       /* pointProc */
      ImageToArea,                        /* areaProc */
      ImageToPostscript,                  /* postscriptProc */
      ScaleImage,                         /* scaleProc */
      TranslateImage,                     /* 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 */
  };
  /*
   *--------------------------------------------------------------
   *
   * CreateImage --
   *
   *      This procedure is invoked to create a new image
   *      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 image item is created.
   *
   *--------------------------------------------------------------
   */
  static int
  CreateImage(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. */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      int i;
      if (argc==1) {
          i = 1;
      } else {
          char *arg = Tcl_GetStringFromObj((Tcl_Obj *) 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.
       */
      imgPtr->canvas = canvas;
      imgPtr->anchor = TK_ANCHOR_CENTER;
      imgPtr->imageString = NULL;
      imgPtr->activeImageString = NULL;
      imgPtr->disabledImageString = NULL;
      imgPtr->image = NULL;
      imgPtr->activeImage = NULL;
      imgPtr->disabledImage = NULL;
      /*
       * Process the arguments to fill in the item record.
       */
      if ((ImageCoords(interp, canvas, itemPtr, i, argv) != TCL_OK)) {
          goto error;
      }
      if (ConfigureImage(interp, canvas, itemPtr, argc-i, argv+i, 0) == TCL_OK) {
          return TCL_OK;
      }
      error:
      DeleteImage(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
      return TCL_ERROR;
  }
  /*
   *--------------------------------------------------------------
   *
   * ImageCoords --
   *
   *      This procedure is invoked to process the "coords" widget
   *      command on image 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
  ImageCoords(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, ... */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      if (argc == 0) {
          Tcl_Obj *obj = Tcl_NewObj();
          Tcl_Obj *subobj = Tcl_NewDoubleObj(imgPtr->x);
          Tcl_ListObjAppendElement(interp, obj, subobj);
          subobj = Tcl_NewDoubleObj(imgPtr->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];
                  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], &imgPtr->x) != TCL_OK)
                  || (Tk_CanvasGetCoordFromObj(interp, canvas, argv[1],
                      &imgPtr->y) != TCL_OK)) {
              return TCL_ERROR;
          }
          ComputeImageBbox(canvas, imgPtr);
      } else {
          char buf[64];
          sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", argc);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
          return TCL_ERROR;
      }
      return TCL_OK;
  }
  /*
   *--------------------------------------------------------------
   *
   * ConfigureImage --
   *
   *      This procedure is invoked to configure various aspects
   *      of an image 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
  ConfigureImage(interp, canvas, itemPtr, argc, argv, flags)
      Tcl_Interp *interp;         /* Used for error reporting. */
      Tk_Canvas canvas;           /* Canvas containing itemPtr. */
      Tk_Item *itemPtr;           /* Image 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. */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      Tk_Window tkwin;
      Tk_Image image;
      tkwin = Tk_CanvasTkwin(canvas);
      if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, (char **) argv,
              (char *) imgPtr, flags|TK_CONFIG_OBJS) != TCL_OK) {
          return TCL_ERROR;
      }
      /*
       * Create the image.  Save the old image around and don't free it
       * until after the new one is allocated.  This keeps the reference
       * count from going to zero so the image doesn't have to be recreated
       * if it hasn't changed.
       */
      if (imgPtr->activeImageString != NULL) {
          itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
      } else {
          itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
      }
      if (imgPtr->imageString != NULL) {
          image = Tk_GetImage(interp, tkwin, imgPtr->imageString,
                  ImageChangedProc, (ClientData) imgPtr);
          if (image == NULL) {
              return TCL_ERROR;
          }
      } else {
          image = NULL;
      }
      if (imgPtr->image != NULL) {
          Tk_FreeImage(imgPtr->image);
      }
      imgPtr->image = image;
      if (imgPtr->activeImageString != NULL) {
          image = Tk_GetImage(interp, tkwin, imgPtr->activeImageString,
                  ImageChangedProc, (ClientData) imgPtr);
          if (image == NULL) {
              return TCL_ERROR;
          }
      } else {
          image = NULL;
      }
      if (imgPtr->activeImage != NULL) {
          Tk_FreeImage(imgPtr->activeImage);
      }
      imgPtr->activeImage = image;
      if (imgPtr->disabledImageString != NULL) {
          image = Tk_GetImage(interp, tkwin, imgPtr->disabledImageString,
                  ImageChangedProc, (ClientData) imgPtr);
          if (image == NULL) {
              return TCL_ERROR;
          }
      } else {
          image = NULL;
      }
      if (imgPtr->disabledImage != NULL) {
          Tk_FreeImage(imgPtr->disabledImage);
      }
      imgPtr->disabledImage = image;
      ComputeImageBbox(canvas, imgPtr);
      return TCL_OK;
  }
  /*
   *--------------------------------------------------------------
   *
   * DeleteImage --
   *
   *      This procedure is called to clean up the data structure
   *      associated with a image item.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Resources associated with itemPtr are released.
