Initial revision

1 files changed, 196 insertions, 0 deletions

diff --git a/render/mitrap.c b/render/mitrap.c
new file mode 100644
index 000000000..7f592ccd4
--- /dev/null
+++ b/render/mitrap.c
@@ -0,0 +1,196 @@
+/*
+ * $XFree86: xc/programs/Xserver/render/mitrap.c,v 1.9 2002/11/05 23:39:16 keithp Exp $
+ *
+ * Copyright © 2002 Keith Packard, member of The XFree86 Project, Inc.
+ *
+ * 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 "scrnintstr.h"
+#include "gcstruct.h"
+#include "pixmapstr.h"
+#include "windowstr.h"
+#include "servermd.h"
+#include "mi.h"
+#include "picturestr.h"
+#include "mipict.h"
+
+PicturePtr
+miCreateAlphaPicture (ScreenPtr	    pScreen, 
+		      PicturePtr    pDst,
+		      PictFormatPtr pPictFormat,
+		      CARD16	    width,
+		      CARD16	    height)
+{
+    PixmapPtr	    pPixmap;
+    PicturePtr	    pPicture;
+    GCPtr	    pGC;
+    int		    error;
+    xRectangle	    rect;
+
+    if (width > 32767 || height > 32767)
+	return 0;
+
+    if (!pPictFormat)
+    {
+	if (pDst->polyEdge == PolyEdgeSharp)
+	    pPictFormat = PictureMatchFormat (pScreen, 1, PICT_a1);
+	else
+	    pPictFormat = PictureMatchFormat (pScreen, 8, PICT_a8);
+	if (!pPictFormat)
+	    return 0;
+    }
+
+    pPixmap = (*pScreen->CreatePixmap) (pScreen, width, height, 
+					pPictFormat->depth);
+    if (!pPixmap)
+	return 0;
+    pGC = GetScratchGC (pPixmap->drawable.depth, pScreen);
+    if (!pGC)
+    {
+	(*pScreen->DestroyPixmap) (pPixmap);
+	return 0;
+    }
+    ValidateGC (&pPixmap->drawable, pGC);
+    rect.x = 0;
+    rect.y = 0;
+    rect.width = width;
+    rect.height = height;
+    (*pGC->ops->PolyFillRect)(&pPixmap->drawable, pGC, 1, &rect);
+    FreeScratchGC (pGC);
+    pPicture = CreatePicture (0, &pPixmap->drawable, pPictFormat,
+			      0, 0, serverClient, &error);
+    (*pScreen->DestroyPixmap) (pPixmap);
+    return pPicture;
+}
+
+static xFixed
+miLineFixedX (xLineFixed *l, xFixed y, Bool ceil)
+{
+    xFixed	    dx = l->p2.x - l->p1.x;
+    xFixed_32_32    ex = (xFixed_32_32) (y - l->p1.y) * dx;
+    xFixed	    dy = l->p2.y - l->p1.y;
+    if (ceil)
+	ex += (dy - 1);
+    return l->p1.x + (xFixed) (ex / dy);
+}
+
+void
+miTrapezoidBounds (int ntrap, xTrapezoid *traps, BoxPtr box)
+{
+    box->y1 = MAXSHORT;
+    box->y2 = MINSHORT;
+    box->x1 = MAXSHORT;
+    box->x2 = MINSHORT;
+    for (; ntrap; ntrap--, traps++)
+    {
+	INT16 x1, y1, x2, y2;
+
+	if (!xTrapezoidValid(traps))
+	    continue;
+	y1 = xFixedToInt (traps->top);
+	if (y1 < box->y1)
+	    box->y1 = y1;
+	
+	y2 = xFixedToInt (xFixedCeil (traps->bottom));
+	if (y2 > box->y2)
+	    box->y2 = y2;
+	
+	x1 = xFixedToInt (min (miLineFixedX (&traps->left, traps->top, FALSE),
+			       miLineFixedX (&traps->left, traps->bottom, FALSE)));
+	if (x1 < box->x1)
+	    box->x1 = x1;
+	
+	x2 = xFixedToInt (xFixedCeil (max (miLineFixedX (&traps->right, traps->top, TRUE),
+					   miLineFixedX (&traps->right, traps->bottom, TRUE))));
+	if (x2 > box->x2)
+	    box->x2 = x2;
+    }
+}
+
+void
+miTrapezoids (CARD8	    op,
+	      PicturePtr    pSrc,
+	      PicturePtr    pDst,
+	      PictFormatPtr maskFormat,
+	      INT16	    xSrc,
+	      INT16	    ySrc,
+	      int	    ntrap,
+	      xTrapezoid    *traps)
+{
+    ScreenPtr		pScreen = pDst->pDrawable->pScreen;
+    PictureScreenPtr    ps = GetPictureScreen(pScreen);
+    PicturePtr		pPicture = 0;
+    BoxRec		bounds;
+    INT16		xDst, yDst;
+    INT16		xRel, yRel;
+    
+    xDst = traps[0].left.p1.x >> 16;
+    yDst = traps[0].left.p1.y >> 16;
+    
+    if (maskFormat)
+    {
+	miTrapezoidBounds (ntrap, traps, &bounds);
+	if (bounds.y1 >= bounds.y2 || bounds.x1 >= bounds.x2)
+	    return;
+	pPicture = miCreateAlphaPicture (pScreen, pDst, maskFormat,
+					 bounds.x2 - bounds.x1,
+					 bounds.y2 - bounds.y1);
+	if (!pPicture)
+	    return;
+    }
+    for (; ntrap; ntrap--, traps++)
+    {
+	if (!xTrapezoidValid(traps))
+	    continue;
+	if (!maskFormat)
+	{
+	    miTrapezoidBounds (1, traps, &bounds);
+	    if (bounds.y1 >= bounds.y2 || bounds.x1 >= bounds.x2)
+		continue;
+	    pPicture = miCreateAlphaPicture (pScreen, pDst, maskFormat,
+					     bounds.x2 - bounds.x1,
+					     bounds.y2 - bounds.y1);
+	    if (!pPicture)
+		continue;
+	}
+	(*ps->RasterizeTrapezoid) (pPicture, traps, 
+				   -bounds.x1, -bounds.y1);
+	if (!maskFormat)
+	{
+	    xRel = bounds.x1 + xSrc - xDst;
+	    yRel = bounds.y1 + ySrc - yDst;
+	    CompositePicture (op, pSrc, pPicture, pDst,
+			      xRel, yRel, 0, 0, bounds.x1, bounds.y1,
+			      bounds.x2 - bounds.x1,
+			      bounds.y2 - bounds.y1);
+	    FreePicture (pPicture, 0);
+	}
+    }
+    if (maskFormat)
+    {
+	xRel = bounds.x1 + xSrc - xDst;
+	yRel = bounds.y1 + ySrc - yDst;
+	CompositePicture (op, pSrc, pPicture, pDst,
+			  xRel, yRel, 0, 0, bounds.x1, bounds.y1,
+			  bounds.x2 - bounds.x1,
+			  bounds.y2 - bounds.y1);
+	FreePicture (pPicture, 0);
+    }
+}