[mutter] shaped-texture: Remove the cairo overlay (and rounded corners)

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

commit 4de492eb200caa090128259e23d41a6883cc03ad
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Apr 26 23:06:19 2012 -0400

    shaped-texture: Remove the cairo overlay (and rounded corners)
    
    As we want GTK+ to paint the mask on an A8, we can't simply use a cairo
    path. A later commit will make this into a simple masked texture, and
    meta-window-actor will be in control of the mask.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=676052

 src/compositor/meta-shaped-texture.c |  115 +-------------------------------
 src/compositor/meta-window-actor.c   |  119 ----------------------------------
 src/meta/meta-shaped-texture.h       |    3 -
 3 files changed, 4 insertions(+), 233 deletions(-)
---
diff --git a/src/compositor/meta-shaped-texture.c b/src/compositor/meta-shaped-texture.c
index ae21945..f560ac9 100644
--- a/src/compositor/meta-shaped-texture.c
+++ b/src/compositor/meta-shaped-texture.c
@@ -77,9 +77,6 @@ struct _MetaShapedTexturePrivate
   cairo_region_t *clip_region;
   cairo_region_t *shape_region;
 
-  cairo_region_t *overlay_region;
-  cairo_path_t *overlay_path;
-
   guint tex_width, tex_height;
   guint mask_width, mask_height;
 
@@ -111,8 +108,6 @@ meta_shaped_texture_init (MetaShapedTexture *self)
   priv = self->priv = META_SHAPED_TEXTURE_GET_PRIVATE (self);
 
   priv->shape_region = NULL;
-  priv->overlay_path = NULL;
-  priv->overlay_region = NULL;
   priv->paint_tower = meta_texture_tower_new ();
   priv->texture = COGL_INVALID_HANDLE;
   priv->mask_texture = COGL_INVALID_HANDLE;
@@ -149,7 +144,6 @@ meta_shaped_texture_dispose (GObject *object)
 
   meta_shaped_texture_set_shape_region (self, NULL);
   meta_shaped_texture_set_clip_region (self, NULL);
-  meta_shaped_texture_set_overlay_path (self, NULL, NULL);
 
   G_OBJECT_CLASS (meta_shaped_texture_parent_class)->dispose (object);
 }
@@ -170,59 +164,6 @@ meta_shaped_texture_dirty_mask (MetaShapedTexture *stex)
 }
 
 static void
-install_overlay_path (MetaShapedTexture *stex,
-                      guchar            *mask_data,
-                      int                tex_width,
-                      int                tex_height,
-                      int                stride)
-{
-  MetaShapedTexturePrivate *priv = stex->priv;
-  int i, n_rects;
-  cairo_t *cr;
-  cairo_rectangle_int_t rect;
-  cairo_surface_t *surface;
-
-  if (priv->overlay_region == NULL)
-    return;
-
-  surface = cairo_image_surface_create_for_data (mask_data,
-                                                 CAIRO_FORMAT_A8,
-                                                 tex_width,
-                                                 tex_height,
-                                                 stride);
-
-  cr = cairo_create (surface);
-  cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
-
-  n_rects = cairo_region_num_rectangles (priv->overlay_region);
-  for (i = 0; i < n_rects; i++)
-    {
-      cairo_region_get_rectangle (priv->overlay_region, i, &rect);
-      cairo_rectangle (cr, rect.x, rect.y, rect.width, rect.height);
-    }
-
-  cairo_fill_preserve (cr);
-  if (priv->overlay_path == NULL)
-    {
-      /* If we have an overlay region but not an overlay path, then we
-       * just need to clear the rectangles in the overlay region. */
-      goto out;
-    }
-
-  cairo_clip (cr);
-
-  cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
-  cairo_set_source_rgba (cr, 1, 1, 1, 1);
-
-  cairo_append_path (cr, priv->overlay_path);
-  cairo_fill (cr);
-
- out:
-  cairo_destroy (cr);
-  cairo_surface_destroy (surface);
-}
-
-static void
 meta_shaped_texture_ensure_mask (MetaShapedTexture *stex)
 {
   MetaShapedTexturePrivate *priv = stex->priv;
@@ -251,14 +192,10 @@ meta_shaped_texture_ensure_mask (MetaShapedTexture *stex)
       int n_rects;
       int stride;
 
