diff options
| -rw-r--r-- | libass/ass_bitmap.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libass/ass_bitmap.c b/libass/ass_bitmap.c index a2dc293..1f719f8 100644 --- a/libass/ass_bitmap.c +++ b/libass/ass_bitmap.c @@ -329,6 +329,7 @@ void shift_bitmap(Bitmap *bm, int shift_x, int shift_y) // Shift in x direction if (shift_x > 0) { + shift_x &= 0x3F; for (y = 0; y < h; y++) { for (x = w - 1; x > 0; x--) { b = (buf[x + y * s - 1] * shift_x) >> 6; @@ -337,7 +338,7 @@ void shift_bitmap(Bitmap *bm, int shift_x, int shift_y) } } } else if (shift_x < 0) { - shift_x = -shift_x; + shift_x = -shift_x & 0x3F; for (y = 0; y < h; y++) { for (x = 0; x < w - 1; x++) { b = (buf[x + y * s + 1] * shift_x) >> 6; @@ -349,6 +350,7 @@ void shift_bitmap(Bitmap *bm, int shift_x, int shift_y) // Shift in y direction if (shift_y > 0) { + shift_y &= 0x3F; for (x = 0; x < w; x++) { for (y = h - 1; y > 0; y--) { b = (buf[x + (y - 1) * s] * shift_y) >> 6; @@ -357,7 +359,7 @@ void shift_bitmap(Bitmap *bm, int shift_x, int shift_y) } } } else if (shift_y < 0) { - shift_y = -shift_y; + shift_y = -shift_y & 0x3F; for (x = 0; x < w; x++) { for (y = 0; y < h - 1; y++) { b = (buf[x + (y + 1) * s] * shift_y) >> 6; |