Enum BLEND_MODE 

#[repr(i32)]
pub enum BLEND_MODE {
    NONE = 0,
    ADD = 1,
    SUB = 2,
    MUL = 3,
    SCREEN = 4,
    OVERLAY = 5,
    LIGHT = 6,
    DARK = 7,
    BRIGHTNESS = 8,
    CHROMA = 9,
    SHADOW = 10,
    LIGHT_DARK = 11,
    DIFF = 12,
}

合成モードの種別

Variants

NONE = 0

通常

ADD = 1

加算

SUB = 2

減算

MUL = 3

乗算

SCREEN = 4

スクリーン

OVERLAY = 5

オーバーレイ

LIGHT = 6

比較（明）

DARK = 7

比較（暗）

BRIGHTNESS = 8

輝度

CHROMA = 9

色差

SHADOW = 10

陰影

LIGHT_DARK = 11

明暗

DIFF = 12

差分