From a44d24a9896a3290c4a3ecd1ff2aa0ea629d41a9 Mon Sep 17 00:00:00 2001
From: lecoanet
Date: Fri, 20 Dec 2002 13:48:47 +0000
Subject: Petite optimisation de la fonction de d�composition des transfos.

---
 generic/Transfo.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'generic')

diff --git a/generic/Transfo.c b/generic/Transfo.c
index a45b701..6c1c408 100644
--- a/generic/Transfo.c
+++ b/generic/Transfo.c
@@ -395,8 +395,14 @@ ZnTransfoDecompose(ZnTransfo	*t,
   local._[1][1] -= local._[0][1]*shear;
   len = sqrt(local._[1][0]*local._[1][0] +
 	     local._[1][1]*local._[1][1]); /* Get y scale from 2nd row */
-  if (scale)
+  if (scale) {
     scale->y = len < PRECISION_LIMIT ? 0.0 : len;
+  }
+
+  if (!shearxy && !rotation) {
+    return;
+  }
+
   local._[1][0] /= len;			 /* Normalize 2nd row */
   local._[1][1] /= len;
   shear /= len;
@@ -404,6 +410,11 @@ ZnTransfoDecompose(ZnTransfo	*t,
     *shearxy = ABS(shear) < PRECISION_LIMIT ? 0.0 : shear;
     //printf("shear %f\n", *shearxy);
   }
+
+  if (!rotation) {
+    return;
+  }
+
   //printf("Matrix after scale & shear extracted\n");
   //ZnPrintTransfo(&local);
   /* Get rotation */
-- 
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