From c747be84d97085f31782879b98d911cac4bd9c40 Mon Sep 17 00:00:00 2001
From: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
Date: Fri, 12 Jul 2019 13:56:14 -0300
Subject: [PATCH] wayland: Don't scale input and opaque regions

Leave them at surface coordinates and let MetaSurfaceActor
and MetaShapedTexture handle the interactions between buffer
and geometry scale.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/409
---
 src/compositor/meta-surface-actor.c      | 24 +++++++++++++++++-------
 src/wayland/meta-wayland-actor-surface.c | 24 ++++++++++--------------
 2 files changed, 27 insertions(+), 21 deletions(-)

diff --git a/src/compositor/meta-surface-actor.c b/src/compositor/meta-surface-actor.c
index c7256c3b8..79c621214 100644
--- a/src/compositor/meta-surface-actor.c
+++ b/src/compositor/meta-surface-actor.c
@@ -22,6 +22,7 @@
 #include "clutter/clutter.h"
 #include "compositor/meta-cullable.h"
 #include "compositor/meta-shaped-texture-private.h"
+#include "compositor/region-utils.h"
 #include "meta/meta-shaped-texture.h"
 
 typedef struct _MetaSurfaceActorPrivate
@@ -249,17 +250,26 @@ meta_surface_actor_cull_out (MetaCullable   *cullable,
 
   if (opacity == 0xff)
     {
+      cairo_region_t *scaled_opaque_region;
       cairo_region_t *opaque_region;
+      double geometry_scale;
 
       opaque_region = meta_shaped_texture_get_opaque_region (priv->texture);
 
-      if (opaque_region)
-        {
-          if (unobscured_region)
-            cairo_region_subtract (unobscured_region, opaque_region);
-          if (clip_region)
-            cairo_region_subtract (clip_region, opaque_region);
-        }
+      if (!opaque_region)
+        return;
+
+      clutter_actor_get_scale (CLUTTER_ACTOR (surface_actor),
+                               &geometry_scale,
+                               NULL);
+      scaled_opaque_region = meta_region_scale (opaque_region, geometry_scale);
+
+      if (unobscured_region)
+        cairo_region_subtract (unobscured_region, scaled_opaque_region);
+      if (clip_region)
+        cairo_region_subtract (clip_region, scaled_opaque_region);
+
+      cairo_region_destroy (scaled_opaque_region);
     }
 }
 
diff --git a/src/wayland/meta-wayland-actor-surface.c b/src/wayland/meta-wayland-actor-surface.c
index bf964dcae..15d00cd9b 100644
--- a/src/wayland/meta-wayland-actor-surface.c
+++ b/src/wayland/meta-wayland-actor-surface.c
@@ -160,13 +160,12 @@ meta_wayland_actor_surface_real_sync_actor_state (MetaWaylandActorSurface *actor
 
   if (surface->input_region)
     {
-      cairo_region_t *scaled_input_region;
+      cairo_region_t *input_region;
 
-      scaled_input_region = meta_region_scale (surface->input_region,
-                                               geometry_scale);
-      cairo_region_intersect_rectangle (scaled_input_region, &surface_rect);
-      meta_surface_actor_set_input_region (surface_actor, scaled_input_region);
-      cairo_region_destroy (scaled_input_region);
+      input_region = cairo_region_copy (surface->input_region);
+      cairo_region_intersect_rectangle (input_region, &surface_rect);
+      meta_surface_actor_set_input_region (surface_actor, input_region);
+      cairo_region_destroy (input_region);
     }
   else
     {
@@ -175,15 +174,12 @@ meta_wayland_actor_surface_real_sync_actor_state (MetaWaylandActorSurface *actor
 
   if (surface->opaque_region)
     {
-      cairo_region_t *scaled_opaque_region;
+      cairo_region_t *opaque_region;
 
-      /* Wayland surface coordinate space -> stage coordinate space */
-      scaled_opaque_region = meta_region_scale (surface->opaque_region,
-                                                geometry_scale);
-      cairo_region_intersect_rectangle (scaled_opaque_region, &surface_rect);
-      meta_surface_actor_set_opaque_region (surface_actor,
-                                            scaled_opaque_region);
-      cairo_region_destroy (scaled_opaque_region);
+      opaque_region = cairo_region_copy (surface->opaque_region);
+      cairo_region_intersect_rectangle (opaque_region, &surface_rect);
+      meta_surface_actor_set_opaque_region (surface_actor, opaque_region);
+      cairo_region_destroy (opaque_region);
     }
   else
     {