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Diffstat (limited to 'generic/tkCanvBmap.c')
| -rw-r--r-- | generic/tkCanvBmap.c | 800 |
1 files changed, 800 insertions, 0 deletions
diff --git a/generic/tkCanvBmap.c b/generic/tkCanvBmap.c new file mode 100644 index 0000000..fff0638 --- /dev/null +++ b/generic/tkCanvBmap.c @@ -0,0 +1,800 @@ +/* + * 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. + * + * SCCS: @(#) tkCanvBmap.c 1.30 96/05/03 10:49:00 + */ + +#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 CreateBitmap _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 */ + CreateBitmap, /* 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 */ +}; + +/* + *-------------------------------------------------------------- + * + * 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 + * 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 +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. */ + 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_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->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; +} |