Initial revision

1 files changed, 170 insertions, 0 deletions

diff --git a/miext/shadow/shplanar8.c b/miext/shadow/shplanar8.c
new file mode 100644
index 000000000..c82b5f931
--- /dev/null
+++ b/miext/shadow/shplanar8.c
@@ -0,0 +1,170 @@
+/*
+ * $XFree86: xc/programs/Xserver/miext/shadow/shplanar8.c,v 1.4 2001/10/28 03:34:16 tsi 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++;
+    }
+}
+