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snapshot: Add gsk_snapshot_append_conic_gradient()

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This commit is contained in:
Benjamin Otte 2020-12-03 01:15:53 +01:00
parent 55a242bd81
commit 8706d69e60
3 changed files with 68 additions and 0 deletions
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1
docs/reference/gtk/gtk4-sections.txt
View File

@ -4329,6 +4329,7 @@ gtk_snapshot_append_color
gtk_snapshot_append_layout
gtk_snapshot_append_linear_gradient
gtk_snapshot_append_repeating_linear_gradient
gtk_snapshot_append_conic_gradient
gtk_snapshot_append_border
gtk_snapshot_append_inset_shadow
gtk_snapshot_append_outset_shadow

60
gtk/gtksnapshot.c
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@ -2249,6 +2249,66 @@ gtk_snapshot_append_repeating_linear_gradient (GtkSnapshot *snapshot,
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_conic_gradient:
* @snapshot: a #GtkSnapshot
* @bounds: the rectangle to render the gradient into
* @center: the center point of the conic gradient
* @rotation: the clockwise rotation in degrees of the starting angle. 0 means the
* starting angle is the top.
* @stops: (array length=n_stops): a pointer to an array of #GskColorStop defining the gradient
* @n_stops: the number of elements in @stops
*
* Appends a conic gradient node with the given stops to @snapshot.
*/
void
gtk_snapshot_append_conic_gradient (GtkSnapshot *snapshot,
const graphene_rect_t *bounds,
const graphene_point_t *center,
float rotation,
const GskColorStop *stops,
gsize n_stops)
{
GskRenderNode *node;
graphene_rect_t real_bounds;
float dx, dy;
const GdkRGBA *first_color;
gboolean need_gradient = FALSE;
int i;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (center != NULL);
g_return_if_fail (stops != NULL);
g_return_if_fail (n_stops > 1);
gtk_snapshot_ensure_translate (snapshot, &dx, &dy);
graphene_rect_offset_r (bounds, dx, dy, &real_bounds);
first_color = &stops[0].color;
for (i = 0; i < n_stops; i ++)
{
if (!gdk_rgba_equal (first_color, &stops[i].color))
{
need_gradient = TRUE;
break;
}
}
if (need_gradient)
node = gsk_conic_gradient_node_new (&real_bounds,
&GRAPHENE_POINT_INIT(
center->x + dx,
center->y + dy
),
rotation,
stops,
n_stops);
else
node = gsk_color_node_new (first_color, &real_bounds);
gtk_snapshot_append_node_internal (snapshot, node);
}
/**
* gtk_snapshot_append_radial_gradient:
* @snapshot: a #GtkSnapshot

7
gtk/gtksnapshot.h
View File

@ -191,6 +191,13 @@ void gtk_snapshot_append_repeating_radial_gradient (GtkSnapshot
const GskColorStop *stops,
gsize n_stops);
GDK_AVAILABLE_IN_ALL
void gtk_snapshot_append_conic_gradient (GtkSnapshot *snapshot,
const graphene_rect_t *bounds,
const graphene_point_t *center,
float rotation,
const GskColorStop *stops,
gsize n_stops);
GDK_AVAILABLE_IN_ALL
void gtk_snapshot_append_border (GtkSnapshot *snapshot,
const GskRoundedRect *outline,
const float border_width[4],