Add RenderAddTraps. Rewrite trapezoid rendering code.

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 */

fb/fbedgeimp.h

@@ -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.
+ */
+
+#ifndef rasterizeSpan
+#endif
+
+static void
+rasterizeEdges (FbBits		*buf,
+		int		width,
+		int		stride,
+		RenderEdge	*l,
+		RenderEdge	*r,
+		xFixed		t,
+		xFixed		b)
+{
+    xFixed  y = t;
+    FbBits  *line;
+    
+    line = buf + xFixedToInt (y) * stride;
+    
+    for (;;)
+    {
+	xFixed	lx, rx;
+	int	lxi, rxi;
+	
+	/* clip X */
+	lx = l->x;
+	if (lx < 0)
+	    lx = 0;
+	rx = r->x;
+	if (xFixedToInt (rx) >= width)
+	    rx = IntToxFixed (width);
+	
+	/* Skip empty (or backwards) sections */
+	if (rx > lx)
+	{
+
+	    /* Find pixel bounds for span */
+	    lxi = xFixedToInt (lx);
+	    rxi = xFixedToInt (rx);
+
+#if N_BITS == 1
+	    {
+		FbBits  *a = line;
+		FbBits  startmask, endmask;
+		int	    nmiddle;
+		int	    width = rxi - lxi;
+		int	    x = lxi;
+
+		a += x >> FB_SHIFT;
+		x &= FB_MASK;
+
+		FbMaskBits (x, width, startmask, nmiddle, endmask);
+		if (startmask)
+		    *a++ |= startmask;
+		while (nmiddle--)
+		    *a++ = FB_ALLONES;
+		if (endmask)
+		    *a |= endmask;
+	    }
+#else
+	    {
+		DefineAlpha(line,lxi);
+		int	    lxs, rxs;
+
+		/* Sample coverage for edge pixels */
+		lxs = RenderSamplesX (lx, N_BITS);
+		rxs = RenderSamplesX (rx, N_BITS);
+
+		/* Add coverage across row */
+		if (lxi == rxi)
+		{
+		    AddAlpha (rxs - lxs);
+		}
+		else
+		{
+		    int	xi;
+
+		    AddAlpha (N_X_FRAC(N_BITS) - lxs);
+		    StepAlpha;
+		    for (xi = lxi + 1; xi < rxi; xi++)
+		    {
+			AddAlpha (N_X_FRAC(N_BITS));
+			StepAlpha;
+		    }
+		    AddAlpha (rxs);
+		}
+	    }
+#endif
+	}
+
+	if (y == b)
+	    break;
+
+#if N_BITS > 1
+	if (xFixedFrac (y) != Y_FRAC_LAST(N_BITS))
+	{
+	    RenderEdgeStepSmall (l);
+	    RenderEdgeStepSmall (r);
+	    y += STEP_Y_SMALL(N_BITS);
+	}
+	else
+#endif
+	{
+	    RenderEdgeStepBig (l);
+	    RenderEdgeStepBig (r);
+	    y += STEP_Y_BIG(N_BITS);
+	    line += stride;
+	}
+    }
+}
+
+#undef rasterizeSpan

fb/fbpict.c

@@ -1230,6 +1230,8 @@ fbPictureInit (ScreenPtr pScreen, PictFormatPtr formats, int nformats)
     ps->Glyphs = miGlyphs;
     ps->CompositeRects = miCompositeRects;
     ps->RasterizeTrapezoid = fbRasterizeTrapezoid;
+    ps->AddTraps = fbAddTraps;
+    ps->AddTriangles = fbAddTriangles;
 
 #endif /* RENDER */
 

fb/fbpict.h

@@ -25,6 +25,8 @@
 #ifndef _FBPICT_H_
 #define _FBPICT_H_
 
+#include "renderedge.h"
+
 #define FbIntMult(a,b,t) ( (t) = (a) * (b) + 0x80, ( ( ( (t)>>8 ) + (t) )>>8 ) )
 #define FbIntDiv(a,b)	 (((CARD16) (a) * 255) / (b))
 
@@ -199,6 +201,15 @@ typedef struct _FbAccessMap {
  */
 extern FbAccessMap  fbAccessMap[];
 
+/* fbaddtrap.c */
+
+void
+fbAddTraps (PicturePtr	pPicture,
+	    INT16	xOff,
+	    INT16	yOff,
+	    int		ntrap,
+	    xTrap	*traps);
+
 /* fbcompose.c */
 
 typedef struct _fbCompSrc {
@@ -817,6 +828,17 @@ fbCompositeGeneral (CARD8	op,
 		    CARD16	height);
 
 
+/* fbedge.c */
+void
+fbRasterizeEdges (FbBits	*buf,
+		  int		bpp,
+		  int		width,
+		  int		stride,
+		  RenderEdge	*l,
+		  RenderEdge	*r,
+		  xFixed	t,
+		  xFixed	b);
+
 /* fbpict.c */
 CARD32
 fbOver (CARD32 x, CARD32 y);
@@ -1024,10 +1046,25 @@ fbComposite (CARD8      op,
 	     CARD16     height);
 
 /* fbtrap.c */
+
+void
+fbAddTraps (PicturePtr	pPicture,
+	    INT16	xOff,
+	    INT16	yOff,
+	    int		ntrap,
+	    xTrap	*traps);
+
 void
 fbRasterizeTrapezoid (PicturePtr    alpha,
 		      xTrapezoid    *trap,
 		      int	    x_off,
 		      int	    y_off);
 
+void
+fbAddTriangles (PicturePtr  pPicture,
+		INT16	    xOff,
+		INT16	    yOff,
+		int	    ntri,
+		xTriangle   *tris);
+
 #endif /* _FBPICT_H_ */