[MPlayer-cvslog] r26065 - trunk/libass/ass_render.c

[eugeni]

Author: eugeni
Date: Fri Feb 22 20:31:49 2008
New Revision: 26065

Log:
Better handling of behind-the-camera objects.

Every point that is behind the camera is moved to the clipping plane by
orthographic projection. It is obviously incorrect, but this is a very rare
case, and proper clipping of Bezier curves is not that easy.


Modified:
   trunk/libass/ass_render.c

Modified: trunk/libass/ass_render.c
==============================================================================
--- trunk/libass/ass_render.c	(original)
+++ trunk/libass/ass_render.c	Fri Feb 22 20:31:49 2008
@@ -1623,6 +1623,7 @@ static inline void transform_point_3d(do
  */
 static inline void transform_vector_3d(FT_Vector* v, double *m) {
 	const double camera = 2500 * frame_context.border_scale; // camera distance
+	const double cutoff_z = 10.;
 	double a[4], b[4];
 	a[0] = d6_to_double(v->x);
 	a[1] = d6_to_double(v->y);
@@ -1641,8 +1642,8 @@ static inline void transform_vector_3d(F
 	b[0] *= camera;
 	b[1] *= camera;
 	b[3] = 8 * b[2] + camera;
-	if (b[3] < 0.001 && b[3] > -0.001)
-		b[3] = b[3] < 0. ? -0.001 : 0.001;
+	if (b[3] < cutoff_z)
+		b[3] = cutoff_z;
 	v->x = double_to_d6(b[0] / b[3]);
 	v->y = double_to_d6(b[1] / b[3]);
 }