diff options
| -rw-r--r-- | libass/ass_render.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/libass/ass_render.c b/libass/ass_render.c index fa10d245db..0524e027b8 100644 --- a/libass/ass_render.c +++ b/libass/ass_render.c @@ -45,6 +45,7 @@ #define MAX_LINES 300 #define BLUR_MAX_RADIUS 50.0 #define ROUND(x) ((int) ((x) + .5)) +#define SUBPIXEL_MASK 56 // d6 bitmask for subpixel accuracy adjustment static int last_render_id = 0; @@ -1964,12 +1965,12 @@ static int ass_render_event(ass_event_t* event, event_images_t* event_images) pen.y += delta.y * render_context.scale_y; } - shift.x = pen.x & 56; - shift.y = pen.y & 56; + shift.x = pen.x & SUBPIXEL_MASK; + shift.y = pen.y & SUBPIXEL_MASK; if (render_context.evt_type == EVENT_POSITIONED) { - shift.x += double_to_d6(x2scr_pos(render_context.pos_x)) & 56; - shift.y -= double_to_d6(y2scr_pos(render_context.pos_y)) & 56; + shift.x += double_to_d6(x2scr_pos(render_context.pos_x)) & SUBPIXEL_MASK; + shift.y -= double_to_d6(y2scr_pos(render_context.pos_y)) & SUBPIXEL_MASK; } ass_font_set_transform(render_context.font, |