cogl/pango: Drop mipmapping API/env variables

As GNOME Shell always sets that to FALSE anyways
This does not drop the separate caching whether the mipmapping is
disabled or not, in case shell wants to make use of that in the future

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3962>

clutter/clutter/clutter-context.c

@@ -31,7 +31,6 @@
 #include "clutter/clutter-paint-node-private.h"
 #include "clutter/clutter-settings-private.h"
 
-static gboolean clutter_disable_mipmap_text = FALSE;
 static gboolean clutter_show_fps = FALSE;
 static gboolean clutter_enable_accessibility = TRUE;
 
@@ -252,10 +251,6 @@ init_clutter_debug (ClutterContext *context)
   env_string = g_getenv ("CLUTTER_DISABLE_ACCESSIBILITY");
   if (env_string)
     clutter_enable_accessibility = FALSE;
-
-  env_string = g_getenv ("CLUTTER_DISABLE_MIPMAPPED_TEXT");
-  if (env_string)
-    clutter_disable_mipmap_text = TRUE;
 }
 
 ClutterContext *
@@ -312,7 +307,6 @@ clutter_context_get_pango_fontmap (ClutterContext *context)
 {
   CoglPangoFontMap *font_map;
   gdouble resolution;
-  gboolean use_mipmapping;
   ClutterBackend *backend;
   CoglContext *cogl_context;
 
@@ -326,9 +320,6 @@ clutter_context_get_pango_fontmap (ClutterContext *context)
   resolution = clutter_backend_get_resolution (context->backend);
   cogl_pango_font_map_set_resolution (font_map, resolution);
 
-  use_mipmapping = !clutter_disable_mipmap_text;
-  cogl_pango_font_map_set_use_mipmapping (font_map, use_mipmapping);
-
   context->font_map = font_map;
 
   return context->font_map;

cogl/cogl-pango/cogl-pango-fontmap.c

@@ -102,16 +102,6 @@ cogl_pango_font_map_set_resolution (CoglPangoFontMap *font_map,
   pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (font_map), dpi);
 }
 
-void
-cogl_pango_font_map_set_use_mipmapping (CoglPangoFontMap *fm,
-                                        gboolean          value)
-{
-  PangoRenderer *renderer = cogl_pango_font_map_get_renderer (fm);
-
-  _cogl_pango_renderer_set_use_mipmapping (COGL_PANGO_RENDERER (renderer),
-                                           value);
-}
-
 static GQuark
 cogl_pango_font_map_get_priv_key (void)
 {

cogl/cogl-pango/cogl-pango-private.h

@@ -42,8 +42,4 @@ G_BEGIN_DECLS
 PangoRenderer *
 _cogl_pango_renderer_new (CoglContext *context);
 
-void
-_cogl_pango_renderer_set_use_mipmapping (CoglPangoRenderer *renderer,
-                                         gboolean value);
-
 G_END_DECLS

cogl/cogl-pango/cogl-pango-render.c

@@ -223,7 +223,7 @@ _cogl_pango_renderer_constructed (GObject *gobject)
   renderer->mipmap_caches.glyph_cache =
     cogl_pango_glyph_cache_new (ctx, TRUE);
 
-  _cogl_pango_renderer_set_use_mipmapping (renderer, FALSE);
+  renderer->use_mipmapping = FALSE;
 
   if (G_OBJECT_CLASS (cogl_pango_renderer_parent_class)->constructed)
     G_OBJECT_CLASS (cogl_pango_renderer_parent_class)->constructed (gobject);
@@ -487,13 +487,6 @@ cogl_pango_show_layout_line (CoglFramebuffer        *fb,
   priv->display_list = NULL;
 }
 
-void
-_cogl_pango_renderer_set_use_mipmapping (CoglPangoRenderer *renderer,
-                                         gboolean value)
-{
-  renderer->use_mipmapping = value;
-}
-
 static CoglPangoGlyphCacheValue *
 cogl_pango_renderer_get_cached_glyph (PangoRenderer *renderer,
                                       gboolean       create,

cogl/cogl-pango/cogl-pango.h

@@ -119,18 +119,6 @@ cogl_pango_font_map_set_resolution (CoglPangoFontMap *font_map,
 COGL_EXPORT void
 cogl_pango_ensure_glyph_cache_for_layout (PangoLayout *layout);
 
-/**
- * cogl_pango_font_map_set_use_mipmapping:
- * @font_map: a #CoglPangoFontMap
- * @value: %TRUE to enable the use of mipmapping
- *
- * Sets whether the renderer for the passed font map should use
- * mipmapping when rendering a [class@Pango.Layout].
- */
-COGL_EXPORT void
-cogl_pango_font_map_set_use_mipmapping (CoglPangoFontMap *font_map,
-                                        gboolean value);
-
 /**
  * cogl_pango_font_map_get_renderer:
  * @font_map: a #CoglPangoFontMap