StThemeNode: split border_texture into two vars

The border_texture (and border_material) variable is being
overloaded for two purposes: it's used as a source
to 9-slice the border from, and it's used as place to prerender
the background and border together for gradients.

While we only do one or the other for any given node, the two cases
are distinct, and should use distinct variables for readability.

https://bugzilla.gnome.org/show_bug.cgi?id=636976

src/st/st-theme-node-drawing.c

@@ -633,10 +633,14 @@ _st_theme_node_free_drawing_state (StThemeNode  *node)
     cogl_handle_unref (node->background_material);
   if (node->background_shadow_material != COGL_INVALID_HANDLE)
     cogl_handle_unref (node->background_shadow_material);
-  if (node->border_texture != COGL_INVALID_HANDLE)
+  if (node->border_slices_texture != COGL_INVALID_HANDLE)
-    cogl_handle_unref (node->border_texture);
+    cogl_handle_unref (node->border_slices_texture);
-  if (node->border_material != COGL_INVALID_HANDLE)
+  if (node->border_slices_material != COGL_INVALID_HANDLE)
-    cogl_handle_unref (node->border_material);
+    cogl_handle_unref (node->border_slices_material);
+  if (node->prerendered_texture != COGL_INVALID_HANDLE)
+    cogl_handle_unref (node->prerendered_texture);
+  if (node->prerendered_material != COGL_INVALID_HANDLE)
+    cogl_handle_unref (node->prerendered_material);
   if (node->box_shadow_material != COGL_INVALID_HANDLE)
     cogl_handle_unref (node->box_shadow_material);
 
@@ -656,8 +660,10 @@ _st_theme_node_init_drawing_state (StThemeNode *node)
   node->background_material = COGL_INVALID_HANDLE;
   node->background_shadow_material = COGL_INVALID_HANDLE;
   node->box_shadow_material = COGL_INVALID_HANDLE;
-  node->border_texture = COGL_INVALID_HANDLE;
+  node->border_slices_texture = COGL_INVALID_HANDLE;
-  node->border_material = COGL_INVALID_HANDLE;
+  node->border_slices_material = COGL_INVALID_HANDLE;
+  node->prerendered_texture = COGL_INVALID_HANDLE;
+  node->prerendered_material = COGL_INVALID_HANDLE;
 
   for (corner_id = 0; corner_id < 4; corner_id++)
     node->corner_material[corner_id] = COGL_INVALID_HANDLE;
@@ -703,23 +709,31 @@ st_theme_node_render_resources (StThemeNode   *node,
 
       filename = st_border_image_get_filename (border_image);
 
-      node->border_texture = st_texture_cache_load_file_to_cogl_texture (texture_cache, filename);
+      node->border_slices_texture = st_texture_cache_load_file_to_cogl_texture (texture_cache, filename);
     }
   else if (node->background_gradient_type != ST_GRADIENT_NONE)
     {
-      node->border_texture = st_theme_node_render_gradient (node);
+      node->prerendered_texture = st_theme_node_render_gradient (node);
     }
 
-  if (node->border_texture)
+  if (node->border_slices_texture)
-    node->border_material = _st_create_texture_material (node->border_texture);
+    node->border_slices_material = _st_create_texture_material (node->border_slices_texture);
   else
-    node->border_material = COGL_INVALID_HANDLE;
+    node->border_slices_material = COGL_INVALID_HANDLE;
+
+  if (node->prerendered_texture)
+    node->prerendered_material = _st_create_texture_material (node->prerendered_texture);
+  else
+    node->prerendered_material = COGL_INVALID_HANDLE;
 
   if (box_shadow_spec)
     {
-      if (node->border_texture != COGL_INVALID_HANDLE)
+      if (node->border_slices_texture != COGL_INVALID_HANDLE)
         node->box_shadow_material = _st_create_shadow_material (box_shadow_spec,
-                                                                node->border_texture);
+                                                                node->border_slices_texture);
+      else if (node->prerendered_texture != COGL_INVALID_HANDLE)
+        node->box_shadow_material = _st_create_shadow_material (box_shadow_spec,
+                                                                node->prerendered_texture);
       else if (node->background_color.alpha > 0 ||
                node->border_width[ST_SIDE_TOP] > 0 ||
                node->border_width[ST_SIDE_LEFT] > 0 ||
@@ -1072,8 +1086,8 @@ st_theme_node_paint_sliced_border_image (StThemeNode           *node,
   st_border_image_get_borders (border_image,
                                &border_left, &border_right, &border_top, &border_bottom);
 
