[gtk/curve-ops: 6/10] Add gsk_curve_get_bounds

[Matthias Clasen <matthiasc src gnome org>]

commit 807d68ca5b9668540d80948741dc8f22837bd229
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 7 01:22:39 2020 -0500

    Add gsk_curve_get_bounds
    
    A cheaper bounding box.

 gsk/gskcurve.c        | 37 +++++++++++++++++++++++++++++++++++++
 gsk/gskcurveprivate.h |  3 ++-
 2 files changed, 39 insertions(+), 1 deletion(-)
---
diff --git a/gsk/gskcurve.c b/gsk/gskcurve.c
index 3d5f3e2397..1523f07362 100644
--- a/gsk/gskcurve.c
+++ b/gsk/gskcurve.c
@@ -48,6 +48,8 @@ struct _GskCurveClass
                                                          graphene_vec2_t        *tangent);
   void                          (* get_end_tangent)     (const GskCurve         *curve,
                                                          graphene_vec2_t        *tangent);
+  void                          (* get_bounds)          (const GskCurve         *curve,
+                                                         graphene_rect_t        *bounds);
   void                          (* get_tight_bounds)    (const GskCurve         *curve,
                                                          graphene_rect_t        *bounds);
 };
@@ -183,6 +185,7 @@ static const GskCurveClass GSK_LINE_CURVE_CLASS = {
   gsk_line_curve_get_end_point,
   gsk_line_curve_get_tangent,
   gsk_line_curve_get_tangent,
+  gsk_line_curve_get_bounds,
   gsk_line_curve_get_bounds
 };
 
@@ -366,6 +369,19 @@ gsk_curve_curve_get_end_tangent (const GskCurve  *curve,
   return get_tangent (&self->points[2], &self->points[3], tangent);
 }
 
+static void
+gsk_curve_curve_get_bounds (const GskCurve  *curve,
+                            graphene_rect_t *bounds)
+{
+  const GskCurveCurve *self = &curve->curve;
+  const graphene_point_t *pts = self->points;
+
+  graphene_rect_init (bounds, pts[0].x, pts[0].y, 0, 0);
+  graphene_rect_expand (bounds, &pts[1], bounds);
+  graphene_rect_expand (bounds, &pts[2], bounds);
+  graphene_rect_expand (bounds, &pts[3], bounds);
+}
+
 static inline gboolean
 acceptable (float t)
 {
@@ -450,6 +466,7 @@ static const GskCurveClass GSK_CURVE_CURVE_CLASS = {
   gsk_curve_curve_get_end_point,
   gsk_curve_curve_get_start_tangent,
   gsk_curve_curve_get_end_tangent,
+  gsk_curve_curve_get_bounds,
   gsk_curve_curve_get_tight_bounds
 };
 
@@ -682,6 +699,18 @@ gsk_conic_curve_get_end_tangent (const GskCurve  *curve,
   return get_tangent (&self->points[1], &self->points[3], tangent);
 }
 
+static void
+gsk_conic_curve_get_bounds (const GskCurve  *curve,
+                            graphene_rect_t *bounds)
+{
+  const GskCurveCurve *self = &curve->curve;
+  const graphene_point_t *pts = self->points;
+
+  graphene_rect_init (bounds, pts[0].x, pts[0].y, 0, 0);
+  graphene_rect_expand (bounds, &pts[1], bounds);
+  graphene_rect_expand (bounds, &pts[3], bounds);
+}
+
 /* Solve N = 0 where N is the numerator of (P/Q)', with
  * P = (1-t)^2*a + 2*t*(1-t)*w*b + t^2*c
  * Q = (1-t)^2 + 2*t*(1-t)*w + t^2
@@ -758,6 +787,7 @@ static const GskCurveClass GSK_CONIC_CURVE_CLASS = {
   gsk_conic_curve_get_end_point,
   gsk_conic_curve_get_start_tangent,
   gsk_conic_curve_get_end_tangent,
+  gsk_conic_curve_get_bounds,
   gsk_conic_curve_get_tight_bounds
 };
 
@@ -844,6 +874,13 @@ gsk_curve_get_end_tangent (const GskCurve  *curve,
   get_class (curve->op)->get_end_tangent (curve, tangent);
 }
 
+void
+gsk_curve_get_bounds (const GskCurve  *curve,
+                      graphene_rect_t *bounds)
+{
+  get_class (curve->op)->get_bounds (curve, bounds);
+}
+
 void
 gsk_curve_get_tight_bounds (const GskCurve  *curve,
                             graphene_rect_t *bounds)
diff --git a/gsk/gskcurveprivate.h b/gsk/gskcurveprivate.h
index a64e8ce736..838841ad68 100644
--- a/gsk/gskcurveprivate.h
+++ b/gsk/gskcurveprivate.h
@@ -102,7 +102,8 @@ void                    gsk_curve_get_start_tangent             (const GskCurve
                                                                  graphene_vec2_t        *tangent);
 void                    gsk_curve_get_end_tangent               (const GskCurve         *curve,
                                                                  graphene_vec2_t        *tangent);
-
+void                    gsk_curve_get_bounds                    (const GskCurve         *curve,
+                                                                 graphene_rect_t        *bounds);
 void                    gsk_curve_get_tight_bounds              (const GskCurve         *curve,
                                                                  graphene_rect_t        *bounds);