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wrapper: intersect with target extents

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Treat the target extents as an implicit clip for computing the maximal
operation extents.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-09-17 12:00:49 +01:00
parent 242fbb010e
commit 09b42c748e
1 changed files with 33 additions and 22 deletions
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55
src/cairo-surface-wrapper.c
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@ -621,35 +621,46 @@ cairo_bool_t
_cairo_surface_wrapper_get_target_extents (cairo_surface_wrapper_t *wrapper, _cairo_surface_wrapper_get_target_extents (cairo_surface_wrapper_t *wrapper,
cairo_rectangle_int_t *extents) cairo_rectangle_int_t *extents)
{ {
cairo_rectangle_int_t tmp; cairo_rectangle_int_t clip;
cairo_bool_t has_clip;
has_clip = _cairo_surface_get_extents (wrapper->target, &clip);
if (wrapper->clip) { if (wrapper->clip) {
const cairo_rectangle_int_t *r = _cairo_clip_get_extents (wrapper->clip); if (has_clip) {
if (wrapper->needs_transform) { if (! _cairo_rectangle_intersect (&clip,
cairo_matrix_t m; _cairo_clip_get_extents (wrapper->clip)))
double x1, y1, x2, y2; return FALSE;
} else {
_cairo_surface_wrapper_get_inverse_transform (wrapper, &m); has_clip = TRUE;
clip = *_cairo_clip_get_extents (wrapper->clip);
x1 = r->x;
y1 = r->y;
x2 = r->x + r->width;
y2 = r->y + r->height;
_cairo_matrix_transform_bounding_box (&m, &x1, &y1, &x2, &y2, NULL);
tmp.x = floor (x1);
tmp.y = floor (y1);
tmp.width = ceil (x2) - tmp.x;
tmp.height = ceil (y2) - tmp.y;
r = &tmp;
} }
}
if (has_clip && wrapper->needs_transform) {
cairo_matrix_t m;
double x1, y1, x2, y2;
_cairo_surface_wrapper_get_inverse_transform (wrapper, &m);
x1 = clip.x;
y1 = clip.y;
x2 = clip.x + clip.width;
y2 = clip.y + clip.height;
_cairo_matrix_transform_bounding_box (&m, &x1, &y1, &x2, &y2, NULL);
clip.x = floor (x1);
clip.y = floor (y1);
clip.width = ceil (x2) - clip.x;
clip.height = ceil (y2) - clip.y;
}
if (has_clip) {
if (wrapper->has_extents) { if (wrapper->has_extents) {
*extents = wrapper->extents; *extents = wrapper->extents;
return _cairo_rectangle_intersect (extents, r); return _cairo_rectangle_intersect (extents, &clip);
} else { } else {
*extents = *r; *extents = clip;
return TRUE; return TRUE;
} }
} else if (wrapper->has_extents) { } else if (wrapper->has_extents) {