-  img_width = cogl_texture_get_width (node->border_texture);
+  img_width = cogl_texture_get_width (node->border_slices_texture);
-  img_height = cogl_texture_get_height (node->border_texture);
+  img_height = cogl_texture_get_height (node->border_slices_texture);
 
   tx1 = border_left / img_width;
   tx2 = (img_width - border_right) / img_width;
@@ -1088,7 +1102,7 @@ st_theme_node_paint_sliced_border_image (StThemeNode           *node,
   if (ey < 0)
     ey = border_bottom;          /* FIXME ? */
 
-  material = node->border_material;
+  material = node->border_slices_material;
   cogl_material_set_color4ub (material,
                               paint_opacity, paint_opacity, paint_opacity, paint_opacity);
 
@@ -1249,14 +1263,11 @@ st_theme_node_paint (StThemeNode           *node,
                                    &allocation,
                                    paint_opacity);
 
-  if (node->border_material != COGL_INVALID_HANDLE)
+  /* Gradients and border images are mutually exclusive at this time */
-    {
+  if (node->prerendered_material != COGL_INVALID_HANDLE)
-      /* Gradients and border images are mutually exclusive at this time */
+    paint_material_with_opacity (node->prerendered_material, &allocation, paint_opacity);
-      if (node->background_gradient_type != ST_GRADIENT_NONE)
+  else if (node->border_slices_material != COGL_INVALID_HANDLE)
-        paint_material_with_opacity (node->border_material, &allocation, paint_opacity);
+    st_theme_node_paint_sliced_border_image (node, &allocation, paint_opacity);
-      else
-        st_theme_node_paint_sliced_border_image (node, &allocation, paint_opacity);
-    }
   else
     st_theme_node_paint_borders (node, box, paint_opacity);
 
@@ -1325,10 +1336,14 @@ st_theme_node_copy_cached_paint_state (StThemeNode *node,
     node->background_texture = cogl_handle_ref (other->background_texture);
   if (other->background_material)
     node->background_material = cogl_handle_ref (other->background_material);
-  if (other->border_texture)
+  if (other->border_slices_texture)
-    node->border_texture = cogl_handle_ref (other->border_texture);
+    node->border_slices_texture = cogl_handle_ref (other->border_slices_texture);
-  if (other->border_material)
+  if (other->border_slices_material)
-    node->border_material = cogl_handle_ref (other->border_material);
+    node->border_slices_material = cogl_handle_ref (other->border_slices_material);
+  if (other->prerendered_texture)
+    node->prerendered_texture = cogl_handle_ref (other->prerendered_texture);
+  if (other->prerendered_material)
+    node->prerendered_material = cogl_handle_ref (other->prerendered_material);
   for (corner_id = 0; corner_id < 4; corner_id++)
     if (other->corner_material[corner_id])
       node->corner_material[corner_id] = cogl_handle_ref (other->corner_material[corner_id]);

src/st/st-theme-node-private.h

@@ -100,8 +100,10 @@ struct _StThemeNode {
   CoglHandle box_shadow_material;
   CoglHandle background_texture;
   CoglHandle background_material;
-  CoglHandle border_texture;
+  CoglHandle border_slices_texture;
-  CoglHandle border_material;
+  CoglHandle border_slices_material;
+  CoglHandle prerendered_texture;
+  CoglHandle prerendered_material;
   CoglHandle corner_material[4];
 };