region: Move Region.scale to Mtk

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3501>

mtk/mtk/mtk-region.c

@@ -360,3 +360,30 @@ mtk_region_contains_rectangle (const MtkRegion    *region,
       return MTK_REGION_OVERLAP_PART;
     }
 }
+
+MtkRegion *
+mtk_region_scale (MtkRegion *region,
+                  int        scale)
+{
+  int n_rects, i;
+  MtkRectangle *rects;
+  MtkRegion *scaled_region;
+
+  if (scale == 1)
+    return mtk_region_copy (region);
+
+  n_rects = mtk_region_num_rectangles (region);
+  MTK_RECTANGLE_CREATE_ARRAY_SCOPED (n_rects, rects);
+  for (i = 0; i < n_rects; i++)
+    {
+      rects[i] = mtk_region_get_rectangle (region, i);
+      rects[i].x *= scale;
+      rects[i].y *= scale;
+      rects[i].width *= scale;
+      rects[i].height *= scale;
+    }
+
+  scaled_region = mtk_region_create_rectangles (rects, n_rects);
+
+  return scaled_region;
+}

mtk/mtk/mtk-region.h

@@ -114,4 +114,8 @@ MTK_EXPORT
 MtkRegionOverlap mtk_region_contains_rectangle (const MtkRegion    *region,
                                                 const MtkRectangle *rect);
 
+MTK_EXPORT
+MtkRegion * mtk_region_scale (MtkRegion *region,
+                              int        scale);
+
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (MtkRegion, mtk_region_unref)

src/compositor/region-utils.c

@@ -176,33 +176,6 @@ meta_region_iterator_next (MetaRegionIterator *iter)
     }
 }
 
-MtkRegion *
-meta_region_scale (MtkRegion *region,
-                   int        scale)
-{
-  int n_rects, i;
-  MtkRectangle *rects;
-  MtkRegion *scaled_region;
-
-  if (scale == 1)
-    return mtk_region_copy (region);
-
-  n_rects = mtk_region_num_rectangles (region);
-  MTK_RECTANGLE_CREATE_ARRAY_SCOPED (n_rects, rects);
-  for (i = 0; i < n_rects; i++)
-    {
-      rects[i] = mtk_region_get_rectangle (region, i);
-      rects[i].x *= scale;
-      rects[i].y *= scale;
-      rects[i].width *= scale;
-      rects[i].height *= scale;
-    }
-
-  scaled_region = mtk_region_create_rectangles (rects, n_rects);
-
-  return scaled_region;
-}
-
 static void
 add_expanded_rect (MetaRegionBuilder  *builder,
                    int                 x,

src/compositor/region-utils.h

@@ -92,9 +92,6 @@ void     meta_region_iterator_init      (MetaRegionIterator *iter,
 gboolean meta_region_iterator_at_end    (MetaRegionIterator *iter);
 void     meta_region_iterator_next      (MetaRegionIterator *iter);
 
-MtkRegion * meta_region_scale (MtkRegion *region,
-                               int        scale);
-
 MtkRegion * meta_make_border_region (MtkRegion *region,
                                      int        x_amount,
                                      int        y_amount,

src/wayland/meta-pointer-confinement-wayland.c

@@ -240,7 +240,7 @@ meta_pointer_confinement_wayland_create_constraint (MetaPointerConfinementWaylan
     {
       g_autoptr (MtkRegion) scaled_region = NULL;
 
-      scaled_region = meta_region_scale (region, geometry_scale);
+      scaled_region = mtk_region_scale (region, geometry_scale);
       g_clear_pointer (&region, mtk_region_unref);
       region = g_steal_pointer (&scaled_region);
     }

src/wayland/meta-wayland-surface.c

@@ -335,7 +335,7 @@ surface_process_damage (MetaWaylandSurface *surface,
                                                     &src_rect,
                                                     surface_rect.width,
                                                     surface_rect.height);
-      scaled_region = meta_region_scale (viewport_region, surface_scale);
+      scaled_region = mtk_region_scale (viewport_region, surface_scale);
       transformed_region = meta_region_transform (scaled_region,
                                                   surface->buffer_transform,
                                                   buffer_rect.width,