tkwincolor.c

linux系统下的音频通信

    register WinColor *winColPtr = (WinColor *) colorPtr;
    if (winColPtr->info.magic == COLOR_MAGIC) {
	return winColPtr->index;
    }    
    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * XAllocColor --
 *
 *	Find the closest available color to the specified XColor.
 *
 * Results:
 *	Updates the color argument and returns 1 on success.  Otherwise
 *	returns 0.
 *
 * Side effects:
 *	Allocates a new color in the palette.
 *
 *----------------------------------------------------------------------
 */

int
XAllocColor(display, colormap, color)
    Display* display;
    Colormap colormap;
    XColor* color;
{
    TkWinColormap *cmap = (TkWinColormap *) colormap;
    PALETTEENTRY entry, closeEntry;
    HDC dc = GetDC(NULL);
    
    entry.peRed = (color->red) >> 8;
    entry.peGreen = (color->green) >> 8;
    entry.peBlue = (color->blue) >> 8;
    entry.peFlags = 0;

    if (GetDeviceCaps(dc, RASTERCAPS) & RC_PALETTE) {
	unsigned long sizePalette = GetDeviceCaps(dc, SIZEPALETTE);
	UINT newPixel, closePixel;
	int new, refCount;
	Tcl_HashEntry *entryPtr;
	UINT index;

	/*
	 * Find the nearest existing palette entry.
	 */
	
	newPixel = RGB(entry.peRed, entry.peGreen, entry.peBlue);
	index = GetNearestPaletteIndex(cmap->palette, newPixel);
	GetPaletteEntries(cmap->palette, index, 1, &closeEntry);
	closePixel = RGB(closeEntry.peRed, closeEntry.peGreen,
		closeEntry.peBlue);

	/*
	 * If this is not a duplicate, allocate a new entry.  Note that
	 * we may get values for index that are above the current size
	 * of the palette.  This happens because we don't shrink the size of
	 * the palette object when we deallocate colors so there may be
	 * stale values that match in the upper slots.  We should ignore
	 * those values and just put the new color in as if the colors
	 * had not matched.
	 */
	
	if ((index >= cmap->size) || (newPixel != closePixel)) {
	    if (cmap->size == sizePalette) {
		color->red = closeEntry.peRed << 8;
		color->green = closeEntry.peGreen << 8;
		color->blue = closeEntry.peBlue << 8;
		entry = closeEntry;
		if (index >= cmap->size) {
		    OutputDebugString("XAllocColor: Colormap is bigger than we thought");
		}
	    } else {
		cmap->size++;
		ResizePalette(cmap->palette, cmap->size);
		SetPaletteEntries(cmap->palette, cmap->size - 1, 1, &entry);
	    }
	}

	color->pixel = PALETTERGB(entry.peRed, entry.peGreen, entry.peBlue);
	entryPtr = Tcl_CreateHashEntry(&cmap->refCounts,
		(char *) color->pixel, &new);
	if (new) {
	    refCount = 1;
	} else {
	    refCount = ((int) Tcl_GetHashValue(entryPtr)) + 1;
	}
	Tcl_SetHashValue(entryPtr, (ClientData)refCount);
    } else {
	
	/*
	 * Determine what color will actually be used on non-colormap systems.
	 */
	
	color->pixel = GetNearestColor(dc,
		RGB(entry.peRed, entry.peGreen, entry.peBlue));
	color->red = (GetRValue(color->pixel) << 8);
	color->green = (GetGValue(color->pixel) << 8);
	color->blue = (GetBValue(color->pixel) << 8);
    }

    ReleaseDC(NULL, dc);
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * XFreeColors --
 *
 *	Deallocate a block of colors.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Removes entries for the current palette and compacts the
 *	remaining set.
 *
 *----------------------------------------------------------------------
 */

void
XFreeColors(display, colormap, pixels, npixels, planes)
    Display* display;
    Colormap colormap;
    unsigned long* pixels;
    int npixels;
    unsigned long planes;
{
    TkWinColormap *cmap = (TkWinColormap *) colormap;
    COLORREF cref;
    UINT count, index, refCount;
    int i;
    PALETTEENTRY entry, *entries;
    Tcl_HashEntry *entryPtr;
    HDC dc = GetDC(NULL);

