order_rgba
typedef blender_rgba<rgba8, order_rgba> blender_rgba32; //----blender_rgba32
typedef blender_rgba_pre<rgba8, order_rgba> blender_rgba32_pre; //----blender_rgba32_pre
typedef blender_rgba_plain<rgba8, order_rgba> blender_rgba32_plain; //----blender_rgba32_plain
typedef blender_rgba<rgba16, order_rgba> blender_rgba64; //----blender_rgba64
typedef blender_rgba_pre<rgba16, order_rgba> blender_rgba64_pre; //----blender_rgba64_pre