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[cairo-path-fixed] Ensure the points array is naturally aligned, take 2.

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By enlarging buf_size to ensure the correct alignment of the points
array with the cairo_path_buf_t block, we can efficiently use the
padding bytes to store more ops.
This commit is contained in:
Chris Wilson 2007-12-27 12:46:13 +00:00
parent d8169b8cef
commit e0187ad49b
1 changed files with 6 additions and 6 deletions
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12
src/cairo-path-fixed.c
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@ -404,12 +404,13 @@ _cairo_path_buf_create (int buf_size)
{
cairo_path_buf_t *buf;
#define align(ptr__, alignment__) \
((void *) (((long) (ptr__) + (alignment__) - 1) & -(alignment__)))
/* adjust buf_size to ensure that buf->points is naturally aligned */
buf_size += sizeof (double)
- ((buf_size + sizeof (cairo_path_buf_t)) & (sizeof (double)-1));
buf = _cairo_malloc_ab_plus_c (buf_size,
sizeof (cairo_path_op_t) +
2 * sizeof (cairo_point_t),
sizeof (cairo_path_buf_t) + sizeof (double));
sizeof (cairo_path_buf_t));
if (buf) {
buf->next = NULL;
buf->prev = NULL;
@ -417,10 +418,9 @@ _cairo_path_buf_create (int buf_size)
buf->num_points = 0;
buf->buf_size = buf_size;
buf->points = (cairo_point_t *) align (buf + 1, sizeof (double));
buf->op = (cairo_path_op_t *) (buf->points + 2 * buf_size);
buf->op = (cairo_path_op_t *) (buf + 1);
buf->points = (cairo_point_t *) (buf->op + buf_size);
}
#undef align
return buf;
}