tkcanvbmap.c

linux系统下的音频通信

/* 
 * 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;