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
This exposes cogl_sub_texture_new() and cogl_is_sub_texture() as experimental public API. Previously sub-textures were only exposed via cogl_texture_new_from_sub_texture() so there wasn't a corresponding CoglSubTexture type. A CoglSubTexture is a high-level texture defined as a sub-region of some other parent texture. CoglSubTextures are high level textures that implement the CoglMetaTexture interface which can be used to manually handle texture repeating. Reviewed-by: Neil Roberts <neil@linux.intel.com>