[librsvg] Avoid repeatedly calculating floor and ceil values here

[Christian Persch <chpe src gnome org>]

commit e005c4ad97fade8193e077414351a919db0f9447
Author: Christian Persch <chpe gnome org>
Date:   Fri Sep 16 01:22:08 2011 +0200

    Avoid repeatedly calculating floor and ceil values here

 rsvg-filter.c |   30 ++++++++++++++++++------------
 1 files changed, 18 insertions(+), 12 deletions(-)
---
diff --git a/rsvg-filter.c b/rsvg-filter.c
index e63a440..fe694c4 100644
--- a/rsvg-filter.c
+++ b/rsvg-filter.c
@@ -172,6 +172,7 @@ gdk_pixbuf_get_interp_pixel (guchar * src, gdouble ox, gdouble oy, guchar ch, Rs
     double xmod, ymod;
     double dist1, dist2, dist3, dist4;
     double c, c1, c2, c3, c4;
+    double fox, foy, cox, coy;
 
     xmod = fmod (ox, 1.0);
     ymod = fmod (oy, 1.0);
@@ -181,29 +182,34 @@ gdk_pixbuf_get_interp_pixel (guchar * src, gdouble ox, gdouble oy, guchar ch, Rs
     dist3 = (xmod) * (ymod);
     dist4 = (1 - xmod) * (ymod);
 
-    if (floor (ox) <= boundarys.x0 || floor (ox) >= boundarys.x1 ||
-        floor (oy) <= boundarys.y0 || floor (oy) >= boundarys.y1)
+    fox = floor (ox);
+    foy = floor (oy);
+    cox = ceil (ox);
+    coy = ceil (oy);
+
+    if (fox <= boundarys.x0 || fox >= boundarys.x1 ||
+        foy <= boundarys.y0 || foy >= boundarys.y1)
         c1 = 0;
     else
-        c1 = src[(guint) floor (oy) * rowstride + (guint) floor (ox) * 4 + ch];
+        c1 = src[(guint) foy * rowstride + (guint) fox * 4 + ch];
 
-    if (ceil (ox) <= boundarys.x0 || ceil (ox) >= boundarys.x1 ||
-        floor (oy) <= boundarys.y0 || floor (oy) >= boundarys.y1)
+    if (cox <= boundarys.x0 || cox >= boundarys.x1 ||
+        foy <= boundarys.y0 || foy >= boundarys.y1)
         c2 = 0;
     else
-        c2 = src[(guint) floor (oy) * rowstride + (guint) ceil (ox) * 4 + ch];
+        c2 = src[(guint) foy * rowstride + (guint) cox * 4 + ch];
 
-    if (ceil (ox) <= boundarys.x0 || ceil (ox) >= boundarys.x1 ||
-        ceil (oy) <= boundarys.y0 || ceil (oy) >= boundarys.y1)
+    if (cox <= boundarys.x0 || cox >= boundarys.x1 ||
+        coy <= boundarys.y0 || coy >= boundarys.y1)
         c3 = 0;
     else
-        c3 = src[(guint) ceil (oy) * rowstride + (guint) ceil (ox) * 4 + ch];
+        c3 = src[(guint) coy * rowstride + (guint) cox * 4 + ch];
 
-    if (floor (ox) <= boundarys.x0 || floor (ox) >= boundarys.x1 ||
-        ceil (oy) <= boundarys.y0 || ceil (oy) >= boundarys.y1)
+    if (fox <= boundarys.x0 || fox >= boundarys.x1 ||
+        coy <= boundarys.y0 || coy >= boundarys.y1)
         c4 = 0;
     else
-        c4 = src[(guint) ceil (oy) * rowstride + (guint) floor (ox) * 4 + ch];
+        c4 = src[(guint) coy * rowstride + (guint) fox * 4 + ch];
 
     c = (c1 * dist1 + c2 * dist2 + c3 * dist3 + c4 * dist4) / (dist1 + dist2 + dist3 + dist4);