tkwincolor.c

linux系统下的音频通信

/* 
 * tkWinColor.c --
 *
 *	Functions to map color names to system color values.
 *
 * Copyright (c) 1995 Sun Microsystems, Inc.
 * Copyright (c) 1994 Software Research Associates, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * SCCS: @(#) tkWinColor.c 1.20 97/10/27 16:39:23
 */

#include <tkColor.h>
#include <tkWinInt.h>

/*
 * The following structure is used to keep track of each color that is
 * allocated by this module.
 */

typedef struct WinColor {
    TkColor info;		/* Generic color information. */
    int index;			/* Index for GetSysColor(), -1 if color
				 * is not a "live" system color. */
} WinColor;

/*
 * colorTable is a hash table used to look up X colors by name.
 */

static Tcl_HashTable colorTable;

/*
 * The sysColors array contains the names and index values for the
 * Windows indirect system color names.  In use, all of the names
 * will have the string "System" prepended, but we omit it in the table
 * to save space.
 */

typedef struct {
    char *name;
    int index;
} SystemColorEntry;


static SystemColorEntry sysColors[] = {
    "3dDarkShadow",		COLOR_3DDKSHADOW,
    "3dLight",			COLOR_3DLIGHT,
    "ActiveBorder",		COLOR_ACTIVEBORDER,
    "ActiveCaption",		COLOR_ACTIVECAPTION,
    "AppWorkspace",		COLOR_APPWORKSPACE,
    "Background",		COLOR_BACKGROUND,
    "ButtonFace",		COLOR_BTNFACE,
    "ButtonHighlight",		COLOR_BTNHIGHLIGHT,
    "ButtonShadow",		COLOR_BTNSHADOW,
    "ButtonText",		COLOR_BTNTEXT,
    "CaptionText",		COLOR_CAPTIONTEXT,
    "DisabledText",		COLOR_GRAYTEXT,
    "GrayText",			COLOR_GRAYTEXT,
    "Highlight",		COLOR_HIGHLIGHT,
    "HighlightText",		COLOR_HIGHLIGHTTEXT,
    "InactiveBorder",		COLOR_INACTIVEBORDER,
    "InactiveCaption",		COLOR_INACTIVECAPTION,
    "InactiveCaptionText",	COLOR_INACTIVECAPTIONTEXT,
    "InfoBackground",		COLOR_INFOBK,
    "InfoText",			COLOR_INFOTEXT,
    "Menu",			COLOR_MENU,
    "MenuText",			COLOR_MENUTEXT,
    "Scrollbar",		COLOR_SCROLLBAR,
    "Window",			COLOR_WINDOW,
    "WindowFrame",		COLOR_WINDOWFRAME,
    "WindowText",		COLOR_WINDOWTEXT,
    NULL,			0
};

static int ncolors = 0;

/*
 * Forward declarations for functions defined later in this file.
 */

static int	FindSystemColor _ANSI_ARGS_((const char *name,
		    XColor *colorPtr, int *indexPtr));
static int	GetColorByName _ANSI_ARGS_((char *name, XColor *color));
static int	GetColorByValue _ANSI_ARGS_((char *value, XColor *color));

/*
 *----------------------------------------------------------------------
 *
 * FindSystemColor --
 *
 *	This routine finds the color entry that corresponds to the
 *	specified color.
 *
 * Results:
 *	Returns non-zero on success.  The RGB values of the XColor
 *	will be initialized to the proper values on success.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
FindSystemColor(name, colorPtr, indexPtr)
    const char *name;		/* Color name. */
    XColor *colorPtr;		/* Where to store results. */
    int *indexPtr;		/* Out parameter to store color index. */
{
    int l, u, r, i;

    /*
     * Count the number of elements in the color array if we haven't
     * done so yet.
     */

    if (ncolors == 0) {
	SystemColorEntry *ePtr;
	int version;

	version = LOBYTE(LOWORD(GetVersion()));
	for (ePtr = sysColors; ePtr->name != NULL; ePtr++) {
	    if (version < 4) {
		if (ePtr->index == COLOR_3DDKSHADOW) {
		    ePtr->index = COLOR_BTNSHADOW;
		} else if (ePtr->index == COLOR_3DLIGHT) {
		    ePtr->index = COLOR_BTNHIGHLIGHT;
		}
	    }
	    ncolors++;
	}
    }