    /*
     * We don't have to do anything for non-palette devices.
     */
    
    if (GetDeviceCaps(dc, RASTERCAPS) & RC_PALETTE) {

	/*
	 * This is really slow for large values of npixels.
	 */

	for (i = 0; i < npixels; i++) {
	    entryPtr = Tcl_FindHashEntry(&cmap->refCounts,
		    (char *) pixels[i]);
	    if (!entryPtr) {
		panic("Tried to free a color that isn't allocated.");
	    }
	    refCount = (int) Tcl_GetHashValue(entryPtr) - 1;
	    if (refCount == 0) {
		cref = pixels[i] & 0x00ffffff;
		index = GetNearestPaletteIndex(cmap->palette, cref);
		GetPaletteEntries(cmap->palette, index, 1, &entry);
		if (cref == RGB(entry.peRed, entry.peGreen, entry.peBlue)) {
		    count = cmap->size - index;
		    entries = (PALETTEENTRY *) ckalloc(sizeof(PALETTEENTRY)
			    * count);
		    GetPaletteEntries(cmap->palette, index+1, count, entries);
		    SetPaletteEntries(cmap->palette, index, count, entries);
		    ckfree((char *) entries);
		    cmap->size--;
		} else {
		    panic("Tried to free a color that isn't allocated.");
		}
		Tcl_DeleteHashEntry(entryPtr);
	    } else {
		Tcl_SetHashValue(entryPtr, (ClientData)refCount);
	    }
	}
    }
    ReleaseDC(NULL, dc);
}

/*
 *----------------------------------------------------------------------
 *
 * XCreateColormap --
 *
 *	Allocate a new colormap.
 *
 * Results:
 *	Returns a newly allocated colormap.
 *
 * Side effects:
 *	Allocates an empty palette and color list.
 *
 *----------------------------------------------------------------------
 */

Colormap
XCreateColormap(display, w, visual, alloc)
    Display* display;
    Window w;
    Visual* visual;
    int alloc;
{
    char logPalBuf[sizeof(LOGPALETTE) + 256 * sizeof(PALETTEENTRY)];
    LOGPALETTE *logPalettePtr;
    PALETTEENTRY *entryPtr;
    TkWinColormap *cmap;
    Tcl_HashEntry *hashPtr;
    int new;
    UINT i;
    HPALETTE sysPal;

    /*
     * Allocate a starting palette with all of the reserved colors.
     */

    logPalettePtr = (LOGPALETTE *) logPalBuf;
    logPalettePtr->palVersion = 0x300;
    sysPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
    logPalettePtr->palNumEntries = GetPaletteEntries(sysPal, 0, 256,
	    logPalettePtr->palPalEntry);

    cmap = (TkWinColormap *) ckalloc(sizeof(TkWinColormap));
    cmap->size = logPalettePtr->palNumEntries;
    cmap->stale = 0;
    cmap->palette = CreatePalette(logPalettePtr);

    /*
     * Add hash entries for each of the static colors.
     */

    Tcl_InitHashTable(&cmap->refCounts, TCL_ONE_WORD_KEYS);
    for (i = 0; i < logPalettePtr->palNumEntries; i++) {
	entryPtr = logPalettePtr->palPalEntry + i;
	hashPtr = Tcl_CreateHashEntry(&cmap->refCounts, (char*) PALETTERGB(
	    entryPtr->peRed, entryPtr->peGreen, entryPtr->peBlue), &new);
	Tcl_SetHashValue(hashPtr, (ClientData)1);
    }

    return (Colormap)cmap;
}

/*
 *----------------------------------------------------------------------
 *
 * XFreeColormap --
 *
 *	Frees the resources associated with the given colormap.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Deletes the palette associated with the colormap.  Note that
 *	the palette must not be selected into a device context when
 *	this occurs.
 *
 *----------------------------------------------------------------------
 */

void
XFreeColormap(display, colormap)
    Display* display;
    Colormap colormap;
{
    TkWinColormap *cmap = (TkWinColormap *) colormap;
    if (!DeleteObject(cmap->palette)) {
	panic("Unable to free colormap, palette is still selected.");
    }
    Tcl_DeleteHashTable(&cmap->refCounts);
    ckfree((char *) cmap);
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinSelectPalette --
 *
 *	This function sets up the specified device context with a
 *	given palette.  If the palette is stale, it realizes it in
 *	the background unless the palette is the current global
 *	palette.
 *
 * Results:
 *	Returns the previous palette selected into the device context.
 *
 * Side effects:
 *	May change the system palette.
 *
 *----------------------------------------------------------------------
 */

HPALETTE
TkWinSelectPalette(dc, colormap)
    HDC dc;
    Colormap colormap;
{
    TkWinColormap *cmap = (TkWinColormap *) colormap;
    HPALETTE oldPalette;

    oldPalette = SelectPalette(dc, cmap->palette,
	    (cmap->palette == TkWinGetSystemPalette()) ? FALSE : TRUE);
    RealizePalette(dc);
    return oldPalette;
}