Fix the projective transformation matrix used for Xrender-based scaled image drawing.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12201 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 5 insertions, 1 deletions

diff --git a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
index a7b2ec560..ed30b2e36 100644
--- a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
+++ b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver_image.cxx
@@ -828,7 +828,11 @@ int Fl_Xlib_Graphics_Driver::draw_scaled(Fl_Image *img, int XP, int YP, int WP,
   const Fl_Region clipr = fl_clip_region();
   if (clipr)
     XRenderSetPictureClipRegion(fl_display, dst, clipr);
-  XTransform mat = {rgb->w()/float(WP),0,0,0,rgb->h()/float(HP),0,0,0,1};
+  XTransform mat = {{
+    { XDoubleToFixed( rgb->w()/double(WP) ), XDoubleToFixed( 0 ), XDoubleToFixed(     0 ) },
+    { XDoubleToFixed( 0 ), XDoubleToFixed( rgb->h()/double(HP) ), XDoubleToFixed(     0 ) },
+    { XDoubleToFixed( 0 ), XDoubleToFixed( 0 ), XDoubleToFixed( 1 ) }
+  }};
   XRenderSetPictureTransform(fl_display, src, &mat);
   XRenderComposite(fl_display, rgb->d()%2==0 ? PictOpOver: PictOpSrc, src, None, dst, 0, 0, 0, 0, XP, YP, WP, HP);
   XRenderFreePicture(fl_display, src);