sync code with last improvements from OpenBSD

xserver/fb/fbfillsp.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright © 1998 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 "fb.h"
+
+void
+fbFillSpans(DrawablePtr pDrawable,
+            GCPtr pGC, int n, DDXPointPtr ppt, int *pwidth, int fSorted)
+{
+    RegionPtr pClip = fbGetCompositeClip(pGC);
+    BoxPtr pextent, pbox;
+    int nbox;
+    int extentX1, extentX2, extentY1, extentY2;
+    int fullX1, fullX2, fullY1;
+    int partX1, partX2;
+
+    pextent = RegionExtents(pClip);
+    extentX1 = pextent->x1;
+    extentY1 = pextent->y1;
+    extentX2 = pextent->x2;
+    extentY2 = pextent->y2;
+    while (n--) {
+        fullX1 = ppt->x;
+        fullY1 = ppt->y;
+        fullX2 = fullX1 + (int) *pwidth;
+        ppt++;
+        pwidth++;
+
+        if (fullY1 < extentY1 || extentY2 <= fullY1)
+            continue;
+
+        if (fullX1 < extentX1)
+            fullX1 = extentX1;
+
+        if (fullX2 > extentX2)
+            fullX2 = extentX2;
+
+        if (fullX1 >= fullX2)
+            continue;
+
+        nbox = RegionNumRects(pClip);
+        if (nbox == 1) {
+            fbFill(pDrawable, pGC, fullX1, fullY1, fullX2 - fullX1, 1);
+        }
+        else {
+            pbox = RegionRects(pClip);
+            while (nbox--) {
+                if (pbox->y1 <= fullY1 && fullY1 < pbox->y2) {
+                    partX1 = pbox->x1;
+                    if (partX1 < fullX1)
+                        partX1 = fullX1;
+                    partX2 = pbox->x2;
+                    if (partX2 > fullX2)
+                        partX2 = fullX2;
+                    if (partX2 > partX1) {
+                        fbFill(pDrawable, pGC,
+                               partX1, fullY1, partX2 - partX1, 1);
+                    }
+                }
+                pbox++;
+            }
+        }
+    }
+}