    /*
     * Perform a binary search on the sorted array of colors.
     */

    l = 0;
    u = ncolors - 1;
    while (l <= u) {
	i = (l + u) / 2;
	r = strcasecmp(name, sysColors[i].name);
	if (r == 0) {
	    break;
	} else if (r < 0) {
	    u = i-1;
	} else {
	    l = i+1;
	}
    }
    if (l > u) {
	return 0;
    }

    *indexPtr = sysColors[i].index;
    colorPtr->pixel = GetSysColor(sysColors[i].index);
    colorPtr->red = GetRValue(colorPtr->pixel) << 8;
    colorPtr->green = GetGValue(colorPtr->pixel) << 8;
    colorPtr->blue = GetBValue(colorPtr->pixel) << 8;
    colorPtr->flags = DoRed|DoGreen|DoBlue;
    colorPtr->pad = 0;
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpGetColor --
 *
 *	Allocate a new TkColor for the color with the given name.
 *
 * Results:
 *	Returns a newly allocated TkColor, or NULL on failure.
 *
 * Side effects:
 *	May invalidate the colormap cache associated with tkwin upon
 *	allocating a new colormap entry.  Allocates a new TkColor
 *	structure.
 *
 *----------------------------------------------------------------------
 */

TkColor *
TkpGetColor(tkwin, name)
    Tk_Window tkwin;		/* Window in which color will be used. */
    Tk_Uid name;		/* Name of color to allocated (in form
				 * suitable for passing to XParseColor). */
{
    WinColor *winColPtr;
    XColor color;
    int index = -1;		/* -1 indicates that this is not an indirect
				 * sytem color. */

    /*
     * Check to see if it is a system color or an X color string.  If the
     * color is found, allocate a new WinColor and store the XColor and the
     * system color index.
     */

    if (((strncasecmp(name, "system", 6) == 0)
	    && FindSystemColor(name+6, &color, &index))
	    || XParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin), name,
		    &color)) {
	winColPtr = (WinColor *) ckalloc(sizeof(WinColor));
	winColPtr->info.color = color;
	winColPtr->index = index;

	XAllocColor(Tk_Display(tkwin), Tk_Colormap(tkwin),
		&winColPtr->info.color);
 	return (TkColor *) winColPtr; 
    }
    return (TkColor *) NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpGetColorByValue --
 *
 *	Given a desired set of red-green-blue intensities for a color,
 *	locate a pixel value to use to draw that color in a given
 *	window.
 *
 * Results:
 *	The return value is a pointer to an TkColor structure that
 *	indicates the closest red, blue, and green intensities available
 *	to those specified in colorPtr, and also specifies a pixel
 *	value to use to draw in that color.
 *
 * Side effects:
 *	May invalidate the colormap cache for the specified window.
 *	Allocates a new TkColor structure.
 *
 *----------------------------------------------------------------------
 */

TkColor *
TkpGetColorByValue(tkwin, colorPtr)
    Tk_Window tkwin;		/* Window in which color will be used. */
    XColor *colorPtr;		/* Red, green, and blue fields indicate
				 * desired color. */
{
    WinColor *tkColPtr = (WinColor *) ckalloc(sizeof(WinColor));

    tkColPtr->info.color.red = colorPtr->red;
    tkColPtr->info.color.green = colorPtr->green;
    tkColPtr->info.color.blue = colorPtr->blue;
    tkColPtr->info.color.pixel = 0;
    tkColPtr->index = -1;
    XAllocColor(Tk_Display(tkwin), Tk_Colormap(tkwin), &tkColPtr->info.color);
    return (TkColor *) tkColPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpFreeColor --
 *
 *	Release the specified color back to the system.
 *
 * Results:
 *	None
 *
 * Side effects:
 *	Invalidates the colormap cache for the colormap associated with
 *	the given color.
 *
 *----------------------------------------------------------------------
 */

void
TkpFreeColor(tkColPtr)
    TkColor *tkColPtr;		/* Color to be released.  Must have been
				 * allocated by TkpGetColor or
				 * TkpGetColorByValue. */
{
    Screen *screen = tkColPtr->screen;

    XFreeColors(DisplayOfScreen(screen), tkColPtr->colormap,
	    &tkColPtr->color.pixel, 1, 0L);
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinIndexOfColor --
 *
 *	Given a color, return the system color index that was used
 *	to create the color.
 *
 * Results:
 *	If the color was allocated using a system indirect color name,
 *	then the corresponding GetSysColor() index is returned.
 *	Otherwise, -1 is returned.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TkWinIndexOfColor(colorPtr)
    XColor *colorPtr;
{