blender_rgb_pre
typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba8, order_rgb>, rendering_buffer> pixfmt_rgb24_pre; //----pixfmt_rgb24_pre
typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba8, order_bgr>, rendering_buffer> pixfmt_bgr24_pre; //----pixfmt_bgr24_pre
typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba16, order_rgb>, rendering_buffer> pixfmt_rgb48_pre; //----pixfmt_rgb48_pre
typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba16, order_bgr>, rendering_buffer> pixfmt_bgr48_pre; //----pixfmt_bgr48_pre