rga 格式转换到buffer指定位置

#define imcvtcolorEX(src, dst, sfmt, dfmt, nposX,nposY, ...) \
    ({ \
        IM_STATUS ret = IM_STATUS_SUCCESS; \
        int args[] = {__VA_ARGS__}; \
        int argc = sizeof(args)/sizeof(int); \
        if (argc == 0) { \
            ret = imcvtcolorEX_t(src, dst, sfmt, dfmt, nposX,nposY,IM_COLOR_SPACE_DEFAULT, 1); \
        } else if (argc == 1){ \
            ret = imcvtcolorEX_t(src, dst, sfmt, dfmt, nposX,nposY, args[0], 1); \
        } else if (argc == 2){ \
            ret = imcvtcolorEX_t(src, dst, sfmt, dfmt, nposX,nposY, args[0], args[1]); \
        } else { \
            ret = IM_STATUS_INVALID_PARAM; \
            printf("invalid parameter\n"); \
        } \
        ret; \
    })

IM_API IM_STATUS imcvtcolorEX_t(rga_buffer_t src, rga_buffer_t dst, int sfmt, int dfmt, int nposX,int nposY, int mode, int sync);

IM_API IM_STATUS imcvtcolorEX_t(rga_buffer_t src, rga_buffer_t dst, int sfmt, int dfmt, int nposX,int nposY, int mode, int syn