cogl: Drop cogl_texture_new_from_file

It is now unused.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2355>

cogl/cogl/deprecated/cogl-auto-texture.c

@@ -225,29 +225,3 @@ _cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
   return tex;
 }
 
-CoglTexture *
-cogl_texture_new_from_file (const char        *filename,
-                            CoglTextureFlags   flags,
-                            CoglPixelFormat    internal_format,
-                            GError           **error)
-{
-  CoglBitmap *bmp;
-  CoglTexture *texture = NULL;
-
-  _COGL_GET_CONTEXT (ctx, NULL);
-
-  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
-
-  bmp = cogl_bitmap_new_from_file (filename, error);
-  if (bmp == NULL)
-    return NULL;
-
-  texture = _cogl_texture_new_from_bitmap (bmp, flags,
-                                           internal_format,
-                                           TRUE, /* can convert in-place */
-                                           error);
-
-  cogl_object_unref (bmp);
-
-  return texture;
-}

cogl/cogl/deprecated/cogl-auto-texture.h

@@ -35,36 +35,6 @@ G_BEGIN_DECLS
 
 #include <cogl/cogl-texture.h>
 
-/**
- * cogl_texture_new_from_file:
- * @filename: the file to load
- * @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
- * @internal_format: the #CoglPixelFormat to use for the GPU storage of the
- *    texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
- *    format similar to the format of the source data will be used. The
- *    default blending equations of Cogl expect premultiplied color data;
- *    the main use of passing a non-premultiplied format here is if you
- *    have non-premultiplied source data and are going to adjust the blend
- *    mode (see cogl_material_set_blend()) or use the data for something
- *    other than straight blending.
- * @error: return location for a #GError or %NULL
- *
- * Creates a #CoglTexture from an image file.
- *
- * Return value: (transfer full): A newly created #CoglTexture or
- *               %NULL on failure
- *
- * Since: 0.8
- * Deprecated: 1.18: Use specific constructors such as
- *                   cogl_texture_2d_new_from_file()
- */
-COGL_DEPRECATED_FOR (cogl_texture_2d_new_from_file__OR__cogl_texture_2d_sliced_new_from_file)
-COGL_EXPORT CoglTexture *
-cogl_texture_new_from_file (const char       *filename,
-                            CoglTextureFlags   flags,
-                            CoglPixelFormat    internal_format,
-                            GError           **error);
-
 /**
  * cogl_texture_new_from_data:
  * @width: width of texture in pixels