shadow: Lift 32->24 conversion from modesetting to dix

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>

3 files changed, 142 insertions, 0 deletions

diff --git a/miext/shadow/Makefile.am b/miext/shadow/Makefile.am
index 27cf41422..b611c9bb0 100644
--- a/miext/shadow/Makefile.am
+++ b/miext/shadow/Makefile.am
@@ -10,6 +10,7 @@ libshadow_la_SOURCES =		\
 	c2p_core.h		\
 	shadow.c		\
 	shadow.h		\
+	sh3224.c		\
 	shafb4.c		\
 	shafb8.c		\
 	shalloc.c		\
diff --git a/miext/shadow/sh3224.c b/miext/shadow/sh3224.c
new file mode 100644
index 000000000..ba541217e
--- /dev/null
+++ b/miext/shadow/sh3224.c
@@ -0,0 +1,138 @@
+/*
+ * 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.
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include "dix-config.h"
+#endif
+
+#include "shadow.h"
+#include "fb.h"
+
+#define Get8(a)	((CARD32) READ(a))
+
+#if BITMAP_BIT_ORDER == MSBFirst
+#define Get24(a)    ((Get8(a) << 16) | (Get8((a)+1) << 8) | Get8((a)+2))
+#define Put24(a,p)  ((WRITE((a+0), (CARD8) ((p) >> 16))), \
+		     (WRITE((a+1), (CARD8) ((p) >> 8))), \
+		     (WRITE((a+2), (CARD8) (p))))
+#else
+#define Get24(a)    (Get8(a) | (Get8((a)+1) << 8) | (Get8((a)+2)<<16))
+#define Put24(a,p)  ((WRITE((a+0), (CARD8) (p))), \
+		     (WRITE((a+1), (CARD8) ((p) >> 8))), \
+		     (WRITE((a+2), (CARD8) ((p) >> 16))))
+#endif
+
+static void
+sh24_32BltLine(CARD8 *srcLine,
+               CARD8 *dstLine,
+               int width)
+{
+    CARD32 *src;
+    CARD8 *dst;
+    int w;
+    CARD32 pixel;
+
+    src = (CARD32 *) srcLine;
+    dst = dstLine;
+    w = width;
+
+    while (((long)dst & 3) && w) {
+	w--;
+	pixel = READ(src++);
+	Put24(dst, pixel);
+	dst += 3;
+    }
+    /* Do four aligned pixels at a time */
+    while (w >= 4) {
+	CARD32 s0, s1;
+
+	s0 = READ(src++);
+	s1 = READ(src++);
+#if BITMAP_BIT_ORDER == LSBFirst
+	WRITE((CARD32 *) dst, (s0 & 0xffffff) | (s1 << 24));
+#else
+	WRITE((CARD32 *) dst, (s0 << 8) | ((s1 & 0xffffff) >> 16));
+#endif
+	s0 = READ(src++);
+#if BITMAP_BIT_ORDER == LSBFirst
+	WRITE((CARD32 *) (dst + 4),
+	      ((s1 & 0xffffff) >> 8) | (s0 << 16));
+#else
+	WRITE((CARD32 *) (dst + 4),
+	      (s1 << 16) | ((s0 & 0xffffff) >> 8));
+#endif
+	s1 = READ(src++);
+#if BITMAP_BIT_ORDER == LSBFirst
+	WRITE((CARD32 *) (dst + 8),
+	      ((s0 & 0xffffff) >> 16) | (s1 << 8));
+#else
+	WRITE((CARD32 *) (dst + 8), (s0 << 24) | (s1 & 0xffffff));
+#endif
+	dst += 12;
+	w -= 4;
+    }
+    while (w--) {
+	pixel = READ(src++);
+	Put24(dst, pixel);
+	dst += 3;
+    }
+}
+
+void
+shadowUpdate32to24(ScreenPtr pScreen, shadowBufPtr pBuf)
+{
+    RegionPtr damage = shadowDamage(pBuf);
+    PixmapPtr pShadow = pBuf->pPixmap;
+    int nbox = RegionNumRects(damage);
+    BoxPtr pbox = RegionRects(damage);
+    FbStride shaStride;
+    int shaBpp;
+    _X_UNUSED int shaXoff, shaYoff;
+    int x, y, w, h;
+    CARD32 winSize;
+    FbBits *shaBase, *shaLine;
+    CARD8 *winBase = NULL, *winLine;
+
+    fbGetDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
+                  shaYoff);
+
+    /* just get the initial window base + stride */
+    winBase = (*pBuf->window)(pScreen, 0, 0, SHADOW_WINDOW_WRITE,
+			      &winSize, pBuf->closure);
+
+    while (nbox--) {
+        x = pbox->x1;
+        y = pbox->y1;
+        w = pbox->x2 - pbox->x1;
+        h = pbox->y2 - pbox->y1;
+
+	winLine = winBase + y * winSize + (x * 3);
+        shaLine = shaBase + y * shaStride + ((x * shaBpp) >> FB_SHIFT);
+
+        while (h--) {
+	    sh24_32BltLine((CARD8 *)shaLine, (CARD8 *)winLine, w);
+	    winLine += winSize;
+            shaLine += shaStride;
+        }
+        pbox++;
+    }
+}
diff --git a/miext/shadow/shadow.h b/miext/shadow/shadow.h
index 7f22169dc..0bbbe45b6 100644
--- a/miext/shadow/shadow.h
+++ b/miext/shadow/shadow.h
@@ -156,6 +156,9 @@ extern _X_EXPORT void
 extern _X_EXPORT void
  shadowUpdateRotate32(ScreenPtr pScreen, shadowBufPtr pBuf);
 
+extern _X_EXPORT void
+ shadowUpdate32to24(ScreenPtr pScreen, shadowBufPtr pBuf);
+
 typedef void (*shadowUpdateProc) (ScreenPtr, shadowBufPtr);
 
 extern _X_EXPORT shadowUpdateProc shadowUpdatePackedWeak(void);