-      /* If we have no shape region and no (or an empty) overlay region, we
-       * don't need to create a full mask texture, so quit early. */
-      if (priv->shape_region == NULL &&
-          (priv->overlay_region == NULL ||
-           cairo_region_num_rectangles (priv->overlay_region) == 0))
-        {
-          return;
-        }
+      /* If we have no shape region, we don't need to create
+       * a full mask texture, so quit early. */
+      if (priv->shape_region == NULL)
+        return;
 
       stride = cairo_format_stride_for_width (CAIRO_FORMAT_A8, tex_width);
 
@@ -290,8 +227,6 @@ meta_shaped_texture_ensure_mask (MetaShapedTexture *stex)
             memset (p, 255, x2 - x1);
         }
 
-      install_overlay_path (stex, mask_data, tex_width, tex_height, stride);
-
       if (meta_texture_rectangle_check (paint_tex))
         priv->mask_texture = meta_texture_rectangle_new (tex_width, tex_height,
                                                          COGL_PIXEL_FORMAT_A_8,
@@ -728,48 +663,6 @@ meta_shaped_texture_get_texture (MetaShapedTexture *stex)
 }
 
 /**
- * meta_shaped_texture_set_overlay_path:
- * @stex: a #MetaShapedTexture
- * @overlay_region: A region containing the parts of the mask to overlay.
- *   All rectangles in this region are wiped clear to full transparency,
- *   and the overlay path is clipped to this region.
- * @overlay_path: (transfer full): This path will be painted onto the mask
- *   texture with a fully opaque source. Due to the lack of refcounting
- *   in #cairo_path_t, ownership of the path is assumed.
- */
-void
-meta_shaped_texture_set_overlay_path (MetaShapedTexture *stex,
-                                      cairo_region_t    *overlay_region,
-                                      cairo_path_t      *overlay_path)
-{
-  MetaShapedTexturePrivate *priv;
-
-  g_return_if_fail (META_IS_SHAPED_TEXTURE (stex));
-
-  priv = stex->priv;
-
-  if (priv->overlay_region != NULL)
-    {
-      cairo_region_destroy (priv->overlay_region);
-      priv->overlay_region = NULL;
-    }
-
-  if (priv->overlay_path != NULL)
-    {
-      cairo_path_destroy (priv->overlay_path);
-      priv->overlay_path = NULL;
-    }
-
-  cairo_region_reference (overlay_region);
-  priv->overlay_region = overlay_region;
-
-  /* cairo_path_t does not have refcounting. */
-  priv->overlay_path = overlay_path;
-
-  meta_shaped_texture_dirty_mask (stex);
-}
-
-/**
  * meta_shaped_texture_set_clip_region:
  * @stex: a #MetaShapedTexture
  * @clip_region: (transfer full): the region of the texture that
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 0344ce8..686e3c3 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -1989,123 +1989,6 @@ meta_window_actor_sync_visibility (MetaWindowActor *self)
     }
 }
 
