[gtk/gl-linear: 17/21] Add gsk_matrix_transform_rect

[Matthias Clasen <matthiasc src gnome org>]

commit 41497aeb8b25b72c1443d63168ea18adfae72751
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 4 12:51:11 2020 -0400

    Add gsk_matrix_transform_rect
    
    This is a projecting version of the corresponding
    graphene api. While we are at it, rewrite
    gsk_matrix_transform_bounds() to use
    gsk_matrix_transform_rect().

 gsk/gsktransform.c        | 25 +++++++++++++------------
 gsk/gsktransformprivate.h |  4 +++-
 2 files changed, 16 insertions(+), 13 deletions(-)
---
diff --git a/gsk/gsktransform.c b/gsk/gsktransform.c
index 337a27ed12..2bd1bdc920 100644
--- a/gsk/gsktransform.c
+++ b/gsk/gsktransform.c
@@ -2204,13 +2204,11 @@ gsk_matrix_transform_point3d (const graphene_matrix_t  *m,
 }
 
 void
-gsk_matrix_transform_bounds (const graphene_matrix_t *m,
-                             const graphene_rect_t   *r,
-                             graphene_rect_t         *res)
+gsk_matrix_transform_rect (const graphene_matrix_t *m,
+                           const graphene_rect_t   *r,
+                           graphene_quad_t         *res)
 {
   graphene_point_t ret[4];
-  float min_x, min_y;
-  float max_x, max_y;
   graphene_rect_t rr;
 
   graphene_rect_normalize_r (r, &rr);
@@ -2233,12 +2231,15 @@ gsk_matrix_transform_bounds (const graphene_matrix_t *m,
 
 #undef TRANSFORM_POINT
 
-  /* FIXME: graphene doesn't export a fast way to do this */
-  min_x = MIN (MIN (ret[0].x, ret[1].x), MIN (ret[2].x, ret[3].x));
-  min_y = MIN (MIN (ret[0].y, ret[1].y), MIN (ret[2].y, ret[3].y));
-
-  max_x = MAX (MAX (ret[0].x, ret[1].x), MAX (ret[2].x, ret[3].x));
-  max_y = MAX (MAX (ret[0].y, ret[1].y), MAX (ret[2].y, ret[3].y));
+  graphene_quad_init (res, &ret[0], &ret[1], &ret[2], &ret[3]);
+}
+void
+gsk_matrix_transform_bounds (const graphene_matrix_t *m,
+                             const graphene_rect_t   *r,
+                             graphene_rect_t         *res)
+{
+  graphene_quad_t q;
 
-  graphene_rect_init (res, min_x, min_y, max_x - min_x, max_y - min_y);
+  gsk_matrix_transform_rect (m, r, &q);
+  graphene_quad_bounds (&q, res);
 }
diff --git a/gsk/gsktransformprivate.h b/gsk/gsktransformprivate.h
index 2c2f97448c..9f88e9a002 100644
--- a/gsk/gsktransformprivate.h
+++ b/gsk/gsktransformprivate.h
@@ -41,7 +41,9 @@ void gsk_matrix_transform_point3d (const graphene_matrix_t  *m,
 void gsk_matrix_transform_bounds  (const graphene_matrix_t  *m,
                                    const graphene_rect_t    *r,
                                    graphene_rect_t          *res);
-
+void gsk_matrix_transform_rect    (const graphene_matrix_t  *m,
+                                   const graphene_rect_t    *r,
+                                   graphene_quad_t          *res);
 
 G_END_DECLS