[mutter] wayland: Move some buffer manipulation functions to meta-wayland-buffer

[Jasper St. Pierre <jstpierre src gnome org>]

commit f658740043e43340b5a92bd95022ed2cb5af8896
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Oct 7 19:48:49 2014 -0700

    wayland: Move some buffer manipulation functions to meta-wayland-buffer

 src/wayland/meta-wayland-buffer.c  |   55 ++++++++++++++++++++++++++++++++++++
 src/wayland/meta-wayland-buffer.h  |    4 ++
 src/wayland/meta-wayland-surface.c |   47 ++++++------------------------
 3 files changed, 68 insertions(+), 38 deletions(-)
---
diff --git a/src/wayland/meta-wayland-buffer.c b/src/wayland/meta-wayland-buffer.c
index 1c1e76e..40db3b0 100644
--- a/src/wayland/meta-wayland-buffer.c
+++ b/src/wayland/meta-wayland-buffer.c
@@ -26,6 +26,10 @@
 
 #include "meta-wayland-buffer.h"
 
+#include <clutter/clutter.h>
+#include <cogl/cogl-wayland-server.h>
+#include <meta/util.h>
+
 static void
 meta_wayland_buffer_destroy_handler (struct wl_listener *listener,
                                      void *data)
@@ -80,3 +84,54 @@ meta_wayland_buffer_from_resource (struct wl_resource *resource)
 
   return buffer;
 }
+
+CoglTexture *
+meta_wayland_buffer_ensure_texture (MetaWaylandBuffer *buffer)
+{
+  CoglContext *ctx = clutter_backend_get_cogl_context (clutter_get_default_backend ());
+  CoglError *catch_error = NULL;
+  CoglTexture *texture;
+
+  if (buffer->texture)
+    goto out;
+
+  texture = COGL_TEXTURE (cogl_wayland_texture_2d_new_from_buffer (ctx,
+                                                                   buffer->resource,
+                                                                   &catch_error));
+  if (!texture)
+    {
+      cogl_error_free (catch_error);
+      meta_fatal ("Could not import pending buffer, ignoring commit\n");
+    }
+
+  buffer->texture = texture;
+
+ out:
+  return buffer->texture;
+}
+
+void
+meta_wayland_buffer_process_damage (MetaWaylandBuffer *buffer,
+                                    cairo_region_t    *region)
+{
+  struct wl_shm_buffer *shm_buffer;
+
+  shm_buffer = wl_shm_buffer_get (buffer->resource);
+
+  if (shm_buffer)
+    {
+      int i, n_rectangles;
+
+      n_rectangles = cairo_region_num_rectangles (region);
+
+      for (i = 0; i < n_rectangles; i++)
+        {
+          cairo_rectangle_int_t rect;
+          cairo_region_get_rectangle (region, i, &rect);
+          cogl_wayland_texture_set_region_from_shm_buffer (buffer->texture,
+                                                           rect.x, rect.y, rect.width, rect.height,
+                                                           shm_buffer,
+                                                           rect.x, rect.y, 0, NULL);
+        }
+    }
+}
diff --git a/src/wayland/meta-wayland-buffer.h b/src/wayland/meta-wayland-buffer.h
index 1b08333..8d81c72 100644
--- a/src/wayland/meta-wayland-buffer.h
+++ b/src/wayland/meta-wayland-buffer.h
@@ -26,6 +26,7 @@
 #define META_WAYLAND_BUFFER_H
 
 #include <cogl/cogl.h>
+#include <cairo.h>
 #include <wayland-server.h>
 
 #include "meta-wayland-types.h"
@@ -43,5 +44,8 @@ struct _MetaWaylandBuffer
 MetaWaylandBuffer *     meta_wayland_buffer_from_resource       (struct wl_resource    *resource);
 void                    meta_wayland_buffer_ref                 (MetaWaylandBuffer     *buffer);
 void                    meta_wayland_buffer_unref               (MetaWaylandBuffer     *buffer);
+CoglTexture *           meta_wayland_buffer_ensure_texture      (MetaWaylandBuffer     *buffer);
+void                    meta_wayland_buffer_process_damage      (MetaWaylandBuffer     *buffer,
+                                                                 cairo_region_t        *region);
 