   *
   *--------------------------------------------------------------
   */
  static void
  DeleteImage(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. */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      if (imgPtr->imageString != NULL) {
          ckfree(imgPtr->imageString);
      }
      if (imgPtr->activeImageString != NULL) {
          ckfree(imgPtr->activeImageString);
      }
      if (imgPtr->disabledImageString != NULL) {
          ckfree(imgPtr->disabledImageString);
      }
      if (imgPtr->image != NULL) {
          Tk_FreeImage(imgPtr->image);
      }
      if (imgPtr->activeImage != NULL) {
          Tk_FreeImage(imgPtr->activeImage);
      }
      if (imgPtr->disabledImage != NULL) {
          Tk_FreeImage(imgPtr->disabledImage);
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * ComputeImageBbox --
   *
   *      This procedure is invoked to compute the bounding box of
   *      all the pixels that may be drawn as part of a image item.
   *      This procedure is where the child image'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
  ComputeImageBbox(canvas, imgPtr)
      Tk_Canvas canvas;                   /* Canvas that contains item. */
      ImageItem *imgPtr;                  /* Item whose bbox is to be
                                           * recomputed. */
  {
      int width, height;
      int x, y;
      Tk_Image image;
      Tk_State state = imgPtr->header.state;
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      image = imgPtr->image;
      if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)imgPtr) {
          if (imgPtr->activeImage != NULL) {
              image = imgPtr->activeImage;
          }
      } else if (state == TK_STATE_DISABLED) {
          if (imgPtr->disabledImage != NULL) {
              image = imgPtr->disabledImage;
          }
      }
      x = (int) (imgPtr->x + ((imgPtr->x >= 0) ? 0.5 : - 0.5));
      y = (int) (imgPtr->y + ((imgPtr->y >= 0) ? 0.5 : - 0.5));
      if ((state == TK_STATE_HIDDEN) || (image == None)) {
          imgPtr->header.x1 = imgPtr->header.x2 = x;
          imgPtr->header.y1 = imgPtr->header.y2 = y;
          return;
      }
      /*
       * Compute location and size of image, using anchor information.
       */
      Tk_SizeOfImage(image, &width, &height);
      switch (imgPtr->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.
       */
      imgPtr->header.x1 = x;
      imgPtr->header.y1 = y;
      imgPtr->header.x2 = x + width;
      imgPtr->header.y2 = y + height;
  }
  /*
   *--------------------------------------------------------------
   *
   * DisplayImage --
   *
   *      This procedure is invoked to draw a image item in a given
   *      drawable.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      ItemPtr is drawn in drawable using the transformation
   *      information in canvas.
   *
   *--------------------------------------------------------------
   */
  static void
  DisplayImage(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). */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      short drawableX, drawableY;
      Tk_Image image;
      Tk_State state = itemPtr->state;
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      image = imgPtr->image;
      if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
          if (imgPtr->activeImage != NULL) {
              image = imgPtr->activeImage;
          }
      } else if (state == TK_STATE_DISABLED) {
          if (imgPtr->disabledImage != NULL) {
              image = imgPtr->disabledImage;
          }
      }
      if (image == NULL) {
          return;
      }
      /*
       * Translate the coordinates to those of the image, then redisplay it.
       */
      Tk_CanvasDrawableCoords(canvas, (double) x, (double) y,
              &drawableX, &drawableY);
      Tk_RedrawImage(image, x - imgPtr->header.x1, y - imgPtr->header.y1,
              width, height, drawable, drawableX, drawableY);
  }
  /*
   *--------------------------------------------------------------
   *
   * ImageToPoint --
   *
   *      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 image.  If the
   *      point isn't inside the image then the return value is the
   *      distance from the point to the image.
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
  static double
  ImageToPoint(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. */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      double x1, x2, y1, y2, xDiff, yDiff;
      x1 = imgPtr->header.x1;
      y1 = imgPtr->header.y1;
      x2 = imgPtr->header.x2;
      y2 = imgPtr->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);
  }
  /*
   *--------------------------------------------------------------
   *
   * ImageToArea --
   *
   *      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
  ImageToArea(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.  */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      if ((rectPtr[2] <= imgPtr->header.x1)
              || (rectPtr[0] >= imgPtr->header.x2)
              || (rectPtr[3] <= imgPtr->header.y1)
              || (rectPtr[1] >= imgPtr->header.y2)) {
          return -1;
      }
      if ((rectPtr[0] <= imgPtr->header.x1)
              && (rectPtr[1] <= imgPtr->header.y1)
              && (rectPtr[2] >= imgPtr->header.x2)
              && (rectPtr[3] >= imgPtr->header.y2)) {
          return 1;
      }
      return 0;
  }
  /*
   *--------------------------------------------------------------
   *
   * ImageToPostscript --
   *
   *      This procedure is called to generate Postscript for
   *      image items.
