1 files changed, 134 insertions, 0 deletions
diff --git a/fb/fbedge.c b/fb/fbedge.c
new file mode 100644
index 000000000..7a383020b
--- /dev/null
+++ b/fb/fbedge.c
@@ -0,0 +1,134 @@
+/*
+ * $Id$
+ *
+ * Copyright © 2004 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 <config.h>
+#endif
+#include "fb.h"
+
+#ifdef RENDER
+
+#include "picturestr.h"
+#include "mipict.h"
+#include "renderedge.h"
+#include "fbpict.h"
+
+/*
+ * 8 bit alpha
+ */
+
+#define N_BITS	8
+#define rasterizeEdges   fbRasterizeEdges8
+
+#define DefineAlpha(line,x) \
+    CARD8	*__ap = (CARD8 *) line + (x)
+
+#define StepAlpha	__ap++
+
+#define AddAlpha(a) {				    \
+    CARD16 __a = a + *__ap;			    \
+    *__ap = ((CARD8) ((__a) | (0 - ((__a) >> 8)))); \
+}
+
+#include "fbedgeimp.h"
+
+#undef AddAlpha
+#undef StepAlpha
+#undef DefineAlpha
+#undef rasterizeEdges
+#undef N_BITS
+
+/*
+ * 4 bit alpha
+ */
+
+#define N_BITS	4
+#define rasterizeEdges	fbRasterizeEdges4
+
+#if BITMAP_BIT_ORDER == LSBFirst
+#define Shift4(o)	((o) << 2)
+#else
+#define Shift4(o)	((1-(o)) << 2)
+#endif
+
+#define Get4(x,o)	(((x) >> Shift4(o)) & 0xf)
+#define Put4(x,o,v)	(((x) & ~(0xf << Shift4(o))) | (((v) & 0xf) << Shift4(o)))
+
+#define DefineAlpha(line,x) \
+    CARD8   *__ap = (CARD8 *) line + ((x) >> 1); \
+    int	    __ao = (x) & 1
+
+#define StepAlpha	((__ap += __ao), (__ao ^= 1))
+
+#define AddAlpha(a) {						\
+    CARD8   __o = *__ap;					\
+    CARD8   __a = (a) + Get4(__o, __ao);			\
+    *__ap = Put4 (__o, __ao, __a | (0 - ((__a) >> 4)));		\
+}
+
+#include "fbedgeimp.h"
+
+#undef AddAlpha
+#undef StepAlpha
+#undef DefineAlpha
+#undef rasterizeEdges
+#undef N_BITS
+
+
+/*
+ * 1 bit alpha
+ */
+
+#define N_BITS 1
+#define rasterizeEdges	fbRasterizeEdges1
+
+#include "fbedgeimp.h"
+
+#undef rasterizeEdges
+#undef N_BITS
+
+void
+fbRasterizeEdges (FbBits	*buf,
+		  int		bpp,
+		  int		width,
+		  int		stride,
+		  RenderEdge	*l,
+		  RenderEdge	*r,
+		  xFixed	t,
+		  xFixed	b)
+{
+    switch (bpp) {
+    case 1:
+	fbRasterizeEdges1 (buf, width, stride, l, r, t, b);
+	break;
+    case 4:
+	fbRasterizeEdges4 (buf, width, stride, l, r, t, b);
+	break;
+    case 8:
+	fbRasterizeEdges8 (buf, width, stride, l, r, t, b);
+	break;
+    }
+}
+
+#endif /* RENDER */