This removes the gl centric _cogl_texture_prepare_for_upload api from
cogl-texture.c and instead adds a _cogl_bitmap_convert_for_upload() api
which everything now uses instead. GL specific code that needed the gl
internal/format/type enums returned by _cogl_texture_prepare_for_upload
now use ->pixel_format_to_gl directly.
Since there was a special case optimization in
cogl_texture_new_from_file that aimed to avoid copying the temporary
bitmap that's created for the given file and allow conversions to
happen in-place the new _cogl_bitmap_convert_for_upload() api supports
converting in place depending on a 'can_convert_in_place' argument.
This ability to convert bitmaps in-place has been integrated across the
different components as appropriate.
In updating cogl-texture-2d-sliced.c this was able to remove a number of
other GL specific parts to how spans are setup.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit e190dd23c655da34b9c5c263a9f6006dcc0413b0)
Conflicts:
cogl/cogl-auto-texture.c
cogl/cogl.symbols
6f480c7530