   *
   * Results:
   *      The return value is a standard Tcl result.  If an error
   *      occurs in generating Postscript then an error message is
   *      left in interp->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
  ImageToPostscript(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.*/
  {
      ImageItem *imgPtr = (ImageItem *)itemPtr;
      Tk_Window canvasWin = Tk_CanvasTkwin(canvas);
      char buffer[256];
      double x, y;
      int width, height;
      Tk_Image image;
      Tk_State state = itemPtr->state;
      if(state == TK_STATE_NULL) {
          state = ((TkCanvas *)canvas)->canvas_state;
      }
      image = imgPtr->image;
      if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
          if (imgPtr->activeImage != NULL) {
              image = imgPtr->activeImage;
          }
      } else if (state == TK_STATE_DISABLED) {
          if (imgPtr->disabledImage != NULL) {
              image = imgPtr->disabledImage;
          }
      }
      Tk_SizeOfImage(image, &width, &height);
      /*
       * Compute the coordinates of the lower-left corner of the image,
       * taking into account the anchor position for the image.
       */
      x = imgPtr->x;
      y = Tk_CanvasPsY(canvas, imgPtr->y);
      switch (imgPtr->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;
      }
      if (image == NULL) {
          return TCL_OK;
      }
      if (!prepass) {
          sprintf(buffer, "%.15g %.15g", x, y);
          Tcl_AppendResult(interp, buffer, " translate\n", (char *) NULL);
      }
      return Tk_PostscriptImage(image, interp, canvasWin,
              ((TkCanvas *) canvas)->psInfo, 0, 0, width, height, prepass);
  }
  /*
   *--------------------------------------------------------------
   *
   * ScaleImage --
   *
   *      This procedure is invoked to rescale an item.
   *
   * 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
  ScaleImage(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. */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      imgPtr->x = originX + scaleX*(imgPtr->x - originX);
      imgPtr->y = originY + scaleY*(imgPtr->y - originY);
      ComputeImageBbox(canvas, imgPtr);
  }
  /*
   *--------------------------------------------------------------
   *
   * TranslateImage --
   *
   *      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
  TranslateImage(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. */
  {
      ImageItem *imgPtr = (ImageItem *) itemPtr;
      imgPtr->x += deltaX;
      imgPtr->y += deltaY;
      ComputeImageBbox(canvas, imgPtr);
  }
  /*
   *----------------------------------------------------------------------
   *
   * ImageChangedProc --
   *
   *      This procedure is invoked by the image code whenever the manager
   *      for an image does something that affects the image's size or
   *      how it is displayed.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Arranges for the canvas to get redisplayed.
   *
   *----------------------------------------------------------------------
   */
  static void
  ImageChangedProc(clientData, x, y, width, height, imgWidth, imgHeight)
      ClientData clientData;              /* Pointer to canvas item for image. */
      int x, y;                           /* Upper left pixel (within image)
                                           * that must be redisplayed. */
      int width, height;                  /* Dimensions of area to redisplay
                                           * (may be <= 0). */
      int imgWidth, imgHeight;            /* New dimensions of image. */
  {
      ImageItem *imgPtr = (ImageItem *) clientData;
      /*
       * If the image's size changed and it's not anchored at its
       * northwest corner then just redisplay the entire area of the
       * image.  This is a bit over-conservative, but we need to do
       * something because a size change also means a position change.
       */
      if (((imgPtr->header.x2 - imgPtr->header.x1) != imgWidth)
              || ((imgPtr->header.y2 - imgPtr->header.y1) != imgHeight)) {
          x = y = 0;
          width = imgWidth;
          height = imgHeight;
          Tk_CanvasEventuallyRedraw(imgPtr->canvas, imgPtr->header.x1,
                  imgPtr->header.y1, imgPtr->header.x2, imgPtr->header.y2);
      }
      ComputeImageBbox(imgPtr->canvas, imgPtr);
      Tk_CanvasEventuallyRedraw(imgPtr->canvas, imgPtr->header.x1 + x,
              imgPtr->header.y1 + y, (int) (imgPtr->header.x1 + x + width),
              (int) (imgPtr->header.y1 + y + height));
  }
  /* End of tkcanvimg.c */

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