Remove .gitignore do nothing is ignored.

[synfig.git] / synfig-core / trunk / src / modules / lyr_std / rotate.cpp

diff --git a/synfig-core/trunk/src/modules/lyr_std/rotate.cpp b/synfig-core/trunk/src/modules/lyr_std/rotate.cpp
index 6c8e9e2..fd13f92 100644 (file)
--- a/synfig-core/trunk/src/modules/lyr_std/rotate.cpp
+++ b/synfig-core/trunk/src/modules/lyr_std/rotate.cpp
@@ -6,6 +6,7 @@
 **
 **     \legal
 **     Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**     Copyright (c) 2008 Chris Moore
 **
 **     This package is free software; you can redistribute it and/or
 **     modify it under the terms of the GNU General Public License as
@@ -188,42 +189,50 @@ Rotate::accelerated_render(Context context,Surface *surface,int quality, const R
 
        Point tl(renddesc.get_tl()-origin);
        Point br(renddesc.get_br()-origin);
-       Point rot_tl(cos_val*tl[0]+sin_val*tl[1],-sin_val*tl[0]+cos_val*tl[1]);
-       Point rot_br(cos_val*br[0]+sin_val*br[1],-sin_val*br[0]+cos_val*br[1]);
-       Point rot_tr(cos_val*br[0]+sin_val*tl[1],-sin_val*br[0]+cos_val*tl[1]);
-       Point rot_bl(cos_val*tl[0]+sin_val*br[1],-sin_val*tl[0]+cos_val*br[1]);
-       rot_tl+=origin;
-       rot_br+=origin;
-       rot_tr+=origin;
-       rot_bl+=origin;
-
-       Point min_point(min(min(min(rot_tl[0],rot_br[0]),rot_tr[0]),rot_bl[0]),min(min(min(rot_tl[1],rot_br[1]),rot_tr[1]),rot_bl[1]));
-       Point max_point(max(max(max(rot_tl[0],rot_br[0]),rot_tr[0]),rot_bl[0]),max(max(max(rot_tl[1],rot_br[1]),rot_tr[1]),rot_bl[1]));
-
-       if(tl[0]>br[0])
-       {
-               tl[0]=max_point[0];
-               br[0]=min_point[0];
-       }
-       else
-       {
-               br[0]=max_point[0];
-               tl[0]=min_point[0];
-       }
-       if(tl[1]>br[1])
-       {
-               tl[1]=max_point[1];
-               br[1]=min_point[1];
-       }
-       else
+
        {
-               br[1]=max_point[1];
-               tl[1]=min_point[1];
+               Point rot_tl(cos_val*tl[0]+sin_val*tl[1],-sin_val*tl[0]+cos_val*tl[1]);
+               Point rot_br(cos_val*br[0]+sin_val*br[1],-sin_val*br[0]+cos_val*br[1]);
+               Point rot_tr(cos_val*br[0]+sin_val*tl[1],-sin_val*br[0]+cos_val*tl[1]);
+               Point rot_bl(cos_val*tl[0]+sin_val*br[1],-sin_val*tl[0]+cos_val*br[1]);
+               rot_tl+=origin;
+               rot_br+=origin;
+               rot_tr+=origin;
+               rot_bl+=origin;
+
+               Point min_point(min(min(min(rot_tl[0],rot_br[0]),rot_tr[0]),rot_bl[0]),min(min(min(rot_tl[1],rot_br[1]),rot_tr[1]),rot_bl[1]));
+               Point max_point(max(max(max(rot_tl[0],rot_br[0]),rot_tr[0]),rot_bl[0]),max(max(max(rot_tl[1],rot_br[1]),rot_tr[1]),rot_bl[1]));
+
+               if(tl[0]>br[0])
+               {
+                       tl[0]=max_point[0];
+                       br[0]=min_point[0];
+               }
+               else
+               {
+                       br[0]=max_point[0];
+                       tl[0]=min_point[0];
+               }
+               if(tl[1]>br[1])
+               {
+                       tl[1]=max_point[1];
+                       br[1]=min_point[1];
+               }
+               else
+               {
+                       br[1]=max_point[1];
+                       tl[1]=min_point[1];
+               }
        }
 
        Real pw=(renddesc.get_w())/(renddesc.get_br()[0]-renddesc.get_tl()[0]);
        Real ph=(renddesc.get_h())/(renddesc.get_br()[1]-renddesc.get_tl()[1]);
 
+       // we're going to round the canvas size to an integer number of pixels, so round the
+       // tl-br rectangle accordingly - otherwise we see the jittering described in bug 2152666
+       br[0] -= (pw*(br[0]-tl[0]) - round_to_int(pw*(br[0]-tl[0]))) / pw;
+       br[1] -= (ph*(br[1]-tl[1]) - round_to_int(ph*(br[1]-tl[1]))) / ph;
+
        RendDesc desc(renddesc);
        desc.clear_flags();
        //desc.set_flags(RendDesc::PX_ASPECT);