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[/] [or1k/] [tags/] [start/] [insight/] [tk/] [generic/] [tkCanvBmap.c] - Rev 1765
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/* * tkCanvBmap.c -- * * This file implements bitmap items for canvas widgets. * * Copyright (c) 1992-1994 The Regents of the University of California. * Copyright (c) 1994-1995 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 2002-01-16 10:25:50 markom 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. */ XColor *fgColor; /* Foreground color to use for bitmap. */ XColor *bgColor; /* 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 tagsOption = {Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, (ClientData) NULL }; static Tk_ConfigSpec configSpecs[] = { {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, "-foreground", (char *) NULL, (char *) NULL, "black", Tk_Offset(BitmapItem, fgColor), 0}, {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, char **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, char **argv, int flags)); static int tkCreateBitmap _ANSI_ARGS_((Tcl_Interp *interp, Tk_Canvas canvas, struct Tk_Item *itemPtr, int argc, char **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 */ tkCreateBitmap, /* createProc */ configSpecs, /* configSpecs */ ConfigureBitmap, /* configureProc */ BitmapCoords, /* coordProc */ DeleteBitmap, /* deleteProc */ DisplayBitmap, /* displayProc */ 0, /* alwaysRedraw */ 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 */ }; /* *-------------------------------------------------------------- * * tkCreateBitmap -- * * 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 * interp->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 tkCreateBitmap(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. */ char **argv; /* Arguments describing rectangle. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; if (argc < 2) { 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->fgColor = NULL; bmapPtr->bgColor = NULL; bmapPtr->gc = None; /* * Process the arguments to fill in the item record. */ if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &bmapPtr->x) != TCL_OK) || (Tk_CanvasGetCoord(interp, canvas, argv[1], &bmapPtr->y) != TCL_OK)) { return TCL_ERROR; } if (ConfigureBitmap(interp, canvas, itemPtr, argc-2, argv+2, 0) != TCL_OK) { DeleteBitmap(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas))); return TCL_ERROR; } return TCL_OK; } /* *-------------------------------------------------------------- * * 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 interp->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. */ char **argv; /* Array of coordinates: x1, y1, * x2, y2, ... */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; char x[TCL_DOUBLE_SPACE], y[TCL_DOUBLE_SPACE]; if (argc == 0) { Tcl_PrintDouble(interp, bmapPtr->x, x); Tcl_PrintDouble(interp, bmapPtr->y, y); Tcl_AppendResult(interp, x, " ", y, (char *) NULL); } else if (argc == 2) { if ((Tk_CanvasGetCoord(interp, canvas, argv[0], &bmapPtr->x) != TCL_OK) || (Tk_CanvasGetCoord(interp, canvas, argv[1], &bmapPtr->y) != TCL_OK)) { return TCL_ERROR; } ComputeBitmapBbox(canvas, bmapPtr); } else { sprintf(interp->result, "wrong # coordinates: expected 0 or 2, got %d", argc); 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 interp->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. */ char **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; tkwin = Tk_CanvasTkwin(canvas); if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv, (char *) bmapPtr, flags) != TCL_OK) { return TCL_ERROR; } /* * A few of the options require additional processing, such as those * that determine the graphics context. */ gcValues.foreground = bmapPtr->fgColor->pixel; mask = GCForeground; if (bmapPtr->bgColor != NULL) { gcValues.background = bmapPtr->bgColor->pixel; mask |= GCBackground; } else { gcValues.clip_mask = bmapPtr->bitmap; mask |= GCClipMask; } newGC = Tk_GetGCColor(tkwin, mask, &gcValues, bmapPtr->fgColor, bmapPtr->bgColor); 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->fgColor != NULL) { Tk_FreeColor(bmapPtr->fgColor); } if (bmapPtr->bgColor != NULL) { Tk_FreeColor(bmapPtr->bgColor); } 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; x = (int) (bmapPtr->x + ((bmapPtr->x >= 0) ? 0.5 : - 0.5)); y = (int) (bmapPtr->y + ((bmapPtr->y >= 0) ? 0.5 : - 0.5)); if (bmapPtr->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; /* * If the area being displayed doesn't cover the whole bitmap, * then only redisplay the part of the bitmap that needs * redisplay. */ if (bmapPtr->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, bmapPtr->bitmap, drawable, bmapPtr->gc, bmapX, bmapY, (unsigned int) bmapWidth, (unsigned int) bmapHeight, drawableX, drawableY, 1); } } /* *-------------------------------------------------------------- * * 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 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 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[200]; 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, 0, curRow, width, rowsThisTime) != TCL_OK) { return TCL_ERROR; } Tcl_AppendResult(interp, "\n} imagemask\n", (char *) NULL); } } return TCL_OK; }