Graphics render operation mode

Since 1.23

• blend - Alpha blending onto destination (default); d = d*(1-sa) + s.
• copy - Copy source to destination; d = s.
• last - Sentinel value to indicate last enum field during iteration

enum Efl.Gfx.Render_Op {
    blend: 0,
    copy: 1,
    last
}

typedef enum {
    EFL_GFX_RENDER_OP_BLEND = 0,
    EFL_GFX_RENDER_OP_COPY = 1,
    EFL_GFX_RENDER_OP_LAST
} Efl_Gfx_Render_Op;