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.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26065 b3059339-0415-0410-9bf9-f77b7e298cf2

diff --git a/libass/ass_render.c b/libass/ass_render.c
index 6b345a72477c58701eaefb8cb884ebb6e2f742fa..05657294a7ee984f9c210f5ab7aedc65c5f7e242 100644 (file)
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -1623,6 +1623,7 @@ static inline void transform_point_3d(double *a, double *m, double *b)
  */
 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(FT_Vector* v, double *m) {
        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]);
 }