/*
 * Copyright © 1999 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#ifdef HAVE_CONFIG_H
#include <kdrive-config.h>
#endif
#include "kdrive.h"

Bool KdShadowFbAlloc(KdScreenInfo * screen, Bool rotate)
{
	int paddedWidth;
	void *buf;
	int width = rotate ? screen->height : screen->width;
	int height = rotate ? screen->width : screen->height;
	int bpp = screen->fb.bitsPerPixel;

	/* use fb computation for width */
	paddedWidth = ((width * bpp + FB_MASK) >> FB_SHIFT) * sizeof(FbBits);
	buf = malloc(paddedWidth * height);
	if (!buf)
		return FALSE;
	if (screen->fb.shadow)
		free(screen->fb.frameBuffer);
	screen->fb.shadow = TRUE;
	screen->fb.frameBuffer = buf;
	screen->fb.byteStride = paddedWidth;
	screen->fb.pixelStride = paddedWidth * 8 / bpp;
	return TRUE;
}

void KdShadowFbFree(KdScreenInfo * screen)
{
	if (screen->fb.shadow) {
		free(screen->fb.frameBuffer);
		screen->fb.frameBuffer = 0;
		screen->fb.shadow = FALSE;
	}
}

Bool
KdShadowSet(ScreenPtr pScreen, int randr, ShadowUpdateProc update,
	    ShadowWindowProc window)
{
	KdScreenPriv(pScreen);
	KdScreenInfo *screen = pScreenPriv->screen;

	shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
	if (screen->fb.shadow) {
		return shadowAdd(pScreen, pScreen->GetScreenPixmap(pScreen),
				 update, window, randr, 0);
	}
	return TRUE;
}

void KdShadowUnset(ScreenPtr pScreen)
{
	shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
}