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path: Recompute flags in _cairo_path_fixed_scale_and_offset

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Only fill_maybe_region can change its value because the transformation
preserves vertical and horizontal lines, but can move the points and
make them integer if they were not or non-integer if they were.

Recomputing it is just as easy as checking if all the points are
integer and the path is fill_is_rectilinear.
This commit is contained in:
Andrea Canciani 2010-10-28 18:38:50 +02:00
parent 634fcf2c0a
commit 29d5b18cba
1 changed files with 9 additions and 10 deletions
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19
src/cairo-path-fixed.c
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@ -979,15 +979,8 @@ _cairo_path_fixed_offset_and_scale (cairo_path_fixed_t *path,
path->last_move_point.y = _cairo_fixed_mul (scaley, path->last_move_point.y) + offy;
path->current_point.x = _cairo_fixed_mul (scalex, path->current_point.x) + offx;
path->current_point.y = _cairo_fixed_mul (scaley, path->current_point.y) + offy;
/* Recompute an approximation of the flags.
* It might be more strict than what is actually needed.
*/
if (path->fill_maybe_region) {
path->fill_maybe_region = _cairo_fixed_is_integer (offx) &&
_cairo_fixed_is_integer (offy) &&
_cairo_fixed_is_integer (scalex) &&
_cairo_fixed_is_integer (scaley);
}
path->fill_maybe_region = TRUE;
cairo_path_foreach_buf_start (buf, path) {
for (i = 0; i < buf->num_points; i++) {
@ -998,12 +991,18 @@ _cairo_path_fixed_offset_and_scale (cairo_path_fixed_t *path,
if (scaley != CAIRO_FIXED_ONE)
buf->points[i].y = _cairo_fixed_mul (buf->points[i].y, scaley);
buf->points[i].y += offy;
if (path->fill_maybe_region) {
path->fill_maybe_region = _cairo_fixed_is_integer (buf->points[i].x) &&
_cairo_fixed_is_integer (buf->points[i].y);
}
}
} cairo_path_foreach_buf_end (buf, path);
path->fill_maybe_region &= path->fill_is_rectilinear;
path->extents.p1.x = _cairo_fixed_mul (scalex, path->extents.p1.x) + offx;
path->extents.p2.x = _cairo_fixed_mul (scalex, path->extents.p2.x) + offx;
path->extents.p1.y = _cairo_fixed_mul (scaley, path->extents.p1.y) + offy;
path->extents.p2.y = _cairo_fixed_mul (scaley, path->extents.p2.y) + offy;
}