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/*
* $XFree86: xc/programs/Xserver/miext/shadow/shplanar8.c,v 1.3 2001/05/29 04:54:13 keithp Exp $
*
* Copyright © 2000 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.
*/
#include "X.h"
#include "scrnintstr.h"
#include "windowstr.h"
#include "font.h"
#include "dixfontstr.h"
#include "fontstruct.h"
#include "mi.h"
#include "regionstr.h"
#include "globals.h"
#include "gcstruct.h"
#include "shadow.h"
#include "fb.h"
/*
* Expose 8bpp depth 4
*/
/*
* 32->8 conversion:
*
* 7 6 5 4 3 2 1 0
* A B C D E F G H
*
* 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* m1 D x x x x x x x C x x x x x x x B x x x x x x x A x x x x x x x sha[0] << (7-(p))
* m2 x x x x H x x x x x x x G x x x x x x x F x x x x x x x E x x x sha[1] << (3-(p))
* m3 D C B A m1 & 0x80808080
* m4 H G F E m2 & 0x08080808
* m5 D H C G B F A E m3 | m4
* m6 D H C G B F m5 >> 9
* m7 D H C D G H B C F G A B E F m5 | m6
* m8 D H C D G H m7 >> 18
* m9 D H C D G H B C D F G H A B C D E F G H m7 | m8
*/
#define PL_SHIFT 8
#define PL_UNIT (1 << PL_SHIFT)
#define PL_MASK (PL_UNIT - 1)
#if 0
#define GetBits(p,o,d) { \
CARD32 m1,m2,m3,m4,m5,m6,m7,m8; \
m1 = sha[o] << (7 - (p)); \
m2 = sha[(o)+1] << (3 - (p)); \
m3 = m1 & 0x80808080; \
m4 = m2 & 0x08080808; \
m5 = m3 | m4; \
m6 = m5 >> 9; \
m7 = m5 | m6; \
m8 = m7 >> 18; \
d = m7 | m8; \
}
#else
#define GetBits(p,o,d) { \
CARD32 m5,m7; \
m5 = ((sha[o] << (7 - (p))) & 0x80808080) | ((sha[(o)+1] << (3 - (p))) & 0x08080808); \
m7 = m5 | (m5 >> 9); \
d = m7 | (m7 >> 18); \
}
#endif
void
shadowUpdatePlanar4x8 (ScreenPtr pScreen,
shadowBufPtr pBuf)
{
RegionPtr damage = &pBuf->damage;
PixmapPtr pShadow = pBuf->pPixmap;
int nbox = REGION_NUM_RECTS (damage);
BoxPtr pbox = REGION_RECTS (damage);
CARD32 *shaBase, *shaLine, *sha;
CARD8 s1, s2, s3, s4;
FbStride shaStride;
int scrBase, scrLine, scr;
int shaBpp;
int shaXoff, shaYoff; /* XXX assumed to be zero */
int x, y, w, h, width;
int i;
CARD32 *winBase = NULL, *win;
CARD32 winSize;
int plane;
fbGetStipDrawable (&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff, shaYoff);
while (nbox--)
{
x = pbox->x1 * shaBpp;
y = pbox->y1;
w = (pbox->x2 - pbox->x1) * shaBpp;
h = pbox->y2 - pbox->y1;
w = (w + (x & PL_MASK) + PL_MASK) >> PL_SHIFT;
x &= ~PL_MASK;
scrLine = (x >> PL_SHIFT);
shaLine = shaBase + y * shaStride + (x >> FB_SHIFT);
while (h--)
{
for (plane = 0; plane < 4; plane++)
{
width = w;
scr = scrLine;
sha = shaLine;
winSize = 0;
scrBase = 0;
while (width) {
/* how much remains in this window */
i = scrBase + winSize - scr;
if (i <= 0 || scr < scrBase)
{
winBase = (CARD32 *) (*pBuf->window) (pScreen,
y,
(scr << 4) | (plane),
SHADOW_WINDOW_WRITE,
&winSize,
pBuf->closure);
if(!winBase)
return;
winSize >>= 2;
scrBase = scr;
i = winSize;
}
win = winBase + (scr - scrBase);
if (i > width)
i = width;
width -= i;
scr += i;
while (i--)
{
GetBits(plane,0,s1);
GetBits(plane,2,s2);
GetBits(plane,4,s3);
GetBits(plane,6,s4);
*win++ = s1 | (s2 << 8) | (s3 << 16) | (s4 << 24);
sha += 8;
}
}
}
shaLine += shaStride;
y++;
}
pbox++;
}
}
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