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author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-09-20 14:04:29 +0100 |
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committer | Chris Wilson <chris@chris-wilson.co.uk> | 2011-09-20 14:04:29 +0100 |
commit | da95bdfcd77c56a52e08544946786cff8a33ca1e (patch) | |
tree | fd56d0d460ecf2ec657428166145fe6f8c5061d7 /src/cairo-clip.c | |
parent | a810b012cf68ea56defd76556a7780c6d6aaaf08 (diff) | |
download | cairo-da95bdfcd77c56a52e08544946786cff8a33ca1e.tar.gz |
wrapper: transform the clip into device space
We need more than just mere translation!
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'src/cairo-clip.c')
-rw-r--r-- | src/cairo-clip.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/cairo-clip.c b/src/cairo-clip.c index 44f4e7b2d..11ba54d05 100644 --- a/src/cairo-clip.c +++ b/src/cairo-clip.c @@ -452,6 +452,113 @@ _cairo_clip_translate (cairo_clip_t *clip, int tx, int ty) return clip; } +static cairo_status_t +_cairo_path_fixed_add_box (cairo_path_fixed_t *path, + const cairo_box_t *box) +{ + cairo_status_t status; + + status = _cairo_path_fixed_move_to (path, box->p1.x, box->p1.y); + if (unlikely (status)) + return status; + + status = _cairo_path_fixed_line_to (path, box->p2.x, box->p1.y); + if (unlikely (status)) + return status; + + status = _cairo_path_fixed_line_to (path, box->p2.x, box->p2.y); + if (unlikely (status)) + return status; + + status = _cairo_path_fixed_line_to (path, box->p1.x, box->p2.y); + if (unlikely (status)) + return status; + + return _cairo_path_fixed_close_path (path); +} + +static cairo_status_t +_cairo_path_fixed_init_from_boxes (cairo_path_fixed_t *path, + const cairo_boxes_t *boxes) +{ + cairo_status_t status; + const struct _cairo_boxes_chunk *chunk; + int i; + + _cairo_path_fixed_init (path); + if (boxes->num_boxes == 0) + return CAIRO_STATUS_SUCCESS; + + for (chunk = &boxes->chunks; chunk; chunk = chunk->next) { + for (i = 0; i < chunk->count; i++) { + status = _cairo_path_fixed_add_box (path, &chunk->base[i]); + if (unlikely (status)) { + _cairo_path_fixed_fini (path); + return status; + } + } + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_clip_t * +_cairo_clip_intersect_clip_path_transformed (cairo_clip_t *clip, + const cairo_clip_path_t *clip_path, + const cairo_matrix_t *m) +{ + cairo_path_fixed_t path; + + if (clip_path->prev) + clip = _cairo_clip_intersect_clip_path_transformed (clip, + clip_path->prev, + m); + + if (_cairo_path_fixed_init_copy (&path, &clip_path->path)) + return _cairo_clip_set_all_clipped (clip); + + clip = _cairo_clip_intersect_path (clip, + &path, + clip_path->fill_rule, + clip_path->tolerance, + clip_path->antialias); + _cairo_path_fixed_fini (&path); + + return clip; +} + +cairo_clip_t * +_cairo_clip_transform (cairo_clip_t *clip, const cairo_matrix_t *m) +{ + cairo_clip_t *copy; + + if (_cairo_matrix_is_translation (m)) + return _cairo_clip_translate (clip, m->x0, m->y0); + + copy = _cairo_clip_create (); + + if (clip->num_boxes) { + cairo_path_fixed_t path; + cairo_boxes_t boxes; + + _cairo_boxes_init_for_array (&boxes, clip->boxes, clip->num_boxes); + _cairo_path_fixed_init_from_boxes (&path, &boxes); + _cairo_path_fixed_transform (&path, m); + + copy = _cairo_clip_intersect_path (copy, &path, + CAIRO_FILL_RULE_WINDING, + 0.1, + CAIRO_ANTIALIAS_DEFAULT); + + _cairo_path_fixed_fini (&path); + } + + if (clip->path) + copy = _cairo_clip_intersect_clip_path_transformed (copy, clip->path,m); + + return copy; +} + cairo_clip_t * _cairo_clip_copy_with_translation (const cairo_clip_t *clip, int tx, int ty) { |