-static inline void
-set_integral_bounding_rect (cairo_rectangle_int_t *rect,
-                            double x, double y,
-                            double width, double height)
-{
-  rect->x = floor(x);
-  rect->y = floor(y);
-  rect->width = ceil(x + width) - rect->x;
-  rect->height = ceil(y + height) - rect->y;
-}
-
-static void
-update_corners (MetaWindowActor   *self,
-                MetaFrameBorders  *borders)
-{
-  MetaWindowActorPrivate *priv = self->priv;
-  MetaRectangle outer;
-  cairo_rectangle_int_t corner_rects[4];
-  cairo_region_t *corner_region;
-  cairo_path_t *corner_path;
-  float top_left, top_right, bottom_left, bottom_right;
-  float x, y;
-
-  /* need these to build a path */
-  cairo_t *cr;
-  cairo_surface_t *surface;
-
-  if (!priv->window->frame)
-    {
-      meta_shaped_texture_set_overlay_path (META_SHAPED_TEXTURE (priv->actor),
-                                            NULL, NULL);
-      return;
-    }
-
-  meta_window_get_outer_rect (priv->window, &outer);
-
-  meta_frame_get_corner_radiuses (priv->window->frame,
-                                  &top_left,
-                                  &top_right,
-                                  &bottom_left,
-                                  &bottom_right);
-
-  /* Unfortunately, cairo does not allow us to create a context
-   * without a surface. Create a 0x0 image surface to "paint to"
-   * so we can get the path. */
-  surface = cairo_image_surface_create (CAIRO_FORMAT_A8,
-                                        0, 0);
-
-  cr = cairo_create (surface);
-
-  /* top left */
-  x = borders->invisible.left;
-  y = borders->invisible.top;
-
-  set_integral_bounding_rect (&corner_rects[0],
-                              x, y, top_left, top_left);
-
-  cairo_arc (cr,
-             x + top_left,
-             y + top_left,
-             top_left,
-             0, M_PI*2);
-
-
-  /* top right */
-  x = borders->invisible.left + outer.width - top_right;
-  y = borders->invisible.top;
-
-  set_integral_bounding_rect (&corner_rects[1],
-                              x, y, top_right, top_right);
-
-  cairo_arc (cr,
-             x,
-             y + top_right,
-             top_right,
-             0, M_PI*2);
-
-  /* bottom right */
-  x = borders->invisible.left + outer.width - bottom_right;
-  y = borders->invisible.top + outer.height - bottom_right;
-
-  set_integral_bounding_rect (&corner_rects[2],
-                              x, y, bottom_right, bottom_right);
-
-  cairo_arc (cr,
-             x,
-             y,
-             bottom_right,
-             0, M_PI*2);
-
-  /* bottom left */
-  x = borders->invisible.left;
-  y = borders->invisible.top + outer.height - bottom_left;
-
-  set_integral_bounding_rect (&corner_rects[3],
-                              x, y, bottom_left, bottom_left);
-
-  cairo_arc (cr,
-             x + bottom_left,
-             y,
-             bottom_left,
-             0, M_PI*2);
-
-  corner_path = cairo_copy_path (cr);
-
-  cairo_surface_destroy (surface);
-  cairo_destroy (cr);
-
-  corner_region = cairo_region_create_rectangles (corner_rects, 4);
-
-  meta_shaped_texture_set_overlay_path (META_SHAPED_TEXTURE (priv->actor),
-                                        corner_region, corner_path);
-
-  cairo_region_destroy (corner_region);
-
-}
-
 static void
 check_needs_reshape (MetaWindowActor *self)
 {
@@ -2184,8 +2067,6 @@ check_needs_reshape (MetaWindowActor *self)
 
   cairo_region_destroy (region);
 
-  update_corners (self, &borders);
-
   priv->needs_reshape = FALSE;
   meta_window_actor_invalidate_shadow (self);
 }
diff --git a/src/meta/meta-shaped-texture.h b/src/meta/meta-shaped-texture.h
index b8932a6..7c8ce81 100644
--- a/src/meta/meta-shaped-texture.h
+++ b/src/meta/meta-shaped-texture.h
@@ -75,9 +75,6 @@ CoglHandle meta_shaped_texture_get_texture (MetaShapedTexture *stex);
 void meta_shaped_texture_set_shape_region (MetaShapedTexture *stex,
                                            cairo_region_t    *region);
 
-void meta_shaped_texture_set_overlay_path (MetaShapedTexture *stex,
-                                           cairo_region_t    *overlay_region,
-                                           cairo_path_t      *overlay_path);
 
 /* Assumes ownership of clip_region */
 void meta_shaped_texture_set_clip_region (MetaShapedTexture *stex,