[gtk+] gsk: Rename set_offset() to set_anchor_point()

[Emmanuele Bassi <ebassi src gnome org>]

commit a146618de0ac975090c30b1b15c87cd9c65a0d7d
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Aug 4 15:20:06 2016 +0100

    gsk: Rename set_offset() to set_anchor_point()
    
    The naming is consistent with other scene graph libraries, as it
    represents an additional translation transformation applied on top of
    the provided transformation matrices.
    
    We can also simplify the implementation by applying the translation when
    we compute the world matrix.

 gsk/gskrendernode.c        |   18 +++++++-----------
 gsk/gskrendernode.h        |   14 +++++++-------
 gsk/gskrendernodeprivate.h |    2 +-
 gtk/gtkwidget.c            |    8 +++++---
 4 files changed, 20 insertions(+), 22 deletions(-)
---
diff --git a/gsk/gskrendernode.c b/gsk/gskrendernode.c
index 45cdd54..ecf38a2 100644
--- a/gsk/gskrendernode.c
+++ b/gsk/gskrendernode.c
@@ -178,7 +178,8 @@ gsk_render_node_init (GskRenderNode *self)
 
   graphene_matrix_init_identity (&self->transform);
   graphene_matrix_init_identity (&self->child_transform);
-  graphene_point3d_init (&self->offset, 0.f, 0.f, 0.f);
+
+  graphene_point3d_init (&self->anchor_point, 0.f, 0.f, 0.f);
 
   self->opacity = 1.0;
 
@@ -935,24 +936,17 @@ gsk_render_node_set_transform (GskRenderNode           *node,
   else
     graphene_matrix_init_from_matrix (&node->transform, transform);
 
-  graphene_matrix_translate (&node->transform, &node->offset);
-
   node->transform_set = !graphene_matrix_is_identity (&node->transform);
 }
 
 void
-gsk_render_node_set_offset (GskRenderNode            *node,
-                            const graphene_point3d_t *offset)
+gsk_render_node_set_anchor_point (GskRenderNode            *node,
+                                  const graphene_point3d_t *offset)
 {
   g_return_if_fail (GSK_IS_RENDER_NODE (node));
   g_return_if_fail (node->is_mutable);
 
-  graphene_point3d_scale (&node->offset, -1, &node->offset);
-  graphene_matrix_translate (&node->transform, &node->offset);
-  graphene_point3d_init_from_point (&node->offset, offset);
-  graphene_matrix_translate (&node->transform, &node->offset);
-
-  node->transform_set = !graphene_matrix_is_identity (&node->transform);
+  graphene_point3d_init_from_point (&node->anchor_point, offset);
 }
 
 /**
@@ -1197,6 +1191,8 @@ gsk_render_node_update_world_matrix (GskRenderNode *node,
           if (node->transform_set)
             graphene_matrix_multiply (&tmp, &node->transform, &tmp);
 
+          graphene_matrix_translate (&tmp, &node->anchor_point);
+
           graphene_matrix_multiply (&tmp, &parent->world_matrix, &node->world_matrix);
         }
 
diff --git a/gsk/gskrendernode.h b/gsk/gskrendernode.h
index 2d03b4b..ced2630 100644
--- a/gsk/gskrendernode.h
+++ b/gsk/gskrendernode.h
@@ -89,17 +89,17 @@ gboolean                gsk_render_node_contains                (GskRenderNode *
                                                                 GskRenderNode *descendant);
 
 GDK_AVAILABLE_IN_3_22
-void                    gsk_render_node_set_bounds              (GskRenderNode         *node,
-                                                                 const graphene_rect_t *bounds);
+void                    gsk_render_node_set_bounds              (GskRenderNode            *node,
+                                                                 const graphene_rect_t    *bounds);
 GDK_AVAILABLE_IN_3_22
-void                    gsk_render_node_set_transform           (GskRenderNode           *node,
-                                                                 const graphene_matrix_t *transform);
+void                    gsk_render_node_set_transform           (GskRenderNode            *node,
+                                                                 const graphene_matrix_t  *transform);
 GDK_AVAILABLE_IN_3_22
-void                    gsk_render_node_set_offset              (GskRenderNode         *node,
+void                    gsk_render_node_set_anchor_point        (GskRenderNode            *node,
                                                                  const graphene_point3d_t *offset);
 GDK_AVAILABLE_IN_3_22
-void                    gsk_render_node_set_child_transform     (GskRenderNode           *node,
-                                                                 const graphene_matrix_t *transform);
+void                    gsk_render_node_set_child_transform     (GskRenderNode            *node,
+                                                                 const graphene_matrix_t  *transform);
 GDK_AVAILABLE_IN_3_22
 void                    gsk_render_node_set_opacity             (GskRenderNode *node,
                                                                  double         opacity);
diff --git a/gsk/gskrendernodeprivate.h b/gsk/gskrendernodeprivate.h
index 3b74eb7..0dce747 100644
--- a/gsk/gskrendernodeprivate.h
+++ b/gsk/gskrendernodeprivate.h
@@ -53,7 +53,7 @@ struct _GskRenderNode
   /* Transformations applied to the node */
   graphene_matrix_t transform;
 
-  graphene_point3d_t offset;
+  graphene_point3d_t anchor_point;
 
   /* Transformations applied to the children of the node */
   graphene_matrix_t child_transform;
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 8946c35..f2f4d5a 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -15872,12 +15872,14 @@ gtk_widget_get_render_node (GtkWidget   *widget,
       gsk_render_node_set_name (tmp, str);
       gsk_render_node_set_bounds (tmp, &bounds);
       gsk_render_node_set_transform (tmp, &m);
+      gsk_render_node_set_anchor_point (tmp,
+                                        graphene_point3d_init (&p, clip.x - alloc.x,
+                                                                   clip.y - alloc.y,
+                                                                   0.f));
+
       cr = gsk_render_node_get_draw_context (tmp);
       cairo_translate (cr, alloc.x - clip.x, alloc.y - clip.y);
-      gsk_render_node_set_offset (tmp, graphene_point3d_init (&p, clip.x - alloc.x, clip.y - alloc.y, 0.f));
-
       gtk_widget_draw (widget, cr);
-
       cairo_destroy (cr);
 
       g_free (str);