 #endif /* META_WAYLAND_BUFFER_H */
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index e178889..d7cc8a6 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -107,68 +107,39 @@ static void
 surface_process_damage (MetaWaylandSurface *surface,
                         cairo_region_t *region)
 {
-  int i, n_rectangles;
   cairo_rectangle_int_t buffer_rect;
   int scale = surface->scale;
-  CoglTexture *texture;
-  struct wl_shm_buffer *shm_buffer;
+  int i, n_rectangles;
 
-  /* Damage without a buffer makes no sense so ignore that, otherwise we would crash */
   if (!surface->buffer)
     return;
 
-  texture = surface->buffer->texture;
-
   buffer_rect.x = 0;
   buffer_rect.y = 0;
   buffer_rect.width = cogl_texture_get_width (surface->buffer->texture);
   buffer_rect.height = cogl_texture_get_height (surface->buffer->texture);
 
   /* The region will get destroyed after this call anyway so we can
-     just modify it here to avoid a copy */
+   * just modify it here to avoid a copy. */
   cairo_region_intersect_rectangle (region, &buffer_rect);
 
-  n_rectangles = cairo_region_num_rectangles (region);
-
-  shm_buffer = wl_shm_buffer_get (surface->buffer->resource);
+  /* First update the buffer. */
+  meta_wayland_buffer_process_damage (surface->buffer, region);
 
+  /* Now damage the actor. */
+  /* XXX: Should this be a signal / callback on MetaWaylandBuffer instead? */
+  n_rectangles = cairo_region_num_rectangles (region);
   for (i = 0; i < n_rectangles; i++)
     {
       cairo_rectangle_int_t rect;
       cairo_region_get_rectangle (region, i, &rect);
 
-      if (shm_buffer)
-        cogl_wayland_texture_set_region_from_shm_buffer (texture, rect.x, rect.y, rect.width, rect.height, 
shm_buffer, rect.x, rect.y, 0, NULL);
-
       meta_surface_actor_process_damage (surface->surface_actor,
                                          rect.x * scale, rect.y * scale, rect.width * scale, rect.height * 
scale);
     }
 }
 
 static void
-ensure_buffer_texture (MetaWaylandBuffer *buffer)
-{
-  CoglContext *ctx = clutter_backend_get_cogl_context (clutter_get_default_backend ());
-  CoglError *catch_error = NULL;
-  CoglTexture *texture;
-
-  if (buffer->texture)
-    return;
-
-  texture = COGL_TEXTURE (cogl_wayland_texture_2d_new_from_buffer (ctx,
-                                                                   buffer->resource,
-                                                                   &catch_error));
-  if (!texture)
-    {
-      cogl_error_free (catch_error);
-      meta_warning ("Could not import pending buffer, ignoring commit\n");
-      return;
-    }
-
-  buffer->texture = texture;
-}
-
-static void
 cursor_surface_commit (MetaWaylandSurface      *surface,
                        MetaWaylandPendingState *pending)
 {
@@ -426,8 +397,8 @@ commit_pending_state (MetaWaylandSurface      *surface,
 
       if (pending->buffer)
         {
-          ensure_buffer_texture (pending->buffer);
-          meta_surface_actor_wayland_set_texture (META_SURFACE_ACTOR_WAYLAND (surface->surface_actor), 
pending->buffer->texture);
+          CoglTexture *texture = meta_wayland_buffer_ensure_texture (pending->buffer);
+          meta_surface_actor_wayland_set_texture (META_SURFACE_ACTOR_WAYLAND (surface->surface_actor), 
texture);
         }
     }