evas gl - fix leak with font glyph textures

some font glyphs are still allocated after tyhe last gl window is
freed which means we can't make current anymore to free textures after
that. this fixes that by flushing gl texture info from the font cache
when the last gl windows are gone.

@fix

src/lib/evas/common/evas_font.h

@@ -68,6 +68,7 @@ EAPI void              evas_common_font_flush                (void);
 EAPI void              evas_common_font_flush_last           (void);
 EAPI RGBA_Font_Int    *evas_common_font_int_find             (const char *name, int size, Font_Rend_Flags wanted_rend);
 EAPI void              evas_common_font_all_clear            (void);
+EAPI void              evas_common_font_ext_clear            (void);
 
 /* query */
 

src/lib/evas/common/evas_font_load.c

@@ -962,3 +962,60 @@ evas_common_font_int_find(const char *name, int size,
    eina_stringshare_del(tmp_fn.name);
    return fi;
 }
+
+static void
+_font_int_ext_clear(RGBA_Font_Int *fi)
+{
+   RGBA_Font_Glyph *fg;
+   Fash_Glyph_Map *fmap;
+   Fash_Glyph_Map2 *fash2;
+   Fash_Glyph *fash;
+   int i, j, k;
+
+   fash = fi->fash;
+   if (!fash) return;
+   for (k = 0; k <= 0xff; k++)
+     {
+        fash2 = fash->bucket[k];
+        if (fash2)
+          {
+             for (j = 0; j <= 0xff; j++)
+               {
+                  fmap = fash2->bucket[j];
+                  if (fmap)
+                    {
+                       for (i = 0; i <= 0xff; i++)
+                         {
+                            fg = fmap->item[i];
+                            if ((fg) && (fg != (void *)(-1)))
+                              {
+                                 if (fg->ext_dat)
+                                   {
+                                      if (fg->ext_dat_free)
+                                        fg->ext_dat_free(fg->ext_dat);
+                                      fg->ext_dat = NULL;
+                                      fg->ext_dat_free = NULL;
+                                   }
+                              }
+                         }
+                    }
+               }
+          }
+     }
+}
+
+static Eina_Bool
+_cb_hash_font_ext(const Eina_Hash *hash EINA_UNUSED,
+                  const void *key EINA_UNUSED,
+                  void *data EINA_UNUSED,
+                  void *fdata EINA_UNUSED)
+{
+   _font_int_ext_clear(data);
+   return EINA_TRUE;
+}
+
+EAPI void
+evas_common_font_ext_clear(void)
+{
+   eina_hash_foreach(fonts, _cb_hash_font_ext, NULL);
+}

src/modules/evas/engines/gl_cocoa/evas_gl_cocoa_main.m

@@ -111,6 +111,7 @@ eng_window_free(Evas_GL_Cocoa_Window *gw)
    if (gw == _evas_gl_cocoa_window)
      _evas_gl_cocoa_window = NULL;
 
+   evas_common_font_ext_clear();
    evas_gl_common_context_free(gw->gl_context);
    [(EvasGLView*)gw->view release];
    free(gw);

src/modules/evas/engines/gl_drm/evas_outbuf.c

@@ -394,6 +394,8 @@ evas_outbuf_free(Outbuf *ob)
    win_count--;
    evas_outbuf_use(ob);
 
+   if (win_count == 0) evas_common_font_ext_clear();
+
    if (ob == _evas_gl_drm_window) _evas_gl_drm_window = NULL;
 
    if (ob->gl_context)

src/modules/evas/engines/gl_sdl/evas_engine.c

@@ -57,6 +57,7 @@ _outbuf_free_region_for_update(Outbuf *ob EINA_UNUSED, RGBA_Image *update EINA_U
 static void
 _outbuf_free(Outbuf *ob)
 {
+   evas_common_font_ext_clear();
    glsym_evas_gl_common_context_free(ob->gl_context);
 }
 

src/modules/evas/engines/gl_x11/evas_x_main.c

@@ -587,6 +587,8 @@ eng_window_free(Outbuf *gw)
    win_count--;
    eng_window_use(gw);
 
+   if (win_count == 0) evas_common_font_ext_clear();
+
    context = _tls_context_get();
    xwin = _tls_outbuf_get();