대상 칼라 : destColor
원본 칼라 : srcColor
알파 단계 : alphaGrade
총 알파 단계 : ALPHA_GRADE
#define ALPHA_GRADE 255 unsigned int destColor; unsigned int srcColor; unsigned int resultColor; int alphaGrade; resultColor = (destColor * (ALPHA_GRADE - alphaGrade) + srcColor * alphaGrade) << 8;
