AuroraMiddleware/gtk
1
0
Fork 1
mirror of https://gitlab.gnome.org/GNOME/gtk.git synced 2024-09-19 21:40:22 +00:00
Code Issues Projects Releases Wiki Activity

path builder: Handle degenerate conics

Browse Source 
Do the same we do for quads here. Also,
conics with weight 1 are just quads.
This commit is contained in:
Matthias Clasen 2023-09-16 19:04:19 -04:00
parent ca63552cf8
commit 1f3b69e7db
1 changed files with 40 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
gsk/gskpathbuilder.c
View File

@ -893,16 +893,51 @@ gsk_path_builder_conic_to (GskPathBuilder *self,
float y2,
float weight)
{
graphene_point_t p0 = self->current_point;
graphene_point_t p1 = GRAPHENE_POINT_INIT (x1, y1);
graphene_point_t p2 = GRAPHENE_POINT_INIT (x2, y2);
g_return_if_fail (self != NULL);
g_return_if_fail (weight > 0);
/* skip the conic if it collapses to a point */
if (graphene_point_equal (&self->current_point,
&GRAPHENE_POINT_INIT (x1, y1)) ||
graphene_point_equal (&GRAPHENE_POINT_INIT (x1, y1),
&GRAPHENE_POINT_INIT (x2, y2)))
if (weight == 1)
{
gsk_path_builder_quad_to (self, x1, y1, x2, y2);
return;
}
if (collinear (&p0, &p1, &p2))
{
GskBoundingBox bb;
/* We simplify degenerate quads to one or two lines
* (two lines are needed if there's a cusp).
*/
if (!gsk_bounding_box_contains_point (gsk_bounding_box_init (&bb, &p0, &p2), &p1))
{
GskCurve c;
gsk_curve_init_foreach (&c, GSK_PATH_CONIC,
(const graphene_point_t []) { p0, p1, p2 },
3, weight);
gsk_curve_get_tight_bounds (&c, &bb);
for (int i = 0; i < 4; i++)
{
graphene_point_t q;
gsk_bounding_box_get_corner (&bb, i, &q);
if (graphene_point_equal (&p0, &q) ||
graphene_point_equal (&p2, &q))
{
gsk_bounding_box_get_corner (&bb, (i + 2) % 4, &q);
gsk_path_builder_line_to (self, q.x, q.y);
break;
}
}
}
gsk_path_builder_line_to (self, x2, y2);
return;
}